Ecological Engineering最新文献_第5页

Flow-driven regulation of phosphorus retention and release in artificial ditch mesocosm 人工沟渠生态系统磷保留与释放的流动驱动调控

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-11-15 DOI: 10.1016/j.ecoleng.2025.107856

Jiahui Xu , Mengqi Li , Hao Chen , Yongqiu Xia , Xiaohan Li , Weihua Su , Shenqiang Wang , Yu Wang

Ditches function as vital biogeochemical buffers that mediate phosphorus (P) transport from agricultural landscapes to downstream water bodies. However, their capacity to retain or release P is highly sensitive to hydrodynamic forces, particularly flow velocity. In this study, we employed a controlled ditch mesocosm to investigate the effects of contrasting flow velocities (V3: 3 cm s⁻¹; V10: 10 cm s⁻¹) on P dynamics. Total P (TP) concentrations in the water column declined under both treatments, with the maximum TP removal rate reaching 209 μmol P m⁻² h⁻¹ at 12 h under V3, compared to 184 μmol P m⁻² h⁻¹ under V10. Particulate P (PP) behavior exhibited flow-dependence: sedimentation dominated under V3, while V10 induced sediment resuspension and elevated PP concentrations. High flow conditions also stimulated alkaline phosphatase (ALP) activity and microbial diversity in suspended particulate matter (SPM), accelerating organic P (OP) mineralization. Diffusive P flux across the sediment–water interface was significantly greater under V10 (0.58 pg s⁻¹ cm⁻²) than V3 (0.38 pg s⁻¹ cm⁻²), driven by shear stress and redox fluctuations. Sediment-derived P resuspension increased nearly ninefold under V10 (7.54 mg m⁻² h⁻¹) relative to V3 (0.88 mg m⁻² h⁻¹). These findings demonstrate that flow velocity governs the balance between P retention and release through interacting physical and microbial processes, offering new insight into the design and management of ecologically engineered ditch systems.

沟渠作为重要的生物地球化学缓冲区，调节磷从农业景观向下游水体的运输。然而，它们保留或释放P的能力对水动力，特别是流速非常敏感。在这项研究中，我们采用了一个受控的沟渠中观来研究不同流速（V3: 3 cm s - 1; V10: 10 cm s - 1）对P动力学的影响。两种处理下水柱中总磷（TP）浓度均有所下降，V3处理下12 h的TP去除率最高可达209 μmol P m−2 h−1，而V10处理下最高可达184 μmol P m−2 h−1。颗粒P （PP）的行为表现出流动依赖性：V3条件下以沉降为主，而V10诱导沉积物再悬浮和PP浓度升高。高流量条件还刺激了悬浮颗粒物（SPM）中的碱性磷酸酶（ALP）活性和微生物多样性，加速了有机磷（OP）的矿化。在剪切应力和氧化还原波动的驱动下，V10条件下通过沉积物-水界面的扩散P通量（0.58 pg s−1 cm−2）明显大于V3条件下（0.38 pg s−1 cm−2）。相对于V3 (0.88 mg m−2 h−1)，V10下沉积物衍生的磷再悬浮增加了近9倍（7.54 mg m−2 h−1）。这些发现表明，水流速度通过相互作用的物理和微生物过程来控制磷的保留和释放之间的平衡，为生态工程沟渠系统的设计和管理提供了新的见解。

{"title":"Flow-driven regulation of phosphorus retention and release in artificial ditch mesocosm","authors":"Jiahui Xu , Mengqi Li , Hao Chen , Yongqiu Xia , Xiaohan Li , Weihua Su , Shenqiang Wang , Yu Wang","doi":"10.1016/j.ecoleng.2025.107856","DOIUrl":"10.1016/j.ecoleng.2025.107856","url":null,"abstract":"<div><div>Ditches function as vital biogeochemical buffers that mediate phosphorus (P) transport from agricultural landscapes to downstream water bodies. However, their capacity to retain or release P is highly sensitive to hydrodynamic forces, particularly flow velocity. In this study, we employed a controlled ditch mesocosm to investigate the effects of contrasting flow velocities (V3: 3 cm s<sup>−1</sup>; V10: 10 cm s<sup>−1</sup>) on P dynamics. Total P (TP) concentrations in the water column declined under both treatments, with the maximum TP removal rate reaching 209 μmol P m<sup>−2</sup> h<sup>−1</sup> at 12 h under V3, compared to 184 μmol P m<sup>−2</sup> h<sup>−1</sup> under V10. Particulate P (PP) behavior exhibited flow-dependence: sedimentation dominated under V3, while V10 induced sediment resuspension and elevated PP concentrations. High flow conditions also stimulated alkaline phosphatase (ALP) activity and microbial diversity in suspended particulate matter (SPM), accelerating organic P (OP) mineralization. Diffusive P flux across the sediment–water interface was significantly greater under V10 (0.58 pg s<sup>−1</sup> cm<sup>−2</sup>) than V3 (0.38 pg s<sup>−1</sup> cm<sup>−2</sup>), driven by shear stress and redox fluctuations. Sediment-derived P resuspension increased nearly ninefold under V10 (7.54 mg m<sup>−2</sup> h<sup>−1</sup>) relative to V3 (0.88 mg m<sup>−2</sup> h<sup>−1</sup>). These findings demonstrate that flow velocity governs the balance between P retention and release through interacting physical and microbial processes, offering new insight into the design and management of ecologically engineered ditch systems.</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107856"},"PeriodicalIF":4.1,"publicationDate":"2025-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145516762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From leaf to barrier scale: A multisource data evaluation of a spontaneous vegetative barrier to prevent potentially toxic element dispersal 从叶子到屏障尺度：一个多源数据评估自发的植物屏障，以防止潜在的有毒元素扩散

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-11-15 DOI: 10.1016/j.ecoleng.2025.107854

Lucie Calmon , Pascale Prudent , Sophie Fabre , Laurent Vassalo , Yoan Labrousse , Nicolas Montès , Isabelle Laffont-Schwob

Potentially toxic elements (PTEs) may threaten both environmental and human health due to their persistence and their potential for widespread dispersal through wind and water erosion. Phytoremediation is often evaluated for soil contamination management although vegetation barriers have been less explored to reduce airborne dispersal of PTEs.

The current study presents an approach to evaluate trapping capacity of woody species in vegetative barriers by combining field, laboratory measurements and airborne LiDAR point cloud to change scale from a single leaf to the entire vegetative barrier. To upscale leaf PTE concentration to plant and whole barrier estimation, allometric equations were used to evaluate accuracy of LiDAR HD above-ground volume estimation. This approach was tested on a spontaneous vegetative barrier surrounding PTE contaminated brownfields in Marseille (France). Although dense and overlapping shrub and tree canopies made measurements challenging, strong correlations were found between both methods (R² = 0.93 and 0.82 for Pinus halepensis and Pistacia lentiscus, respectively). Although PTE concentrations (As, Cd, Cu, Pb, Sb, Zn) in leaves were relatively low compared to those in soils (203 to 6592 times lower), the fraction attributed to atmospheric deposition represented a significant portion of leaf contamination, accounting for 22 % of total Pb and 44 % of total Sb. Similar efficiencies in trapping PTEs were observed between P. halepensis and P. lentiscus. The vegetative barrier, as a whole, can be considered as efficient to restrict contaminated particle dispersal in the studied context. This study underscores the accuracy of combining diverse data sources for robust assessment of nature-based solutions to mitigate contamination, moving beyond leaf-level trapping to a comprehensive barrier-scale evaluation.

潜在有毒元素（pte）由于其持久性和通过风蚀和水蚀广泛扩散的潜力，可能威胁环境和人类健康。植物修复通常被评价为土壤污染管理，尽管较少探索植被屏障以减少pte的空气传播。本研究提出了一种将野外、实验室测量和机载激光雷达点云相结合的方法，将尺度从单片树叶转变为整个植被屏障，以评估植被屏障中木本物种的捕获能力。为了将叶片PTE浓度提高到植物和整个屏障的估计水平，采用异速生长方程对LiDAR HD地上体积估计的精度进行了评估。该方法在法国马赛被PTE污染的棕地周围的自发植物屏障上进行了测试。尽管密集和重叠的灌木和乔木冠层给测量带来了挑战，但两种方法之间存在很强的相关性（对于halepensis和Pistacia lentiscus， R2分别为0.93和0.82）。虽然叶片中的PTE浓度（As、Cd、Cu、Pb、Sb、Zn）相对较低（低203 ~ 6592倍），但大气沉降占叶片污染的很大一部分，占总Pb的22%和总Sb的44%。在halepensis和lentiscus之间观察到相似的捕获PTE的效率。植物屏障作为一个整体，可以被认为是有效地限制污染颗粒在研究环境中的扩散。这项研究强调了结合不同数据源对基于自然的解决方案进行可靠评估的准确性，以减轻污染，从叶子水平的捕获到全面的屏障尺度评估。

{"title":"From leaf to barrier scale: A multisource data evaluation of a spontaneous vegetative barrier to prevent potentially toxic element dispersal","authors":"Lucie Calmon , Pascale Prudent , Sophie Fabre , Laurent Vassalo , Yoan Labrousse , Nicolas Montès , Isabelle Laffont-Schwob","doi":"10.1016/j.ecoleng.2025.107854","DOIUrl":"10.1016/j.ecoleng.2025.107854","url":null,"abstract":"<div><div>Potentially toxic elements (PTEs) may threaten both environmental and human health due to their persistence and their potential for widespread dispersal through wind and water erosion. Phytoremediation is often evaluated for soil contamination management although vegetation barriers have been less explored to reduce airborne dispersal of PTEs.</div><div>The current study presents an approach to evaluate trapping capacity of woody species in vegetative barriers by combining field, laboratory measurements and airborne LiDAR point cloud to change scale from a single leaf to the entire vegetative barrier. To upscale leaf PTE concentration to plant and whole barrier estimation, allometric equations were used to evaluate accuracy of LiDAR HD above-ground volume estimation. This approach was tested on a spontaneous vegetative barrier surrounding PTE contaminated brownfields in Marseille (France). Although dense and overlapping shrub and tree canopies made measurements challenging, strong correlations were found between both methods (R<sup>2</sup> = 0.93 and 0.82 for <em>Pinus halepensis</em> and <em>Pistacia lentiscus</em>, respectively). Although PTE concentrations (As, Cd, Cu, Pb, Sb, Zn) in leaves were relatively low compared to those in soils (203 to 6592 times lower), the fraction attributed to atmospheric deposition represented a significant portion of leaf contamination, accounting for 22 % of total Pb and 44 % of total Sb. Similar efficiencies in trapping PTEs were observed between <em>P. halepensis</em> and <em>P. lentiscus.</em> The vegetative barrier, as a whole, can be considered as efficient to restrict contaminated particle dispersal in the studied context. This study underscores the accuracy of combining diverse data sources for robust assessment of nature-based solutions to mitigate contamination, moving beyond leaf-level trapping to a comprehensive barrier-scale evaluation.</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107854"},"PeriodicalIF":4.1,"publicationDate":"2025-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145516903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced treatment and algal suppression of floating constructed wetland integrated with artificial fiber and aeration 人工纤维与曝气相结合的浮式人工湿地强化处理及抑藻效果研究

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-11-15 DOI: 10.1016/j.ecoleng.2025.107853

Yaoping Chen , Jiahao Sun , Lina Zhang , Xiaoyang Chen , Yanfei Xu , Yongchun Chen , Lee-Hyung Kim , Youngchul Kim

Considering the stagnant hydrodynamics and limited oxygen transfer characteristic of isolated or partially isolated aquatic systems, as well as the low oxygen flux and inadequate microbial attachment surfaces in traditional floating wetlands, three configurations of floating constructed wetlands were developed: (1) plant-only system, (2) plant-fiber matrix system, and (3) plant-fiber-aeration integrated system. The plant–fiber–aeration integrated system exhibited superior removal efficiencies for BOD₅ (67.4 %), TN (70.7 %), and TP (61.7 %) compared to the plant-based and plant–fiber matrix systems at the reactive equilibrium. Despite of the influent fluctuation and seasonal change, the integrated system consistently maintained better effluent quality and highest pollutant removal rate. Furthermore, aeration significantly reduced turbidity and chlorophyll-a concentrations. After treatment with the integrated system, turbidity decreased from 35.3 NTU to 8.7 NTU, and chlorophyll-a removal reached 69.6 %. Therefore, the integration of fibers and aeration offers a sustainable and cost-effective approach to addressing the limitations of traditional floating constructed wetlands, enhancing pollutant removal capacity and supporting long-term system stability.

考虑到孤立或部分孤立的水生系统流体动力学停滞和氧传递受限的特点，以及传统漂浮湿地氧通量低、微生物附着面不足的特点，开发了3种漂浮人工湿地配置：(1)纯植物系统，(2)植物-纤维基质系统，(3)植物-纤维-曝气一体化系统。在反应平衡下，与植物基和植物纤维基质系统相比，植物-纤维-曝气集成系统对BOD₅（67.4%），TN（70.7%）和TP（61.7%）的去除效率更高。尽管有流量波动和季节变化，综合系统始终保持较好的出水水质和最高的污染物去除率。此外，曝气显著降低了浊度和叶绿素-a浓度。经综合系统处理后，浊度由35.3 NTU降至8.7 NTU，叶绿素-a去除率达69.6%。因此，纤维和曝气的结合为解决传统浮式人工湿地的局限性、增强污染物去除能力和支持系统的长期稳定性提供了一种可持续和经济的方法。

{"title":"Enhanced treatment and algal suppression of floating constructed wetland integrated with artificial fiber and aeration","authors":"Yaoping Chen , Jiahao Sun , Lina Zhang , Xiaoyang Chen , Yanfei Xu , Yongchun Chen , Lee-Hyung Kim , Youngchul Kim","doi":"10.1016/j.ecoleng.2025.107853","DOIUrl":"10.1016/j.ecoleng.2025.107853","url":null,"abstract":"<div><div>Considering the stagnant hydrodynamics and limited oxygen transfer characteristic of isolated or partially isolated aquatic systems, as well as the low oxygen flux and inadequate microbial attachment surfaces in traditional floating wetlands, three configurations of floating constructed wetlands were developed: (1) plant-only system, (2) plant-fiber matrix system, and (3) plant-fiber-aeration integrated system. The plant–fiber–aeration integrated system exhibited superior removal efficiencies for BOD₅ (67.4 %), TN (70.7 %), and TP (61.7 %) compared to the plant-based and plant–fiber matrix systems at the reactive equilibrium. Despite of the influent fluctuation and seasonal change, the integrated system consistently maintained better effluent quality and highest pollutant removal rate. Furthermore, aeration significantly reduced turbidity and chlorophyll-a concentrations. After treatment with the integrated system, turbidity decreased from 35.3 NTU to 8.7 NTU, and chlorophyll-a removal reached 69.6 %. Therefore, the integration of fibers and aeration offers a sustainable and cost-effective approach to addressing the limitations of traditional floating constructed wetlands, enhancing pollutant removal capacity and supporting long-term system stability.</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107853"},"PeriodicalIF":4.1,"publicationDate":"2025-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145516901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soil constraints and ecological restoration planning for a proposed urban garden on a reclaimed landfill in South Korea 韩国一个城市花园的土壤约束和生态恢复规划

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-11-14 DOI: 10.1016/j.ecoleng.2025.107843

Byeonggil Choi, GunHyung Kwon, Heesol Chang, Solji Lee

This study evaluated the physical and chemical properties of the soil at a planned Gyeonggi provincial garden located on a reclaimed landfill site before the garden's construction in Ansan, South Korea. To assess the soil status of Gyeonggi provincial garden for 19 soil variables, we compared it to reference urban parks and urban forests throughout Gyeonggi Province. Multivariate analysis using PERMANOVA and principal coordinate analysis (PCoA) revealed clear differences in soil properties among the three land-use types (garden, parks, and forest), with the garden soils showing significantly higher bulk density (1.38 g cm⁻³ vs. 1.20 g cm⁻³ in forests), sand content, pH (8.13 vs. 5.85 in parks), and EC, but lower porosity, organic matter(OM), total nitrogen (TN), and available phosphorus (AP)(P < 0.05). In addition, environmental vector fitting (envfit) identified six key variables (pH, EC, AP, Ca²⁺, Mg²⁺, and sand content) as primary drivers of soil variation across sites (R² > 0.3, P < 0.05). The soils at the garden site exhibited physical constraints (compaction, low porosity) and chemical limitations (alkalinity, nutrient imbalance) indicative of limited suitability for immediate planting. These results suggested the need for soil remediation strategies before garden construction, including the use of organic amendments and pH management, as well as drainage planning to address localized waterlogging.

本研究评估了韩国安山市一个规划中的京畿道花园的土壤物理和化学性质，该花园位于一个回收的垃圾填埋场，在花园建设之前。为了评价京畿道园林的土壤状况，我们将19个土壤变量与京畿道的参考城市公园和城市森林进行了比较。利用PERMANOVA和主坐标分析（PCoA）的多变量分析显示，3种土地利用类型（园林、公园和森林）土壤性质存在明显差异，园林土壤的容重（1.38 g cm−3 vs. 1.20 g cm−3）、含沙量、pH （8.13 vs. 5.85）和EC显著较高，但孔隙度、有机质（OM）、全氮（TN）和速效磷（AP）较低（P < 0.05）。此外，环境向量拟合（envfit）确定了6个关键变量（pH、EC、AP、Ca2+、Mg2+和沙粒含量）是各站点土壤变化的主要驱动因素（R2 > 0.3, P < 0.05）。园地土壤表现出物理限制（压实、低孔隙度）和化学限制（碱度、养分不平衡），表明不适合立即种植。这些结果表明，在园林建设之前需要采取土壤修复策略，包括使用有机改进剂和pH管理，以及排水规划来解决局部内涝问题。

{"title":"Soil constraints and ecological restoration planning for a proposed urban garden on a reclaimed landfill in South Korea","authors":"Byeonggil Choi, GunHyung Kwon, Heesol Chang, Solji Lee","doi":"10.1016/j.ecoleng.2025.107843","DOIUrl":"10.1016/j.ecoleng.2025.107843","url":null,"abstract":"<div><div>This study evaluated the physical and chemical properties of the soil at a planned Gyeonggi provincial garden located on a reclaimed landfill site before the garden's construction in Ansan, South Korea. To assess the soil status of Gyeonggi provincial garden for 19 soil variables, we compared it to reference urban parks and urban forests throughout Gyeonggi Province. Multivariate analysis using PERMANOVA and principal coordinate analysis (PCoA) revealed clear differences in soil properties among the three land-use types (garden, parks, and forest), with the garden soils showing significantly higher bulk density (1.38 g cm<sup>−3</sup> vs. 1.20 g cm<sup>−3</sup> in forests), sand content, pH (8.13 vs. 5.85 in parks), and EC, but lower porosity, organic matter(OM), total nitrogen (TN), and available phosphorus (AP)(<em>P</em> < 0.05). In addition, environmental vector fitting (envfit) identified six key variables (pH, EC, AP, Ca<sup>2+</sup>, Mg<sup>2+</sup>, and sand content) as primary drivers of soil variation across sites (R<sup>2</sup> > 0.3, <em>P</em> < 0.05). The soils at the garden site exhibited physical constraints (compaction, low porosity) and chemical limitations (alkalinity, nutrient imbalance) indicative of limited suitability for immediate planting. These results suggested the need for soil remediation strategies before garden construction, including the use of organic amendments and pH management, as well as drainage planning to address localized waterlogging.</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107843"},"PeriodicalIF":4.1,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145516899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Boreal peatland forestry dominated catchment iron leaching and the possibilities for mitigating it 北方泥炭地林业主导了集水区铁浸出和缓解它的可能性

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-11-12 DOI: 10.1016/j.ecoleng.2025.107849

Elina Niemelä , Petra Korhonen , Hannu Marttila , Markus Saari , Katri Kattilakoski , Heini Postila

Iron (Fe) concentrations in boreal surface waters have increased since the 1990s. This phenomenon is driven by land use, particularly in black schist, acid sulfate soil and peatland areas. This increase has impaired water quality. We developed a catchment scale approach to improve identification of areas where Fe leaching occurs. High-resolution surface runoff modelling combined with spatial sampling proved to be a good method for identifying the main Fe leaching areas. In the Jäälinjärvi catchment, Finland, spatial analysis showed that Fe leaching is linked to peatland drainage and black schist zones. Undrained peatlands areas had measurably smaller concentrations, indicating their potential to buffer Fe leaching. We also assessed Fe retention efficiency in various nature-based water treatment solutions (constructed wetland (CW), settling basin (SB), vortex settling basin (VSB) and wood bundles (WB)) and examined how water properties influence Fe processes. Fe retention was generally weak. Only 3.5 ha SB showed significant removal (total 14 %, dissolved 33 %). Weak Fe removal may be due to short retention and contact time in water treatment solutions as most Fe was in a dissolved form. Additionally, water chemistry can have a major impact in sites with a low pH (5.90–6.16), which inhibits Fe oxidation. Low redox potential (ORP < 100 mV) indicated a possible microbial reduction of Fe(III). Current water treatment solutions offer limited Fe retention under low-pH and humus-rich conditions, which highlights the importance of preventing iron leaching by minimizing land use activities such as peatland drainage.

自20世纪90年代以来，北方地表水中的铁（Fe）浓度有所增加。这种现象是由土地利用驱动的，特别是在黑片岩、酸性硫酸盐土壤和泥炭地地区。这种增长损害了水质。我们开发了一个集水区规模的方法，以提高识别区域的铁浸出发生。高分辨率地表径流模拟与空间采样相结合是确定主要铁浸出区域的好方法。在芬兰Jäälinjärvi流域，空间分析表明，铁浸出与泥炭地排水和黑片岩带有关。未排水的泥炭地地区的浓度明显较低，表明它们有缓冲铁浸出的潜力。我们还评估了各种基于自然的水处理方案（人工湿地（CW），沉降池（SB），涡沉降池（VSB）和木捆（WB））中的铁保留效率，并研究了水性质如何影响铁过程。铁的保留力一般较弱。只有3.5 ha的SB有显著的去除率（总计14%，溶解33%）。弱铁去除可能是由于在水处理溶液中停留和接触时间短，因为大多数铁以溶解形式存在。此外，在pH值较低（5.90-6.16）的环境中，水化学会对铁的氧化产生重要影响。低氧化还原电位（ORP < 100 mV）表明微生物可能还原Fe（III）。目前的水处理方案在低ph值和富含腐殖质的条件下只能保留有限的铁，这突出了通过减少泥炭地排水等土地利用活动来防止铁浸出的重要性。

{"title":"Boreal peatland forestry dominated catchment iron leaching and the possibilities for mitigating it","authors":"Elina Niemelä , Petra Korhonen , Hannu Marttila , Markus Saari , Katri Kattilakoski , Heini Postila","doi":"10.1016/j.ecoleng.2025.107849","DOIUrl":"10.1016/j.ecoleng.2025.107849","url":null,"abstract":"<div><div>Iron (Fe) concentrations in boreal surface waters have increased since the 1990s. This phenomenon is driven by land use, particularly in black schist, acid sulfate soil and peatland areas. This increase has impaired water quality. We developed a catchment scale approach to improve identification of areas where Fe leaching occurs. High-resolution surface runoff modelling combined with spatial sampling proved to be a good method for identifying the main Fe leaching areas. In the Jäälinjärvi catchment, Finland, spatial analysis showed that Fe leaching is linked to peatland drainage and black schist zones. Undrained peatlands areas had measurably smaller concentrations, indicating their potential to buffer Fe leaching. We also assessed Fe retention efficiency in various nature-based water treatment solutions (constructed wetland (CW), settling basin (SB), vortex settling basin (VSB) and wood bundles (WB)) and examined how water properties influence Fe processes. Fe retention was generally weak. Only 3.5 ha SB showed significant removal (total 14 %, dissolved 33 %). Weak Fe removal may be due to short retention and contact time in water treatment solutions as most Fe was in a dissolved form. Additionally, water chemistry can have a major impact in sites with a low pH (5.90–6.16), which inhibits Fe oxidation. Low redox potential (ORP < 100 mV) indicated a possible microbial reduction of Fe(III). Current water treatment solutions offer limited Fe retention under low-pH and humus-rich conditions, which highlights the importance of preventing iron leaching by minimizing land use activities such as peatland drainage.</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107849"},"PeriodicalIF":4.1,"publicationDate":"2025-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145516900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An explainable InVEST-XGB-LGB fusion model to inform ecosystem restoration: Deciphering long-term trade-offs and drivers of ecosystem services in the Eastern Qinghai-Tibet Plateau

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-11-08 DOI: 10.1016/j.ecoleng.2025.107846

Xuemei Bai , Wende Chen , Fei Li , Zhiyuan Bu , Qiang Dai , Junchao Dai

Research on the spatiotemporal evolution of ecosystem services (ESs) and their driving mechanisms is critical to human well-being. This study presents an integrated assessment of the spatiotemporal changes and driving mechanisms of ESs in the eastern Tibetan Plateau using an InVEST–XGBoost–LightGBM analytical framework. The research procedure is conducted as follows: Firstly, we apply the InVEST model to estimate four ES indicators—Carbon Storage (CS), Habitat Quality (HQ), Soil Conservation (SC), and Water Yield (WY). Secondly, Spearman correlation analysis is used to examine pairwise linear relationships between ESs and 14 variables across four dimensions: meteorological conditions, human disturbance, and natural environment. Finally, we integrate the XGBoost and LightGBM models to quantify the contribution of nine driving factors to five ESs (CS, HQ, SC, WY, and NPP) and compare the temporal changes in factor importance to reveal spatiotemporal dynamics in driving mechanisms. The results show that climatic factors are the dominant drivers over the 30-year period: temperature is the primary factor influencing CS, HQ, SC, and NPP, while precipitation is the main driver of WY. Our study extends the application of GBDT–SHAP methods in plateau ecosystem research and provides a scientific reference for designing local ecosystem restoration strategies.

生态系统服务功能的时空演化及其驱动机制研究对人类福祉至关重要。研究步骤如下：首先，应用InVEST模型对生态系统碳储量（carbon Storage， CS）、生境质量（Habitat Quality， HQ）、土壤保持（Soil Conservation， SC）和产水量（Water Yield， WY） 4个指标进行估算。其次，利用Spearman相关分析，在气象条件、人为干扰和自然环境四个维度上，检验了ESs与14个变量之间的两两线性关系。最后，我们结合XGBoost和LightGBM模型，量化了9个驱动因子对5个ESs （CS、HQ、SC、WY和NPP）的贡献，并比较了因子重要性的时间变化，揭示了驱动机制的时空动态。结果表明：气候因子是30年的主导驱动因子，温度是影响CS、HQ、SC和NPP的主要因素，而降水是影响WY的主要因素。本研究拓展了GBDT-SHAP方法在高原生态系统研究中的应用，为设计当地生态系统恢复策略提供了科学参考。

{"title":"An explainable InVEST-XGB-LGB fusion model to inform ecosystem restoration: Deciphering long-term trade-offs and drivers of ecosystem services in the Eastern Qinghai-Tibet Plateau","authors":"Xuemei Bai , Wende Chen , Fei Li , Zhiyuan Bu , Qiang Dai , Junchao Dai","doi":"10.1016/j.ecoleng.2025.107846","DOIUrl":"10.1016/j.ecoleng.2025.107846","url":null,"abstract":"<div><div>Research on the spatiotemporal evolution of ecosystem services (ESs) and their driving mechanisms is critical to human well-being. This study presents an integrated assessment of the spatiotemporal changes and driving mechanisms of ESs in the eastern Tibetan Plateau using an InVEST–XGBoost–LightGBM analytical framework. The research procedure is conducted as follows: Firstly, we apply the InVEST model to estimate four ES indicators—Carbon Storage (CS), Habitat Quality (HQ), Soil Conservation (SC), and Water Yield (WY). Secondly, Spearman correlation analysis is used to examine pairwise linear relationships between ESs and 14 variables across four dimensions: meteorological conditions, human disturbance, and natural environment. Finally, we integrate the XGBoost and LightGBM models to quantify the contribution of nine driving factors to five ESs (CS, HQ, SC, WY, and NPP) and compare the temporal changes in factor importance to reveal spatiotemporal dynamics in driving mechanisms. The results show that climatic factors are the dominant drivers over the 30-year period: temperature is the primary factor influencing CS, HQ, SC, and NPP, while precipitation is the main driver of WY. Our study extends the application of GBDT–SHAP methods in plateau ecosystem research and provides a scientific reference for designing local ecosystem restoration strategies.</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107846"},"PeriodicalIF":4.1,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145462692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synergistic effects of amendments and Vetiveria zizanoides on soil quality and heavy metal bioavailability in a historical mine site: A 2-year field evaluation 改良剂和香根草对历史矿区土壤质量和重金属生物有效性的协同效应：2年野外评价

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-11-08 DOI: 10.1016/j.ecoleng.2025.107847

Xiaolong Lan , Wenjie Lin , Jiaqi Li , Yin Li , Yaqi Zhao , Yili Gan , Yanlong Jia , Zengping Ning , Tangfu Xiao , Enzong Xiao

Ecological restoration is a recognized sustainable strategy for remediating mine-impacted soils. However, a critical knowledge gap exists regarding the long-term, field-validated efficacy of synergistic multi-component amendments. This two-year field study investigated the combined effects of various multi-component amendments, organic compost (O), lime with organic compost (OL), OL fortified with ferric chloride (OLF), and OL supplemented with potassium permanganate (OLP), alongside Vetiveria zizanoides (V. zizanoides) cultivation, on soil quality and multi-heavy metal (Zn, Cu, Ni, Pb, Cd, As) bioavailability in a tungsten mine wasteland. Results revealed that the rhizosphere of V. zizanoides significantly enhanced soil quality, evidenced by increased soil pH, available nitrogen and phosphorus, enzyme activities, and microbial abundance. Amendment applications further enhanced soil quality and effectively curtailed heavy metal accumulation in V. zizanoides. Notably, the OLF treatment demonstrated superior efficacy, reducing plant accumulation of As, Cd, Pb, Ni, Cu, and Zn by 66.5 %, 66.5 %, 69.4 %, 39.6 %, 52.7 %, and 72.4 %, respectively. Random forest analysis identified amendment-induced increases in soil pH, available phosphorus, acid phosphatase activity, and fungal abundance as pivotal mechanisms for mitigating heavy metal bioavailability. These findings offer crucial insights and practical guidance for optimizing ecological restoration of mine wastelands with complex heavy metal contamination.

生态恢复是公认的修复矿损土壤的可持续战略。然而，关于协同多组分修正的长期、现场验证的有效性，存在一个关键的知识缺口。本研究为期两年，研究了多种多组分改良剂、有机堆肥(O)、石灰加有机堆肥（OL）、强化氯化铁（OLF）和添加高锰酸钾（OLP）以及紫草草（V. zizanoides）种植对钨矿废弃地土壤质量和多种重金属（Zn、Cu、Ni、Pb、Cd、As）生物利用度的综合影响。结果表明：根际土壤pH值、速效氮磷、酶活性和微生物丰度显著提高了土壤质量；施用改良剂进一步提高了土壤质量，有效地抑制了紫穗草重金属的积累。黄颡鱼鱼处理的砷、镉、铅、镍、铜和锌的累积量分别降低了66.5%、66.5%、69.4%、39.6%、52.7%和72.4%。随机森林分析发现，修正引起的土壤pH值、有效磷、酸性磷酸酶活性和真菌丰度的增加是减轻重金属生物有效性的关键机制。研究结果对复杂重金属污染矿山废弃地生态修复优化具有重要的指导意义。

{"title":"Synergistic effects of amendments and Vetiveria zizanoides on soil quality and heavy metal bioavailability in a historical mine site: A 2-year field evaluation","authors":"Xiaolong Lan , Wenjie Lin , Jiaqi Li , Yin Li , Yaqi Zhao , Yili Gan , Yanlong Jia , Zengping Ning , Tangfu Xiao , Enzong Xiao","doi":"10.1016/j.ecoleng.2025.107847","DOIUrl":"10.1016/j.ecoleng.2025.107847","url":null,"abstract":"<div><div>Ecological restoration is a recognized sustainable strategy for remediating mine-impacted soils. However, a critical knowledge gap exists regarding the long-term, field-validated efficacy of synergistic multi-component amendments. This two-year field study investigated the combined effects of various multi-component amendments, organic compost (O), lime with organic compost (OL), OL fortified with ferric chloride (OLF), and OL supplemented with potassium permanganate (OLP), alongside <em>Vetiveria zizanoides</em> (<em>V. zizanoides</em>) cultivation, on soil quality and multi-heavy metal (Zn, Cu, Ni, Pb, Cd, As) bioavailability in a tungsten mine wasteland. Results revealed that the rhizosphere of <em>V. zizanoides</em> significantly enhanced soil quality, evidenced by increased soil pH, available nitrogen and phosphorus, enzyme activities, and microbial abundance. Amendment applications further enhanced soil quality and effectively curtailed heavy metal accumulation in <em>V. zizanoides</em>. Notably, the OLF treatment demonstrated superior efficacy, reducing plant accumulation of As, Cd, Pb, Ni, Cu, and Zn by 66.5 %, 66.5 %, 69.4 %, 39.6 %, 52.7 %, and 72.4 %, respectively. Random forest analysis identified amendment-induced increases in soil pH, available phosphorus, acid phosphatase activity, and fungal abundance as pivotal mechanisms for mitigating heavy metal bioavailability. These findings offer crucial insights and practical guidance for optimizing ecological restoration of mine wastelands with complex heavy metal contamination.</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107847"},"PeriodicalIF":4.1,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145462691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Substrate-enhanced allometric growth of Phragmites australis improved tailwater purification efficiency in constructed wetlands 基质增强芦苇异速生长可提高人工湿地尾水净化效率

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-11-05 DOI: 10.1016/j.ecoleng.2025.107840

Tian Lin , Jia Niu , Weipeng Zhou , Huanlong Bai , Lihong Chen

The subtropical climate offers optimal conditions for the proliferation of wetland vegetation in vertical flow constructed wetlands (VFCWs). However, the synergistic interactions between the biomass accumulation of Phragmites australis and the efficiency of pollutant removal during advanced tailwater treatment remain inadequately elucidated. This study established two VFCWs systems (gravel-based versus zeolite-based) and developed a regional allometric growth model that integrates plant height (H), basal diameter (D), and biomass parameters. This model was coupled with organ-scale (leaves/stems) nitrogen (N) and phosphorus (P) analysis to quantify plant-substrate coupling dynamics. Key findings include: (1) P. australis biomass exhibited significant seasonal dynamics, with both aboveground and organ-specific biomass demonstrating a notable initial increase followed by a decline (P < 0.05), reaching peak values in November across both VFCWs systems. (2) there were significant substrate-dependent growth variations, with the gravel group producing substantially higher leaf biomass (P < 0.05) and significantly greater total aboveground biomass (P < 0.01) compared to the zeolite group. (3) although leaf and stem N/P concentrations displayed coordinated temporal patterns without significant inter-organ differences, biomass variability emerged as the primary factor influencing aboveground N and P accumulation. (4) quantitative analysis revealed that the gravel group achieved superior plant nutrient sequestration, with P. australis accounted for 29.1 % (N) and 24.7 % (P) of total system removal, surpassing those in the zeolite group (16.2 % N, 16.8 % P). These finding collectively indicate that neutral-pH substrates optimally facilitate both biomass accumulation and contaminant removal efficiency, thereby enhancing the long-term operational performance of VFCWs in subtropical regions. This provides essential theoretical foundations and practical engineering value for the optimized design and management of CWs in the area

垂直流人工湿地的亚热带气候为湿地植被的增殖提供了最佳条件。然而，在污水深度处理过程中，芦苇生物量积累与污染物去除效率之间的协同作用尚未得到充分的阐明。本研究建立了两种VFCWs系统（以砾石为基础和以沸石为基础），并建立了一个整合植物高度(H)、基径(D)和生物量参数的区域异速生长模型。该模型与器官尺度（叶/茎）氮(N)和磷(P)分析相结合，量化植物-基质耦合动力学。主要发现包括：(1)南胡杨生物量表现出显著的季节动态，地上生物量和各器官生物量均表现出先增加后下降的显著趋势（P < 0.05），并在11月达到峰值。(2)与沸石组相比，碎石组的叶片生物量显著高于沸石组（P < 0.05），地上总生物量显著高于沸石组（P < 0.01）。(3)虽然叶片和茎部氮磷浓度表现出协调的时间格局，但没有显著的器官间差异，生物量变异成为影响地上氮磷积累的主要因素。(4)定量分析表明，砾石组对植物养分的固存效果较好，南洋蓟占系统总去除率的29.1% (N)和24.7% (P)，超过沸石组（16.2% N, 16.8% P）。这些发现共同表明，中性ph底物最有利于生物质积累和污染物去除效率，从而提高亚热带VFCWs的长期运行性能。这为该地区水轮机的优化设计和管理提供了重要的理论依据和工程实用价值

{"title":"Substrate-enhanced allometric growth of Phragmites australis improved tailwater purification efficiency in constructed wetlands","authors":"Tian Lin , Jia Niu , Weipeng Zhou , Huanlong Bai , Lihong Chen","doi":"10.1016/j.ecoleng.2025.107840","DOIUrl":"10.1016/j.ecoleng.2025.107840","url":null,"abstract":"<div><div>The subtropical climate offers optimal conditions for the proliferation of wetland vegetation in vertical flow constructed wetlands (VFCWs). However, the synergistic interactions between the biomass accumulation of <em>Phragmites australis</em> and the efficiency of pollutant removal during advanced tailwater treatment remain inadequately elucidated. This study established two VFCWs systems (gravel-based versus zeolite-based) and developed a regional allometric growth model that integrates plant height (H), basal diameter (D), and biomass parameters. This model was coupled with organ-scale (leaves/stems) nitrogen (N) and phosphorus (P) analysis to quantify plant-substrate coupling dynamics. Key findings include: (1) <em>P. australis</em> biomass exhibited significant seasonal dynamics, with both aboveground and organ-specific biomass demonstrating a notable initial increase followed by a decline (<em>P</em> < 0.05), reaching peak values in November across both VFCWs systems. (2) there were significant substrate-dependent growth variations, with the gravel group producing substantially higher leaf biomass (<em>P</em> < 0.05) and significantly greater total aboveground biomass (<em>P</em> < 0.01) compared to the zeolite group. (3) although leaf and stem N/P concentrations displayed coordinated temporal patterns without significant inter-organ differences, biomass variability emerged as the primary factor influencing aboveground N and P accumulation. (4) quantitative analysis revealed that the gravel group achieved superior plant nutrient sequestration, with <em>P. australis</em> accounted for 29.1 % (N) and 24.7 % (P) of total system removal, surpassing those in the zeolite group (16.2 % N, 16.8 % P). These finding collectively indicate that neutral-pH substrates optimally facilitate both biomass accumulation and contaminant removal efficiency, thereby enhancing the long-term operational performance of VFCWs in subtropical regions. This provides essential theoretical foundations and practical engineering value for the optimized design and management of CWs in the area</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107840"},"PeriodicalIF":4.1,"publicationDate":"2025-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145462695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrological restoration reshapes nitrogen cycling in alpine wetlands: Contrasting denitrification and anammox responses to rewetting 水文恢复重塑高寒湿地的氮循环：对比反硝化和厌氧氨氧化对再湿润的响应

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-11-04 DOI: 10.1016/j.ecoleng.2025.107845

Niu Li , Jianqing Zhou , Chengchai Zhang , Yaoyao Tang , Ming Wu , Xuexin Shao , Peipei Cao , Youzheng Zhang , Long Zhang

Alpine wetlands serve as critical nitrogen (N) sinks, yet their stability is threatened by intensified drying–rewetting cycles under climate change. How hydrological restoration modulates coupled N loss pathways in these spatially heterogeneous systems remains unclear. In a before-after restoration experiment, we combined ¹⁵N-tracer incubations to quantify shifts in denitrification and anaerobic ammonium oxidation (anammox) across distinct hydrological zones. Rewetting sharply suppressed denitrification—reducing rates in upstream soils by up to 96 %—but enhanced anammox activity by up to 2.3-fold, with the strongest responses in hydrologically exposed upstream and downstream zones. These contrasting pathways were driven by zone-specific changes in soil moisture, salinity, and NH₄⁺ availability, alongside pronounced microbial restructuring, including increased co-occurrence network complexity and shifts in keystone taxa. Structural equation models revealed that denitrification was positively regulated by salinity and microbial composition, whereas anammox was promoted by NH₄⁺ and TC. Our results show that hydrological restoration selectively reconfigures N loss processes, favoring greenhouse gas-free anammox to sustain N removal under hydrological instability. This provides a mechanistic framework for designing zone-specific strategieses to enhance alpine wetland resilience.

高寒湿地作为重要的氮汇，其稳定性受到气候变化下干湿循环加剧的威胁。在这些空间异质性系统中，水文恢复如何调节耦合的N损失途径尚不清楚。在前后恢复实验中，我们结合15n示踪剂培养来量化不同水文带的反硝化和厌氧氨氧化（anammox）的变化。再润湿显著抑制了上游土壤中高达96%的反硝化减少率，但提高了厌氧氨氧化活性高达2.3倍，在水文暴露的上游和下游地区反应最强。这些不同的路径是由土壤湿度、盐度和NH4+有效性的区域特异性变化以及显著的微生物重构驱动的，包括共生网络复杂性的增加和关键分类群的转移。结构方程模型表明，反硝化作用受盐度和微生物组成的正调控，而厌氧氨氧化则受NH4+和TC的促进。我们的研究结果表明，水文恢复选择性地重新配置氮损失过程，有利于无温室气体厌氧氨氧化在水文不稳定的情况下维持氮的去除。这为设计区域特定策略以增强高寒湿地的恢复力提供了一个机制框架。

{"title":"Hydrological restoration reshapes nitrogen cycling in alpine wetlands: Contrasting denitrification and anammox responses to rewetting","authors":"Niu Li , Jianqing Zhou , Chengchai Zhang , Yaoyao Tang , Ming Wu , Xuexin Shao , Peipei Cao , Youzheng Zhang , Long Zhang","doi":"10.1016/j.ecoleng.2025.107845","DOIUrl":"10.1016/j.ecoleng.2025.107845","url":null,"abstract":"<div><div>Alpine wetlands serve as critical nitrogen (N) sinks, yet their stability is threatened by intensified drying–rewetting cycles under climate change. How hydrological restoration modulates coupled N loss pathways in these spatially heterogeneous systems remains unclear. In a before-after restoration experiment, we combined <sup>15</sup>N-tracer incubations to quantify shifts in denitrification and anaerobic ammonium oxidation (anammox) across distinct hydrological zones. Rewetting sharply suppressed denitrification—reducing rates in upstream soils by up to 96 %—but enhanced anammox activity by up to 2.3-fold, with the strongest responses in hydrologically exposed upstream and downstream zones. These contrasting pathways were driven by zone-specific changes in soil moisture, salinity, and NH<sub>4</sub><sup>+</sup> availability, alongside pronounced microbial restructuring, including increased co-occurrence network complexity and shifts in keystone taxa. Structural equation models revealed that denitrification was positively regulated by salinity and microbial composition, whereas anammox was promoted by NH<sub>4</sub><sup>+</sup> and TC. Our results show that hydrological restoration selectively reconfigures N loss processes, favoring greenhouse gas-free anammox to sustain N removal under hydrological instability. This provides a mechanistic framework for designing zone-specific strategieses to enhance alpine wetland resilience.</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107845"},"PeriodicalIF":4.1,"publicationDate":"2025-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145462479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nitrogen removal from farmland effluents through novel eco-ditch system: Performance and mechanism 新型生态沟系统对农田污水脱氮效果及机理研究

IF 4.1 2区环境科学与生态学 Q1 ECOLOGY

Ecological Engineering

Pub Date : 2025-10-30 DOI: 10.1016/j.ecoleng.2025.107844

Xiaojing Liu , Yan Wang , Yingying Zhang , Hongzhou Zhang , Haiqin Liu , Qing Zhou , Xuezheng Wen , Zhiyong Zhang

Agricultural non-point source (NPS) pollution and greenhouse gas (GHG) emissions are worldwide environmental challenges threatening sustainable agriculture. While eco-ditches are known to control NPS pollution, their role in simultaneously mitigating GHG emissions remains poorly quantified. This study aimed to elucidate the dual role of eco-ditches in reducing both NPS pollution and GHG emissions from farmland effluents. Here, a novel eco-ditch has been constructed in combination with a dual-layered vegetation and two distinct engineered biofilm carriers to assess the nitrogen removal efficiency, unravel the spatiotemporal variations of emission fluxes of GHGs, and elucidate the nitrogen metabolism pathway. The average removal efficiency of NO₃⁻-N, NO₂⁻-N, NH₄⁺-N, and TN were 37.8 %, 8.2 %, 23.7 %, and 28.7 %, respectively. Among the species tested, Acorus calamus exhibited the lowest global warming potential (GWP) (47.68–97.77 mg CO_2-eq m⁻² h⁻¹). This finding highlights its significant role in mitigating GHG emissions from eco-ditch systems compared to Vallisneria spiralls (45.35–151.29 mg CO_2-eq m⁻² h⁻¹) and the blank control (42.22–138.63 mg CO_2-eq m⁻² h⁻¹). Additionally, GHG emissions in this study were significantly correlated with functional microorganisms in water, stone filter, and biological stuffing samples (Mantel's p < 0.05). Nitrogen is usually removed and fixed by a series of microbial processes and plant uptake. These findings demonstrate the significant potential of eco-ditches to advance sustainable agriculture, enhance regional water quality, and mitigate climate change, thereby providing a strong scientific basis for their large-scale adoption.

农业非点源污染和温室气体排放是威胁农业可持续发展的全球性环境挑战。虽然已知生态沟渠可以控制NPS污染，但它们在同时减少温室气体排放方面的作用仍然很少量化。本研究旨在阐明生态沟渠在减少NPS污染和农田污水温室气体排放方面的双重作用。本研究以双层植被和两种不同工程生物膜载体为载体，构建新型生态沟，评估其脱氮效率，揭示温室气体排放通量的时空变化，阐明氮代谢途径。对NO3−-N、NO2−-N、NH4+-N和TN的平均去除率分别为37.8%、8.2%、23.7%和28.7%。菖蒲的全球变暖潜能值（GWP）最低（47.68 ~ 97.77 mg CO2-eq m−2 h−1）。这一发现强调了其在减少生态沟系统温室气体排放方面的重要作用，相比之下，螺旋藻（45.35-151.29 mg CO2-eq m−2 h−1）和空白对照（42.22-138.63 mg CO2-eq m−2 h−1）。此外，本研究中的温室气体排放与水、石滤器和生物填料样品中的功能微生物显著相关（Mantel's p < 0.05）。氮通常通过一系列微生物过程和植物吸收来去除和固定。这些发现证明了生态沟渠在促进可持续农业、改善区域水质和减缓气候变化方面的巨大潜力，从而为大规模采用生态沟渠提供了强有力的科学依据。

{"title":"Nitrogen removal from farmland effluents through novel eco-ditch system: Performance and mechanism","authors":"Xiaojing Liu , Yan Wang , Yingying Zhang , Hongzhou Zhang , Haiqin Liu , Qing Zhou , Xuezheng Wen , Zhiyong Zhang","doi":"10.1016/j.ecoleng.2025.107844","DOIUrl":"10.1016/j.ecoleng.2025.107844","url":null,"abstract":"<div><div>Agricultural non-point source (NPS) pollution and greenhouse gas (GHG) emissions are worldwide environmental challenges threatening sustainable agriculture. While eco-ditches are known to control NPS pollution, their role in simultaneously mitigating GHG emissions remains poorly quantified. This study aimed to elucidate the dual role of eco-ditches in reducing both NPS pollution and GHG emissions from farmland effluents. Here, a novel eco-ditch has been constructed in combination with a dual-layered vegetation and two distinct engineered biofilm carriers to assess the nitrogen removal efficiency, unravel the spatiotemporal variations of emission fluxes of GHGs, and elucidate the nitrogen metabolism pathway. The average removal efficiency of NO<sub>3</sub><sup>−</sup>-N, NO<sub>2</sub><sup>−</sup>-N, NH<sub>4</sub><sup>+</sup>-N, and TN were 37.8 %, 8.2 %, 23.7 %, and 28.7 %, respectively. Among the species tested, <em>Acorus calamus</em> exhibited the lowest global warming potential (GWP) (47.68–97.77 mg CO<sub>2-eq</sub> m<sup>−2</sup> h<sup>−1</sup>). This finding highlights its significant role in mitigating GHG emissions from eco-ditch systems compared to <em>Vallisneria spiralls</em> (45.35–151.29 mg CO<sub>2-eq</sub> m<sup>−2</sup> h<sup>−1</sup>) and the blank control (42.22–138.63 mg CO<sub>2-eq</sub> m<sup>−2</sup> h<sup>−1</sup>). Additionally, GHG emissions in this study were significantly correlated with functional microorganisms in water, stone filter, and biological stuffing samples (Mantel's <em>p</em> < 0.05). Nitrogen is usually removed and fixed by a series of microbial processes and plant uptake. These findings demonstrate the significant potential of eco-ditches to advance sustainable agriculture, enhance regional water quality, and mitigate climate change, thereby providing a strong scientific basis for their large-scale adoption.</div></div>","PeriodicalId":11490,"journal":{"name":"Ecological Engineering","volume":"223 ","pages":"Article 107844"},"PeriodicalIF":4.1,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145413152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0