Ecohydrology & Hydrobiology最新文献_第5页

Comparison of potential future impacts of climate change on Streamflows in tropical and subtropical watersheds 未来气候变化对热带和亚热带流域水流影响的比较

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100699

Imiya Mudiyanselage Chathuranika , Dalya Ismael

Understanding climate change impacts on watersheds is critical for sustainable water management, ecosystem protection, and resilience planning. This study compares projected streamflow changes in two watersheds: the tropical Upper Nilwala Watershed (UNW), Sri Lanka, and the subtropical Upper James Watershed (UJW), Virginia, USA. Streamflows for both watersheds are simulated using the Hydrologic Engineering Center's Hydrologic Modeling System (HEC-HMS) hydrological model, with future climate projections bias-corrected using the Linear Scaling Method (LSM). The analysis spans three future periods; Near (NF: 2026–2050), Mid (MF: 2051–2075), and Far Future (FF: 2076–2100) against a 1998–2022 baseline period, using ensembles of selected GCM-RCM combinations under medium (Shared Socioeconomic Pathway SSP 2-4.5 (Representative Concentration Pathway RCP 4.5)) and high (SSP 5-8.5 (RCP 8.5)) Emission Scenarios (ESs). Projections show diverging trends: UJW may face annual precipitation declines of 8.19% (SSP 2-4.5 (RCP 4.5)) and 14.63% (SSP 5-8.5 (RCP 8.5)), while UNW could see increases of approximately 10.80%, during 2026-2100 respectively. By 2100, UNW at Pitabeddara may experience up to a 56.53% rise in annual discharge (SSP 2-4.5 (RCP 4.5)), whereas UJW at Holcomb-Rock may see only a 4.16% increase (SSP 2-4.5) or a slight 0.62% decrease (SSP 5-8.5 (RCP 8.5)). Monthly and seasonal flows differ sharply: UNW may rise by 136.7% during the northeast monsoon season, while UJW trends vary gains in summer/autumn, but spring/winter declines up to 12.48%. These contrasts highlight the need for region-specific adaptive strategies, emissions mitigation, and addressing model uncertainties for effective long-term water management.

了解气候变化对流域的影响对于可持续水资源管理、生态系统保护和弹性规划至关重要。本研究比较了斯里兰卡热带上尼尔瓦拉流域（UNW）和美国弗吉尼亚州亚热带上詹姆斯流域（UJW）两个流域的预测流量变化。使用水文工程中心的水文建模系统（HEC-HMS）水文模型模拟了两个流域的河流流量，并使用线性标度法（LSM）对未来气候预测进行了偏差校正。分析跨越了未来的三个时期；近（NF: 2026-2050）、中（MF: 2051-2075）和远未来（FF: 2076-2100）在1998-2022基线期，使用中（共享社会经济路径SSP 2-4.5（代表性浓度路径RCP 4.5））和高（SSP 5-8.5 (RCP 8.5)）排放情景（ESs）下选定的GCM-RCM组合的集合。在2026-2100年期间，UJW可能面临8.19% （SSP 2-4.5 (RCP 4.5)）和14.63% （SSP 5-8.5 (RCP 8.5)）的年降水量减少，而UNW可能分别增加约10.80%。到2100年，Pitabeddara的UNW年流量可能会增加56.53% (SSP 2-4.5 (RCP 4.5))，而holcomm - rock的UJW可能只会增加4.16% （SSP 2-4.5）或轻微减少0.62% （SSP 5-8.5 (RCP 8.5)）。月流量和季节流量差异很大：东北季风季节UNW可能上升136.7%，而UJW趋势在夏秋季节有所变化，但春冬季节下降幅度高达12.48%。这些对比突出表明，需要制定针对特定区域的适应战略、减缓排放和解决模式不确定性，以实现有效的长期水资源管理。

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引用次数: 0

Constructed wetlands as post-treatment in Isfahan, Iran: Evaluation with different sizes of natural pumice 伊朗伊斯法罕人工湿地的后处理：不同大小天然浮石的评价

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100651

Tayebeh Omidinia-Anarkoli, Mohammad Shayannejad

Wastewater reuse is a promising solution to the water crisis in Iran, requiring cost-effective and eco-friendly treatment methods. This study evaluated the performance of pilot-scale constructed wetlands (CWs) treating effluent from the Fooladshahr wastewater treatment plant in Isfahan, Iran. Two CW configurations were tested: (1) horizontal subsurface flow CWs (HCWs) and (2) hybrid CWs combining horizontal and vertical flow (HV-CWs). Four experimental units were constructed for each configuration (total: 8 CWs). Two pumice particle sizes (P1: 15–30 mm and P2: 3–9 mm) were used as substrates, and the effect of plants (Phragmites australis) was assessed. The mean theoretical hydraulic retention times (HRTs) were 3 days for HCWs and 1.1 days for HV-CWs. CWs with smaller filler sizes generally performed better, reducing total suspended solids (TSS), biochemical oxygen demand (BOD₅), and chemical oxygen demand (COD) by up to 87.72 ± 7.96 %, 70.02 ± 24.72 %, and 69.40 ± 12.70 %, respectively. This improvement is due to enhanced physical and biological treatment. The presence of plants improved BOD₅ and COD removal in CWs with larger filler sizes, increasing efficiency by 20 % in HCWs. Seasonal variations in phosphate (PO₄³) removal were observed, with better removal in warmer periods (44.45 ± 15.57 %), particularly in unplanted CWs with smaller fillers. All CWs achieved over 85 % fecal coliform (FC) removal, with planted CWs using smaller pumice sizes showing the lowest FC concentrations. While smaller filler size HV-CWs showed superior performance, larger planted HCWs provided a cost-effective alternative. Further research is needed to assess long-term performance in various contexts.

废水回用是解决伊朗水危机的一个有希望的解决方案，需要具有成本效益和生态友好的处理方法。本研究评估了中试规模人工湿地（CWs）处理伊朗伊斯法罕Fooladshahr污水处理厂废水的性能。试验了两种连续波配置：(1)水平地下流连续波（HCWs）和(2)水平与垂直混合流连续波（HV-CWs）。每种配置构建4个实验单元（共8个CWs）。以2种浮石粒径（P1: 15 ~ 30 mm）和P2: 3 ~ 9 mm)为底物，评价植物芦苇（Phragmites australis）的效果。HCWs的平均理论水力滞留时间（HRTs）为3天，HV-CWs的平均理论水力滞留时间为1.1天。填料粒径越小，总悬浮物（TSS）、生化需氧量（BOD5）和化学需氧量（COD）的降幅分别为87.72±7.96%、70.02±24.72%和69.40±12.70%。这种改善是由于加强了物理和生物处理。植物的存在提高了填料尺寸较大的化粪池中BOD5和COD的去除率，使其效率提高了20%。磷酸盐（PO43）去除率随季节变化而变化，在较温暖的季节去除率较好（44.45±15.57%），特别是在未种植的CWs中，使用较小的填料。所有化粪池的粪大肠菌群去除率均超过85%，其中使用较小浮石粒径的种植化粪池的粪大肠菌群浓度最低。虽然较小的填充尺寸的hcv - cws具有更好的性能，但较大的种植hcv提供了成本效益的选择。需要进一步的研究来评估在各种情况下的长期表现。

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引用次数: 0

Effects of the global change on the thermal habitat quality for Salmonids within the Upper Soča watershed in Slovenia 全球变化对斯洛文尼亚上so<s:1>流域鲑科鱼热生境质量的影响

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100705

Delphine Nicolas , Baptiste Testi , Dušan Jesenšek , Kim Leban , Alain J. Crivelli

Temporal data series of water temperature collected at various locations in the Upper Soča river basin, a pristine area in Slovenia, from 1996 to 2022, were analyzed to assess any trends as potential effects of the global change. Different temperature metrics were calculated to study more especially eventual impacts on trout species known as present in the target sites: the endemic marble trout (Salmo marmoratus), the introduced common trout (Salmo trutta) and hybrid trout (S. marmoratus x S. trutta). Significant trends were observed in more than half of the streams considered, indicating a general warming of water temperatures across the entire Upper Soča basin. The high regional coherence found for streams in the three watersheds (Soča, Bača and Idrijca) studied suggested regional synchrony and an overall predominant climatic influence. However, a greater variation was observed in spring and summer, suggesting the implications of additional local factors. The majority of the monitored sites (n = 18 out of 25) experienced an increase in the annual mean temperature (+ 0.04 °C per year on average), especially in summer (+0.1 °C per year on average for 19 sites) when flows were lower. Thermal conditions remained favourable for salmonids in all sites. However, temperatures above 15 °C or even 19 °C are expected to be increasingly recorded, enhancing periods with stressful conditions for salmonids, at first for the endemic S. marmoratus.

研究人员分析了1996年至2022年在斯洛文尼亚原始地区上so a河流域不同地点收集的水温时序数据，以评估全球变化的潜在影响趋势。计算了不同的温度指标，以更具体地研究对目标地点已知的鳟鱼物种的最终影响：特有的大理石鳟鱼（Salmo marmoratus），引入的普通鳟鱼（Salmo trutta）和杂交鳟鱼（S. marmoratus x S. trutta）。在被考虑的河流中，有一半以上观察到明显的趋势，表明整个上so流域的水温普遍变暖。研究发现，三个流域（so a、ba a和Idrijca）的河流具有高度的区域一致性，这表明区域同步和总体上占主导地位的气候影响。然而，在春季和夏季观察到的变化更大，这表明其他当地因素的影响。大多数监测站点（25个站点中有18个站点）的年平均温度都有所上升（平均每年+ 0.04°C），特别是在流量较低的夏季（19个站点平均每年+0.1°C）。所有地点的热条件对鲑科鱼仍然有利。然而，预计将越来越多地记录到高于15°C甚至19°C的温度，这将增加鲑科鱼的压力期，首先是地方性的S. marmoratus。

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引用次数: 0

Carbon isotopic and geochemical insights into groundwater contamination by landfill leachate 垃圾渗滤液污染地下水的碳同位素和地球化学研究

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100682

Giovanna Orletti Del Rey, Luciano Soares da Cunha, Roberto Ventura Santos

Landfill leachate is a major source of water resource contamination, especially at sites without engineered liners. Its complex mix of organic and inorganic pollutants poses risks to human health and the environment. When aquifers fail to prevent contaminant migration, plumes form and typically attenuate with distance from the source. The stabilization stage of a landfill influences the isotopic composition of CO₂ produced during organic matter degradation, with δ¹³C signatures serving as effective tracers in aquifers. This study investigates contamination near the Jockey Club of Brasília landfill (JCBL), a 50-year-old decommissioned site in Brazil, using δ¹³C of dissolved inorganic carbon (δ¹³C-DIC) and complementary geochemical indicators. Leachate from JCBL is enriched in heavy carbon isotopes (δ¹³C ≈ +13 ‰), contrasting with δ¹³C-DIC values in local groundwater (∼−12 ‰). Isotopic mass balance suggests that approximately 48 % of the DIC in the shallow aquifer originates from leachate, a conservative estimate given possible effects of methane oxidation. Elevated Fe²⁺ levels also indicate redox-driven mobilization via Fe³⁺ reduction in Fe-rich oxisols. Surface water in the Cabeceira do Valo stream shows lower contaminant levels but cannot be deemed unaffected. The δ¹³C-DIC value in the stream (−9.64 ‰) is enriched relative to deep groundwater, suggesting partial leachate influence. Isotopic modeling estimates that ∼7.9 % of the stream’s DIC derives from leachate carbon, likely through subsurface discharge or mixing with impacted groundwater. These findings confirm the utility of δ¹³C-DIC as a tracer of landfill contamination and underscore the need for strategies to protect vulnerable water resources.

垃圾渗滤液是水资源污染的主要来源，特别是在没有工程衬垫的地方。其有机和无机污染物的复杂组合对人类健康和环境构成威胁。当含水层不能阻止污染物的迁移时，就会形成羽流，而且通常会随着距离污染源的远近而减弱。垃圾填埋场的稳定阶段影响有机质降解过程中产生的CO₂的同位素组成，δ¹³C特征在含水层中是有效的示踪剂。本研究利用溶解无机碳δ¹³C （δ¹³C- dic）和互补的地球化学指标，对巴西有50年历史的废弃填埋场Brasília赛马会附近的污染进行了调查。JCBL渗滤液富集重碳同位素（δ¹³C≈+13‰），与当地地下水δ¹³C- dic值（~−12‰）形成鲜明对比。同位素质量平衡表明，浅层含水层中大约48%的DIC来自渗滤液，这是考虑到可能受到甲烷氧化影响的保守估计。升高的Fe +水平也表明富铁氧化物中Fe +的还原是氧化还原驱动的动员。Cabeceira do Valo河流的地表水显示出较低的污染物水平，但不能认为未受影响。河流δ¹³C-DIC值（- 9.64‰）相对于深层地下水较为富集，提示部分渗滤液的影响。同位素模型估计，河流中约7.9%的DIC来自渗滤液碳，可能是通过地下排放或与受影响的地下水混合。这些发现证实了δ¹³C-DIC作为垃圾填埋场污染示踪剂的效用，并强调了保护脆弱水资源的策略的必要性。

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引用次数: 0

Phytotoxicity of products of selected technological variants of chemical oxidation of leachates from municipal waste landfills 城市垃圾填埋场渗滤液化学氧化工艺选择变体产物的植物毒性

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100661

Justyna Koc-Jurczyk, Łukasz Jurczyk, Agnieszka Podolak, Aleksandra Pasek, Michał Dyka

Landfill leachate (LL) is one of the main environmental threats of waste landfilling, therefore it is crucial to effectively dispose before discharged into a receiver body. To increase the treatment efficiency of LL from landfills operated for >10 years, physicochemical methods, such as Advanced Oxidation Process (AOP), are recommended. There are numerous data on the harmful effects of LL on representatives of successive trophic levels, but still insufficient in the case of products of various technologies of treatment and inflow characteristics. Phytotoxicity tests concern different stages of plant development, and they are most often based on the seed germination degree and root growth rate. This study aimed to assess changes in the biodegradability of organics in products of LL treatment by advanced oxidation with oxygen peroxide with Fenton's reagent, and further, their effect against a popular model organism in ecotoxicology - Lepidium sativum (garden cress). The following variants of the reagent ratios (Fe²⁺:H₂O₂): 1:1, 1:2 and 1:3 were tested for organic compounds removal. The efficiency of COD removal ranged from 13.3 to 36.5 %, whereas BOD₅/COD ratio increased from 0.11 up to 0.42 in the most optimal variant. Both, products of treatment and raw leachate (RL) inhibited the growth of plants, however, chemical oxidation significantly increased toxicity. Based on EC₅₀ (median effective concentration), the mixtures were ordered from the most to the least toxic: 32.90 % (1:2), 34.10 % (1:1), 39.29 % (1:3), 92.52 % (RL), and according to IC₅₀ (median inhibitory concentration) as follow: 1:3 - 11.73 %, 1:2 - 11.99 %, 1:1 - 12.60 %, RL - 48.18 %.

堆填渗滤液（LL）是垃圾填埋的主要环境威胁之一，因此在排放到接收体之前进行有效处理至关重要。为提高已运行10年的垃圾填埋场对LL的处理效率，建议采用高级氧化法（AOP）等物理化学处理方法。关于LL对连续营养水平代表的有害影响的数据很多，但对于不同处理技术的产品和流入特征的数据仍然不足。植物毒性试验涉及植物发育的不同阶段，它们通常基于种子发芽率和根系生长率。本研究旨在评估Fenton试剂深度氧化处理LL后产物中有机物可降解性的变化，以及它们对生态毒理学中流行的模式生物-莴苣的影响。测试了Fe2+:H2O2的试剂比例：1:1,1:2和1:3对有机物的去除效果。COD去除率在13.3% ~ 36.5%之间，BOD5/COD比值从0.11提高到0.42。处理产物和生渗滤液（RL）均抑制植物生长，但化学氧化显著增加毒性。根据EC50（中位有效浓度），从毒性最大到毒性最小依次为：32.90%（1:2）、34.10%（1:1）、39.29%（1:3）、92.52% (RL)；根据IC50（中位抑制浓度）依次为：1:3 ~ 11.73%、1:2 ~ 11.99%、1:1 ~ 12.60%、RL ~ 48.18%。

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引用次数: 0

Research on the relationship between vegetation coverage and groundwater depth in the Aksu River Basin, China 阿克苏河流域植被覆盖度与地下水深度关系研究

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100696

Yongkang Ding , Jianwei Sun , Hao Zhao , Zhirui Wang , Yanzhi Jin

The Aksu River Basin in the arid southern Xinjiang of China has a fragile ecosystem. Groundwater is one of the key factors restricting the growth and development of surface vegetation in arid areas. Quantitatively analyzing the relationship between groundwater depth affected by natural and anthropogenic factors and vegetation coverage is crucial for ecosystem security. This study selects the MOD13Q1 data and the groundwater depth data during the vegetation growing season (from May to September) from 2015 to 2020. Through linear analysis and the Geodetector model (GDM), this study quantitatively analyzed the response relationships among vegetation cover, land desertification, and groundwater depth. Using the GDM, it quantified the influence of 12 driving factors on the NDVI (Normalized Difference Vegetation Index). Additionally, it clarified the driving force behind the vegetation NDVI and its key factors, as well as the optimal range and type of factors conducive to vegetation growth, providing references and bases for ecological protection and sustainable development. Our study has demonstrated that: (1) Vegetation NDVI was most sensitive to groundwater depths of 2∼8 m. (2) Groundwater depths < 5 m increased vegetation cover, while depths > 8 m led to stable desertification levels. (3) The main factors affecting NDVI were land use type, soil moisture, and groundwater depth. (4) Factor interactions were primarily nonlinear, with land use and soil moisture having the strongest interaction. The optimal groundwater depth range for vegetation growth was 2.3∼4.2 m.

中国干旱的南疆阿克苏河流域生态系统脆弱。地下水是制约干旱区地表植被生长发育的关键因素之一。定量分析受自然和人为因素影响的地下水深度与植被覆盖度之间的关系对生态系统安全至关重要。本研究选取2015 - 2020年植被生长期（5 - 9月）MOD13Q1数据和地下水深度数据。通过线性分析和Geodetector模型（GDM），定量分析了植被覆盖、土地沙漠化和地下水深度之间的响应关系。利用GDM量化了12个驱动因子对NDVI（归一化植被指数）的影响。明确了植被NDVI的驱动力及其关键因子，以及有利于植被生长的因子的最优范围和类型，为生态保护和可持续发展提供参考和依据。研究表明：(1)植被NDVI对地下水深度2 ~ 8 m最为敏感。(2) 5 m地下水深度增加了植被覆盖，8 m地下水深度使沙漠化程度趋于稳定。(3)影响NDVI的主要因素是土地利用类型、土壤湿度和地下水深度。(4)各因子间的相互作用以非线性为主，其中土地利用与土壤湿度的相互作用最强。植被生长的最佳地下水深度范围为2.3 ~ 4.2 m。

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引用次数: 0

Ecohydrological impacts of Manjil Dam flushing on the downstream Sefidrud River and two coastal lagoons of the Southern Caspian Sea 曼吉尔大坝冲水对塞菲鲁德河下游和南里海两个沿海泻湖的生态水文影响

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100680

Saeed Poorasadollah , Ziaoddin Shoaei , Mohsen Shariat Jafari , Ali Sorbi

The ecohydrological consequences of dam sediment flushing remain poorly understood, particularly in lowland rivers and coastal systems. This study investigates the long-term impacts of uncontrolled flushing operations from the Manjil Dam on the downstream Sefidrud River and the ecologically sensitive Kiashahr and Zibakenar lagoons along the southern Caspian Sea. Using hydrochemical analyses, sediment core data, and satellite-derived indices of turbidity and eutrophication, we demonstrate that sediment flushing significantly altered riverine and lagoonal processes. Flushing-induced sediment discharge peaked at 8.3 times that of non-flushing days, raising suspended sediment concentrations above ecologically critical thresholds. These pulses led to widespread mass fish mortality and the degradation of benthic communities. Hydrochemical signatures shifted markedly, with elevated total dissolved solids, salinity, and ion concentrations, particularly Na⁺, Cl⁻, driven by evaporite dissolution and sediment remobilization. Remote sensing revealed a strong correlation between riverine turbidity and chlorophyll-a concentrations, evidencing enhanced eutrophication in the lagoons. Sediment core analysis confirmed long-term ecological degradation through the disappearance of charophytes and benthic foraminifera and the formation of azoic layers. Flushing disrupted natural flow regimes, shortened low-flow periods, and altered estuarine morphology. Despite rising Caspian Sea levels, accelerated sedimentation led to a 91 % and 32 % reduction in the area of Kiashahr and Zibakenar lagoons, respectively. A large portion of flushed sediments settled in the riverbed, elevating downstream suspended sediment concentration above upstream levels during non-flushing days, prolonging biotic stress. These findings reveal the lasting ecohydrological impacts of sediment flushing, highlighting its role in degrading the health and biodiversity of the freshwater-to-coastal continuum.

大坝沉积物冲刷的生态水文后果仍然知之甚少，特别是在低地河流和沿海系统。本研究调查了Manjil大坝不受控制的冲刷作业对下游Sefidrud河以及沿里海南部生态敏感的Kiashahr和Zibakenar泻湖的长期影响。利用水化学分析、沉积物核心数据和卫星衍生的浊度和富营养化指数，我们证明了沉积物冲刷显著改变了河流和泻湖的过程。冲水引起的沉积物排放量达到非冲水天数的8.3倍，使悬浮沉积物浓度超过生态临界阈值。这些脉冲导致广泛的鱼类大量死亡和底栖生物群落的退化。水化学特征发生了明显的变化，随着溶解固体总量、盐度和离子浓度的升高，尤其是Na +、Cl⁻，在蒸发岩溶解和沉积物再活化的作用下发生了变化。遥感显示，河流浊度与叶绿素-a浓度之间存在很强的相关性，证明了泻湖富营养化的加剧。沉积物岩心分析证实了长期的生态退化，主要是通过绿叶植物和底栖有孔虫的消失和无氮层的形成。冲积破坏了自然流态，缩短了低流量期，改变了河口形态。尽管里海水位上升，但加速的沉积导致Kiashahr和Zibakenar泻湖的面积分别减少了91%和32%。大部分冲刷后的沉积物在河床上沉淀，使下游悬浮沉积物浓度在非冲刷日高于上游水平，延长了生物压力。这些发现揭示了沉积物冲刷的持久生态水文影响，突出了其在降低淡水-海岸连续体的健康和生物多样性方面的作用。

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引用次数: 0

Impact of environmental selection on spatial heterogeneity of summer phytoplankton community in Pearl River Estuary, China 环境选择对珠江口夏季浮游植物群落空间异质性的影响

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100695

Chunhui Xiong , Chuqian Lu , Houlei Jia , Tao Liu , Zhenxiong Yang , Wei Deng , Zhiming Guo , Yinghua Huang , Yuhong Zhong , Tuanjie Li

Beta diversity (β) refers to the spatial variation in species composition, and understanding its patterns and the driving factors is crucial for comprehending biodiversity. To accurately analyze the factors influencing the maintenance of phytoplankton β diversity in the Pearl River Estuary (PRE), we employed Generalized Dissimilarity Modeling (GDM) to assess the relative importance of environmental and spatial processes. Our findings indicated that both environmental selection and spatial processes shape β diversity, with environmental selection exerting a predominant influence in the PRE. The spatial heterogeneity of phytoplankton in the PRE is affected by both natural and anthropogenic factors. Salinity is the primary driver, followed by transparency, suspended solids, and nutrients. As a distance-based nonlinear regression method, GDM effectively identified community variation of phytoplankton along environmental and spatial gradients. This study provides valuable insights for policy-making and management decisions by the relevant administrative bodies within the PRE.

β多样性（Beta diversity, β）是指物种组成的空间变异，了解其格局及其驱动因素是理解生物多样性的关键。为了准确分析珠江口（PRE）浮游植物β多样性维持的影响因素，采用广义不相似模型（GDM）对环境过程和空间过程的相对重要性进行了评价。研究结果表明，环境选择和空间过程共同塑造了β多样性，其中环境选择在PRE中发挥了主导作用。浮游植物的空间异质性受到自然和人为因素的双重影响。盐度是主要驱动因素，其次是透明度、悬浮物和营养物质。GDM是一种基于距离的非线性回归方法，能有效识别浮游植物群落沿环境和空间梯度的变化。这项研究为PRE内有关行政机构的决策和管理决策提供了宝贵的见解。

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引用次数: 0

Modeling hydrological conditions of oxbow lakes and assessing its effect on carbon sequestration in Diara Ganges plain 迪亚拉恒河平原牛轭湖水文条件模拟及其对碳固存的影响

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100687

Ripan Ghosh, Somnath Saha, Manashi Haldar, Sandipta Debanshi, Swades Pal

Hydrologically irregular, shallower wetlands particularly in isolated oxbow lakes are frequently overlooked due to their low provisioning services neglecting their role towards regulating services. The present study aimed to explore how hydrological condition of oxbow lakes in Diara floodplain of Ganges plain controls carbon sequestration. Both remote sensing and field data were taken for this. Water presence frequency (WPF), hydro-period (HP) and water depth (WD) were taken for developing analytical hierarchy process (AHP)-based weighted water richness (WR) model of from 1991 to 2023. Carbon sequestration was estimated using spectral vegetation index (Normalized difference vegetation index (NDVI)) and field-driven biomass coupled regression. Association between WR and Carbon (C) sequestration was done using correlation and Ordinary least square (OLS) regression approach. Study revealed significant areal shrinkage and seasonal dynamics in hydrological condition. WR model exhibited about 50 % drop area under good WR zone. Total estimated C sequestration potentiality is 1.3 × 10*³ Mg and 1.1 × 10*³ Mg in the cycle I and II with higher in winter and summer seasons. Association between predicted WR and C sequestration reported that low WR condition is more potential for C sequestration due to higher growth of vegetation. These findings indicate that hydrologically poorer wetlands are ambient for vegetation growth which makes it an effective sink of carbon and therefore should be also be preserved amid climate change scenario. For instance, good WR area could be focused for livelihood supporting fishing and poor WR area could be used for carbon sink.

水文不规则、较浅的湿地，特别是在孤立的牛轭湖中，由于其供应服务低而经常被忽视，忽视了它们在调节服务方面的作用。本研究旨在探讨恒河平原Diara漫滩牛轭湖的水文条件对碳固存的控制作用。为此采用了遥感和实地数据。采用1991 - 2023年的水存在频率（WPF）、水周期（HP）和水深（WD）建立了基于层次分析法（AHP）的加权水丰富度（WR）模型。利用光谱植被指数（归一化植被指数（NDVI））和野外驱动的生物量耦合回归估算了碳固存。利用相关和普通最小二乘（OLS）回归分析了WR与碳(C)固存之间的关系。研究结果表明，流域水文条件具有明显的面积收缩和季节动态特征。WR模型在良好的WR区下，下降面积约为50%。循环ⅰ和循环ⅱ的总碳固存潜力分别为1.3 × 10* 3mg和1.1 × 10* 3mg，冬、夏两季碳固存潜力较高。预测WR与碳固存的关联表明，低WR条件下由于植被生长旺盛，碳固存的潜力更大。这些发现表明，水文条件较差的湿地是植被生长的环境，使其成为有效的碳汇，因此在气候变化情景下也应加以保护。例如，良好的水域可重点用于生计支持渔业，而较差的水域可用于碳汇。

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引用次数: 0

The role of crustacean zooplankton in water quality monitoring: Findings from two Portuguese reservoirs 甲壳类浮游动物在水质监测中的作用：来自两个葡萄牙水库的发现

IF 2.2 4区环境科学与生态学 Q2 ECOLOGY

Ecohydrology & Hydrobiology

Pub Date : 2025-12-01 DOI: 10.1016/j.ecohyd.2025.100646

Ivo Pinto , Luísa Azevedo , Sara C. Antunes

Zooplankton is a key biological element in the aquatic food web. Although currently the European Water Framework Directive (WFD) does not include zooplankton in the biological assessments, the investigation of its potential contribution to water quality is crucial for an integrated evaluation of aquatic ecosystems. For one year, zooplankton communities from Portuguese reservoirs Rabagão and Aguieira, were sampled seasonally and characterized with several metrics and indexes (proportion of Calanoid/Cyclopoid ratios, feeding strategies and Zooplankton Reservoir Trophic Index - ZRTI). This strategy aimed to evaluate the ability of these endpoints to detect differences among trophic status and ecological potential in heavily modified water bodies. The two target reservoirs presented different classifications according to the WFD. Rabagão has good ecological potential, with higher Calanoid/Cyclopoid ratios and a greater proportion of large Cladocera to total Cladocera. On the other hand, Aguieira showed a poor ecological potential, mainly due to high phosphate concentrations, as well as low quality of phytoplankton (e.g., cyanobacteria concentration). In this reservoir, a greater abundance and diversity of zooplankton, was observed, which include highly efficient filter feeders organisms. Additionally, the ZRTI proved to be a sensitive discriminating element regarding the zooplankton community, which vary according to the quality of the two studied reservoirs. Our data, although limited to two reservoirs, indicate that ZRTI can complement the information given by the phytoplankton community in the water reservoir evaluation and, can be included in monitoring programs providing an effective indicator of bottom-up and top-down water quality.

浮游动物是水生食物网中的关键生物元素。尽管目前《欧洲水框架指令》（WFD）并未将浮游动物纳入生物评价，但调查其对水质的潜在贡献对于水生生态系统的综合评价至关重要。对葡萄牙rabag o和Aguieira水库的浮游动物群落进行了为期一年的季节性采样，并采用若干指标和指标（类Calanoid/ cyclopooid比值、摄食策略和浮游动物水库营养指数- ZRTI）对其进行了表征。该策略旨在评估这些端点在重度改造水体中检测营养状况和生态潜力差异的能力。根据WFD，两个目标储层呈现出不同的分类。rabag具有良好的生态潜力，类callanoid / cyclopooid比值较高，大型枝目占总枝目的比例较大。另一方面，Aguieira显示出较差的生态潜力，主要是由于磷酸盐浓度高，以及浮游植物质量低（如蓝藻浓度）。在这个水库中，观察到更丰富和多样性的浮游动物，其中包括高效滤食性生物。此外，ZRTI被证明是浮游动物群落的敏感区分因子，浮游动物群落因两个研究水库的质量而异。虽然我们的数据仅限于两个水库，但表明ZRTI可以补充浮游植物群落在水库评价中的信息，并且可以纳入监测方案，为自下而上和自上而下的水质提供有效指标。

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引用次数: 0