Ecological Indicators最新文献_第7页

Long-term variations in hydraulic residence time of floodplain lakes and their response to water conservancy projects 洪泛区湖泊水力停留时间的长期变化及其对水利工程的响应

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-15 DOI: 10.1016/j.ecolind.2024.112778

Aiping Huang , Xiaobo Liu , Fei Dong , Wenqi Peng , Bing Ma , Zhen Han , Xiaochen Yang

Hydraulic residence time, a key indicator to evaluate the hydrodynamic processes of a lake, especially a floodplain lake, critically affects environmental processes such as water self-purification and algal transport. The hydraulic residence time of Poyang Lake in the east of China, a typical floodplain lake, exhibits significant and complicated variations. Focusing on Poyang Lake, this study adopted the hydraulic data from 1979–2018 to calculate the hydraulic residence time of the lake. Different methods, such as the Mann–Kendall method and hydrodynamic modeling, were used to reveal the long-term variations in the hydraulic residence time and explore the reasons for these variations. Subsequently, this study predicted the possible effects of the planned water conservancy project on the hydraulic residence time of the floodplain lake. The main results can be summarized as follows: (1) In the past 40 years, the annual average hydraulic residence time of Poyang Lake varied between 8.6 and 20.1 d, with a significant reduction noted. Furthermore, the monthly average hydraulic residence time decreased considerably, with the decline in July–September being the most significant. (2) The annual average outflow rate of Poyang Lake increased insignificantly, while the annual average lake volume decreased significantly, which were possibly the main reasons for variations in the annual average hydraulic residence time. (3) In the future, with the planned Poyang Lake water conservancy project (PLWCP), the low water level of the lake is expected to be compensated for by increasing the water level during the regulation period; thus, the hydraulic residence time of the lake would be extended. The findings of this study could deepen the understanding of the hydrodynamic characteristics of floodplain lakes and their responses to water conservancy projects; they could also provide technical foundations for water resource management and environmental protection of floodplain lakes.

水力停留时间是评价湖泊（尤其是洪泛平原湖泊）水动力过程的关键指标，对水体自净和藻类迁移等环境过程具有重要影响。中国东部鄱阳湖是典型的洪泛平原湖泊，其水力停留时间呈现出显著而复杂的变化。本研究以鄱阳湖为研究对象，采用 1979-2018 年的水力资料计算鄱阳湖的水力停留时间。采用 Mann-Kendall 法和水力学模型等不同方法揭示了水力停留时间的长期变化，并探讨了变化的原因。随后，本研究预测了规划中的水利工程对洪泛湖水力停留时间可能产生的影响。主要结果可归纳如下：(1）近 40 年来，鄱阳湖的年平均水力停留时间在 8.6 至 20.1 d 之间变化，并有明显的缩短。此外，鄱阳湖月平均水力停留时间也有较大幅度的下降，其中以 7-9 月下降最为显著。(2）鄱阳湖年平均出湖率增加不明显，而年平均湖泊容积却明显减少，这可能是造成年平均水力停留时间变化的主要原因。(3) 未来，随着鄱阳湖水利枢纽工程的实施，湖泊低水位有望在调节期通过提高水位得到补偿，从而延长湖泊的水力停留时间。本研究的结果可加深对洪泛平原湖泊水动力特性及其对水利工程响应的理解，并为洪泛平原湖泊的水资源管理和环境保护提供技术基础。

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引用次数: 0

Dispersal limitations prompt early vegetation aggregation in counter-seasonal reservoir riparian zones: A case study of Longkaikou Reservoir, China 传播限制促使反季节水库河岸带植被早期聚集：中国龙开口水库案例研究

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-15 DOI: 10.1016/j.ecolind.2024.112837

Weiwei Jiang , Wentao Jia , Henglin Xiao

In global water management, the winter-storage, summer-drainage reservoir mechanism effectively mitigates summer floods and winter droughts. However, this counter-seasonal operation poses complex challenges to riparian ecosystems. To explore Nature-based Solutions (NbS), a deep understanding of the spatial development mechanisms of dominant species is crucial. Taking the Longkaikou Reservoir on China’s Jinsha River as an example, we employed drone photogrammetry, quadrat surveys, and null model simulations to intuitively and quantitatively analyze the spatial patterns of dominant riparian species and the underlying ecological processes. Our results showed that a 40 m × 40 m area is the minimum sampling size for determining riparian plant communities. Habitat heterogeneity and dispersal limitation jointly influence population spatial patterns, modulated by spatial scale and species biology. At smaller scales, population aggregation is driven by reproduction and dispersal, while at larger scales, habitat filtering significantly impacts population distribution, leading to random or uniform patterns. Based on these findings, we propose an innovative NbS approach for riparian zones. Using the minimum sampling area as a unit, we suggest employing remote sensing and GIS for grid-based fine management. Within grids (at the community level), enhance habitat connectivity and prioritize native pioneer species with efficient dispersal mechanisms. Between grids (at the metapopulation and ecosystem levels), implement differentiated ecological strategies based on habitat heterogeneity. Additionally, fostering cross-regional and interdisciplinary collaboration will form an integrated research and application framework, supporting riparian ecosystem conservation.

在全球水资源管理中，冬蓄夏排的水库机制可有效缓解夏季洪水和冬季干旱。然而，这种反季节运行方式给河岸生态系统带来了复杂的挑战。要探索基于自然的解决方案（NbS），深入了解优势物种的空间发展机制至关重要。以中国金沙江龙开口水库为例，我们采用无人机摄影测量、四分点调查和空模型模拟等方法，直观、定量地分析了河岸优势物种的空间格局及其背后的生态过程。我们的研究结果表明，40 米 × 40 米的区域是确定河岸植物群落的最小取样尺寸。生境异质性和扩散限制共同影响种群空间模式，并受空间尺度和物种生物学的调节。在较小的尺度上，种群聚集是由繁殖和扩散驱动的，而在较大的尺度上，生境过滤对种群分布有显著影响，从而导致随机或均匀的模式。基于这些发现，我们为河岸带提出了一种创新的 NbS 方法。以最小采样区为单位，我们建议利用遥感和地理信息系统进行网格化精细管理。在网格内（群落层面），加强栖息地的连通性，优先选择具有高效传播机制的本地先锋物种。在网格之间（元种群和生态系统层面），根据栖息地的异质性实施不同的生态策略。此外，促进跨区域和跨学科合作将形成一个综合研究和应用框架，为河岸生态系统保护提供支持。

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引用次数: 0

Radial growth and climate responses of healthy versus decayed subalpine conifer trees in the southeastern Qinghai-Tibetan Plateau 青藏高原东南部健康亚高山针叶树与衰败亚高山针叶树的径向生长和气候反应

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-15 DOI: 10.1016/j.ecolind.2024.112845

Lingzhuo Luo , Wenzhi Wang , Zhehong Wu , Yong Su

The forest loss and degradation caused by tree heart rot presents an increasingly challenging issue for the protection and utilization of forest resources. Yet, it is questionable whether heartwood-decayed trees can still function on par with healthy trees. Here, using tree ring data, we established basal area increment (BAI) series of healthy and heartwood-decayed fir trees at four sites (Abies spectabilis in Bomi; A. georgei Orr in Deqin as well as the Sygera Mountain; A. fabri Craib in Yajiageng) in the southeastern Qinghai-Tibetan Plateau (QTP). We conducted a comparative analysis of the difference in the BAI, response to climate factors and elasticity under environmental stress between the healthy and decayed fir. The results show that, in QTP, fir susceptibility to decay is uncorrelated with growth rates. However, after decaying occurs in fir trees, their radial growth is restricted in warm and humid areas (i.e., at Bomi and Yajiageng). The average BAI of healthy fir is 70.32 % and 86.32 % higher than that of decayed fir in Bomi and Yajiageng respectively (p < 0.01), but no significant difference in Deqin and Sygera (p > 0.05). Moreover, healthy fir exhibits a more pronounced response to climatic conditions. Almost all BAI series of healthy and decayed fir in the southeastern QTP is positively correlated with the temperature and vapor pressure deficit. Under temperature stress, decayed fir trees are less resistant at three sites. This empirical study supports that there is no correlation between conifer trees’ radial growth rate and their likelihood of heartwood decay, and provides a compelling explanation for the constrained growth of decayed fir trees. Our findings can bolster the accurate assessment of carbon sinks and the conservation of forest resources in regions prone to high-decaying risks.

树木心材腐烂造成的森林损失和退化对森林资源的保护和利用提出了日益严峻的挑战。然而，心材腐烂的树木是否仍能发挥与健康树木同等的功能还是个问题。在此，我们利用树环数据，在青藏高原东南部的四个地点（波密的Abies spectabilis、德钦和色季拉山的A. georgei Orr、雅家岗的A. fabri Craib）建立了健康杉木和心材腐烂杉木的基部面积增量（BAI）序列。我们对健康冷杉和腐烂冷杉在 BAI、对气候因子的响应和环境压力下的弹性方面的差异进行了比较分析。结果表明，在青藏高原，冷杉易腐性与生长率无关。然而，冷杉发生腐烂后，其径向生长在温暖潮湿地区（即波密和雅家坑）受到限制。在波密和雅家坑，健康冷杉的平均 BAI 分别比腐烂冷杉高 70.32 % 和 86.32 %（p <0.01），但在德钦和赛格拉没有显著差异（p >0.05）。此外，健康冷杉对气候条件的反应更为明显。QTP东南部健康冷杉和腐烂冷杉的几乎所有 BAI 序列都与温度和蒸气压差呈正相关。在温度胁迫下，三个地点的衰落杉树的抵抗力较弱。这项实证研究证明，针叶树的径向生长速度与其心材腐烂的可能性之间不存在相关性，并为腐烂杉树的生长受限提供了令人信服的解释。我们的研究结果有助于对碳汇进行准确评估，并保护高腐烂风险地区的森林资源。

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引用次数: 0

Region-county characteristics of spatiotemporal dynamic evolution and influencing factors on agricultural net carbon sink in Hexi region of Gansu Province 甘肃省河西地区农业净碳汇的区县时空动态演化特征及影响因素

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-15 DOI: 10.1016/j.ecolind.2024.112817

Lirong Wang , Peiji Shi , Jun Luo , Junfeng Yin , Fanyuan Cheng , Jing Shi , Ziyang Wang

Reducing emissions and enhancing carbon sinks are essential for promoting regional agriculture in a green, low-carbon manner. However, most studies have overlooked spatial dependence and heterogeneity while incomprehensively exploring the influencing factors. Taking the counties in the Hexi region as our primary focus, the net carbon sequestration and its spatial–temporal dynamic evolution process from 2000 to 2020 were calculated and explored, and the factors influencing and their spatial effect decomposition were investigated.We observed that although each county has been in a state of carbon surplus during the research term, there is a spatial imbalance among them. The overall tendency of the net farming carbon sinks in the Hexi area showed fluctuations and an upward trend, with higher values observed in the eastern region than in the northwest. Ganzhou District and Shandan County play pivotal roles regarding the movement of the center of gravity concerning agricultural net carbon sequestrations. Cultivated land area per capita contributes to county-level agricultural net carbon sequestration within the Hexi region. Per capita agricultural GDP, agricultural industrial structure, and financial support for agriculture demonstrate remarkable active spillover effects. Conversely, urbanization exhibits a notable opposite spillover effect. Our results can provide a scientific basement for formulating differentiated policies for low-carbon agricultural development in the Hexi region.

减少排放和增加碳汇对于以绿色、低碳的方式促进区域农业发展至关重要。然而，大多数研究忽视了空间依赖性和异质性，对影响因素的探讨也不够全面。我们以河西地区各县为主要研究对象，计算并探讨了 2000-2020 年净固碳量及其时空动态演化过程，并对影响因素及其空间效应分解进行了研究。河西地区农业净碳汇总体呈波动上升趋势，东部地区高于西北地区。甘州区和山丹县在农业净碳汇重心移动中具有举足轻重的作用。人均耕地面积是河西地区县级农业净固碳量的主要来源。人均农业 GDP、农业产业结构、财政支农力度等都表现出显著的积极溢出效应。相反，城镇化则表现出明显的反向溢出效应。我们的研究结果可为河西地区制定差异化的低碳农业发展政策提供科学依据。

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引用次数: 0

Hyperspectral remote sensing of chlorophyll a and pheophorbide a pigments for macrobenthos mapping on an estuarine tidal flat 利用高光谱遥感叶绿素 a 和嗜磷酸盐 a 色素绘制河口滩涂大型底栖生物分布图

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-15 DOI: 10.1016/j.ecolind.2024.112850

Ting Zhang , Dunia Rios-Yunes , Bo Tian , Dongyan Liu , Qi Liu , Karline Soetaert , Yunxuan Zhou , Daphne van der Wal

Macrobenthos play critical roles in estuarine tidal flats through bioturbation, biodeposition, and bioirrigation and serve as key elements in the food web, depending largely on microphytobenthos (MPB) and serving as prey for birds. As traditional field-based methods for determining the spatial distribution of macrobenthos are costly and time-consuming, in this study we investigated the potential of inferring macrobenthos from degradation products of chlorophyll-a, a proxy for MPB biomass. First, we identified the macrobenthic groups most closely related to the pheophorbide-a and chlorophyll-a (Pheob-a/Chl-a) ratios via in situ data, although relationships were typically not significant. We then characterized the spectral characteristics of this ratio through controlled indoor experiments, integrated them into a hyperspectral algorithm, and mapped the spatial distribution of macrobenthos in the Western Scheldt estuary with this algorithm via PRecursore IperSpettrale della Missione Applicativa (PRISMA) hyperspectral satellite data. Specifically, the ratio was significantly (but weakly) related to the macrobenthic group of carnivorous/omnivorous/scavenger-feeding Malacostraca and bivalves and subsurface deposit-feeding Gastropoda, as verified by independent data, without showing significant relationships with many other groups. The blue spectrum was sensitive to Pheob-a/Chl-a, and a stacking model leveraging this spectrum was used to estimate the ratio. The results indicated substantial spatial heterogeneity in the estimated Pheob-a/Chl-a from the PRISMA images. The spatiotemporal relationships between these macrobenthic groups and MPB varied. Thus, while the method is not suited for macrobenthos mapping, our proposed approach paves the way for further research using hyperspectral imagery for ecological assessment, with its potential and limitations discussed.

大型底栖生物通过生物扰动、生物沉积和生物灌溉在河口滩涂中发挥着关键作用，同时也是食物网中的关键要素，主要依赖于微囊藻（MPB）并成为鸟类的猎物。由于确定大型底栖生物空间分布的传统野外方法既费钱又费时，在本研究中，我们研究了从叶绿素-a（MPB 生物量的替代物）的降解产物推断大型底栖生物的可能性。首先，我们通过现场数据确定了与叶绿素-a（Pheob-a/Chl-a）比率关系最密切的大型底栖生物群，尽管两者之间的关系通常并不显著。然后，我们通过室内对照实验确定了这一比率的光谱特征，将其整合到高光谱算法中，并利用该算法通过 PRecursore IperSpettrale della Missione Applicativa (PRISMA) 高光谱卫星数据绘制了西斯海尔德河口大型底栖生物的空间分布图。具体而言，经独立数据验证，该比率与大型底栖生物中的肉食/食肉/食腐类 Malacostraca 和双壳类以及以地下沉积物为食的腹足类有明显关系（但很弱），而与许多其他类群没有明显关系。蓝色光谱对 Pheob-a/Chl-a 敏感，利用该光谱的叠加模型来估算比率。结果表明，PRISMA 图像估算出的 Pheob-a/Chl-a 在空间上存在很大差异。这些大型底栖生物群与 MPB 之间的时空关系也各不相同。因此，虽然该方法不适合大型底栖生物绘图，但我们提出的方法为利用高光谱图像进行生态评估的进一步研究铺平了道路，并讨论了其潜力和局限性。

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引用次数: 0

Robustness assessment of urban cold island network based on green infrastructure–A case study of Bengbu, China 基于绿色基础设施的城市冷岛网络鲁棒性评估--中国蚌埠案例研究

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-15 DOI: 10.1016/j.ecolind.2024.112842

Nana Guo, Xinbin Liang

Green infrastructure(GI) is important vehicle for mitigating urban heat islands(UHIs), and cold island areas can have real cooling effect on urban surface heat. Research on structural cooling strategies using GI network landscape connectivity as an entry point has gradually become a research hotspot; however, research lacks on enhancing GI cooling efficiency (cold island patch cooling effectiveness utilization or potential development) and dynamic construction adaptability. Tthe stability of a UCI network (UCIN) structure based on GI in different contexts can effectively enhance the efficiency and resilience of urban thermal environment regulations. This study considered the typical city of Bengbu and proposes an urban thermal environment research framework based on the robustness of UCINs, and land use and land surface temperature (LST) data, We extracted the core patches of GI by morphological spatial pattern analysis and screened UCI attributes to determine the UCIN source, constructed the resistance surface of thermal environment with the help of LST characteristics of land use, extracted UCIN corridors by the minimum cumulative resistance, and constructed the UCIN based on GI (GI-UCIN) in the mode of “source-corridor”. On this basis, the robustness characteristics of the UCIN were simulated with the help of multi-scenario network destruction experiments, the space to maintain the robustness of the UCIN structure was clarified, and the development and protection strategy of urban land classification to maintain the efficient and stable cooling effect of the GI-UCIN was proposed. The study shows that: (1) GI in Bengbu is the primary component of the UCI space, which can effectively break the spatial continuity of UHI patches; (2) GI-UCIN has the characteristics of a hollow outer dense circular structure and (3) the top 20% of GI-UCIN source nodes in the centrality ranking are key nodes in maintaining the effectiveness of the GI-UCIN. The results can provides a quantitative basis for determining the policy application point of GI development and protection oriented toward improvement of UHI; simultaneously, the research method can provides a new idea for urban cooling strategies, and further connect with urban planning and management.

绿色基础设施（GI）是缓解城市热岛（UHIs）的重要载体，冷岛区域对城市地表热量具有实际降温作用。以绿色基础设施网络景观连通性为切入点的结构降温策略研究已逐渐成为研究热点，但在提高绿色基础设施降温效率（冷岛片区降温效果利用或潜力开发）和动态建设适应性方面的研究还比较欠缺。基于地理信息系统的城市热环境网络（UCIN）结构在不同环境下的稳定性能有效提高城市热环境监管的效率和弹性。本研究以典型的蚌埠市为研究对象，基于 UCIN 的稳健性，结合土地利用和地表温度（LST）数据，提出了城市热环境研究框架，通过形态空间模式分析提取 GI 核心斑块，筛选 UCI 属性确定 UCIN 源，借助土地利用的 LST 特征构建热环境阻力面，通过最小累积阻力提取 UCIN 走廊，以 "源-走廊 "模式构建基于 GI 的 UCIN（GI-UCIN）。在此基础上，借助多场景网络破坏实验模拟了 UCIN 的鲁棒性特征，明确了维持 UCIN 结构鲁棒性的空间，提出了维持 GI-UCIN 高效稳定降温效果的城市用地分类发展与保护策略。研究结果表明(1）蚌埠市的GI是UCI空间的主要组成部分，能有效打破UHI斑块的空间连续性；（2）GI-UCIN具有中空外密的环状结构特征；（3）中心度排名前20%的GI-UCIN源节点是维持GI-UCIN有效性的关键节点。研究结果可为确定以改善超温差为导向的地理信息系统开发与保护的政策应用点提供定量依据；同时，该研究方法可为城市降温策略提供新思路，并进一步与城市规划和管理相衔接。

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引用次数: 0

Relationships between the spectral characteristics of dissolved organic matter and river ecological health indicators: A case study in the Shichuan River basin on a typical semi-arid and semi-humid region of China 溶解有机物光谱特征与河流生态健康指标之间的关系：中国典型半干旱半湿润地区石川河流域的案例研究

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-14 DOI: 10.1016/j.ecolind.2024.112836

Daoping Xi , En Hu , Ming Li , Jian Gao

The spectral characteristics of dissolved organic matter (DOM) in rivers are considered as potential indicators of river health status. In this study, relationships between DOM spectral properties and river ecological health indicators in Shichuan River, such as total nitrogen (TN), total phosphorus (TP), chlorophyll-a (Chl-a) content, diversity of macrobenthic invertebrates, water quality index (WQI), and trophic level index (TLI), etc., were investigated. According to the WQI values, the water quality of the Ju River and Taoqupo Reservoir was generally better than that of other river sections, while the Qinghe and the mainstream sections performed the worst. The fluorescence index (FI) and WQI reflects that the mainstream of the Shichuan River bears a significant amount of sewage input. Besides, FI showed a significant positive correlation with nitrate nitrogen (NO₃⁻-N), TN, TP, Chl-a, and TLI, while a significant negative correlation with WQI. The specific ultraviolet absorbance of 254 nm (SUVA₂₅₄) had a positive correlation with TLI. Indeed, the UVC humic-like component (C1) showed a significant positive correlation with the macroinvertebrates diversity. The humification index (HIX) was significantly negatively correlated with sediment pollution index. Our results suggested that DOM fluorescence characteristics had the potential to be developed as a convenient method for assessing aquatic ecological health.

河流中溶解有机物（DOM）的光谱特性被认为是河流健康状况的潜在指标。本研究探讨了石川河溶解有机物光谱特性与总氮（TN）、总磷（TP）、叶绿素a（Chl-a）含量、大型底栖无脊椎动物多样性、水质指数（WQI）、营养级指数（TLI）等河流生态健康指标之间的关系。根据 WQI 值，莒河和桃曲坡水库的水质总体好于其他河段，而清河和主流河段的水质最差。荧光指数（FI）和水质指数（WQI）反映出石川河主流有大量污水输入。此外，FI 与硝酸盐氮（NO3--N）、TN、TP、Chl-a 和 TLI 呈显著正相关，而与 WQI 呈显著负相关。254 纳米比紫外吸收率（SUVA254）与 TLI 呈正相关。事实上，紫外线腐殖样成分（C1）与大型无脊椎动物多样性呈显著正相关。腐殖化指数（HIX）与沉积物污染指数呈显著负相关。我们的研究结果表明，DOM 荧光特征有可能发展成为一种评估水生生态健康的便捷方法。

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引用次数: 0

Impacts of climate change and land Use/Cover change on ecological security networks in Changbai Mountains, Northeast China 气候变化和土地利用/覆盖变化对中国东北长白山生态安全网络的影响

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-14 DOI: 10.1016/j.ecolind.2024.112849

Jinyuan Ren , Wen J. Wang , Long Fei , Lei Wang , Shanfeng Xing , Yu Cong

A robust Ecological Security Network (ESN) is essential for protecting ecological security and promoting sustainable development within mountainous regions. These regions were highly sensitive to climate change and Land Use/Cover Change (LUCC), which could result in a degradation or even loss of ecosystem services and affect the structure and connectivity of ESN. Previous studies have paid relatively little attention to the construction and change of ESNs in these regions, particularly in distinguishing the individual (climate change or LUCC) effects and their interactive effects on ESN. In this study, we investigated the changes in the structure and connectivity of ESN in observed and projected periods and explored the impacts of climate change and LUCC on these changes through factor control experiments within the Changbai Mountain region. Our results showed an increase of 19.11% in the area of ecological sources and a 29.44% decrease in the length of corridors, accompanied by a decline in the connectivity of ESN over the past 30 years. The area of ecological sources was projected to decrease by 43.18%, while the length of corridors was expected to increase by 88.5%, with an overall increase in ESN connectivity in the next 30 years. We further found that the climate change and LUCC exhibited negative impacts on the structure and connectivity of ESN. Moreover, the changes in ESN structure were primarily attributed to LUCC effects, followed by climate change effects and their interactive effects. While the changes in ESN connectivity were significantly affected by climate change effects, followed by LUCC effects and their interactive effects. Notably, the interactive effects showed positive impacts on the ESN structure and connectivity. Our study offers important references for land management and policy formulation, aiming to preserve ecological security and ensure sustainable human development.

一个强大的生态安全网络（ESN）对于保护山区生态安全和促进可持续发展至关重要。这些地区对气候变化和土地利用/覆盖变化（LUCC）高度敏感，可能导致生态系统服务退化甚至丧失，并影响 ESN 的结构和连通性。以往的研究对这些地区生态系统网络的构建和变化关注相对较少，尤其是在区分单独效应（气候变化或土地利用/覆盖变化）及其对生态系统网络的交互效应方面。在本研究中，我们研究了长白山地区观测期和预测期 ESN 结构和连接性的变化，并通过因子控制实验探讨了气候变化和 LUCC 对这些变化的影响。结果表明，在过去的 30 年中，生态源面积增加了 19.11%，廊道长度减少了 29.44%，同时 ESN 的连通性也有所下降。预计未来 30 年，生态源面积将减少 43.18%，而走廊长度将增加 88.5%，ESN 的连通性总体上将增加。我们进一步发现，气候变化和 LUCC 对 ESN 的结构和连通性产生了负面影响。此外，ESN结构的变化主要归因于LUCC效应，其次是气候变化效应及其交互效应。而 ESN 连通性的变化则主要受到气候变化效应的影响，其次是 LUCC 效应及其交互效应。值得注意的是，交互效应对 ESN 结构和连通性产生了积极影响。我们的研究为土地管理和政策制定提供了重要参考，旨在维护生态安全和确保人类可持续发展。

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引用次数: 0

Landscape ecological risk assessment and driving factors analysis based on optimal spatial scales in Luan River Basin, China 基于最佳空间尺度的中国滦河流域景观生态风险评估及驱动因素分析

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-14 DOI: 10.1016/j.ecolind.2024.112821

Nijuan Yang , Ting Zhang , Jianzhu Li , Ping Feng , Nina Yang

Rapid urbanization and human activities have significantly influenced landscape ecological pattern and increased ecological risk. Landscape ecological risk (LER) assessment serves as an effective tool to capture the effects of natural evolution and human activities on ecosystems comprehensively, but the assessment result is subject to spatial scales. This paper figured out the optimal spatial scales of the Luan River Basin integrating response curves, area accuracy loss model, and semi-variation function under the appropriate resampling method. The improved landscape ecological risk index (ILERI) model was established to assess LER based on optimal spatial scales, employing spatial autocorrelation theory and Geodetector to reveal the spatio-temporal traits and influencing factors of LER. The results showed: (1) Nearest is the appropriate raster resampling method in landscape pattern analysis of Luan River Basin, and the optimal spatial granularity and amplitude are 30 m and 3200 m, respectively; (2) In 2000, 2008, 2016 and 2022, ILERI was 0.242, 0.249, 0.250 and 0.234, respectively, and LER levels were medium–low and medium predominantly, which accounted for 64.87 %, 52.28 %, 68.76 % and 70.55 %; (3) Recent data showed a decline in LER levels, with higher risks concentrated in the northwest and lower risks in the southeast. Precipitation, population density, and primary industry were the primary factors and the interaction of multiple factors played a more significant role. This study will provide reference for planning land use and managing ecological environment in the Luan River Basin.

快速城市化和人类活动极大地影响了景观生态格局，增加了生态风险。景观生态风险评估是全面把握自然演化和人类活动对生态系统影响的有效工具，但评估结果受空间尺度的制约。本文在适当的重采样方法下，综合响应曲线、面积精度损失模型和半变异函数，找出了滦河流域的最佳空间尺度。建立了基于最优空间尺度的改进景观生态风险指数（ILERI）模型，利用空间自相关理论和 Geodetector 揭示了 LER 的时空特征和影响因素。结果表明(1）在滦河流域景观格局分析中，Nearest是合适的栅格重采样方法，最佳空间粒度和振幅分别为30 m和3200 m；（2）2000年、2008年、2016年和2022年，ILERI分别为0.242、0.249、0.250和0.234，LER 水平以中低和中等为主，分别占 64.87%、52.28%、68.76%和 70.55%；（3）近期数据显示，LER 水平有所下降，风险较高的地区集中在西北部，风险较低的地区集中在东南部。降水、人口密度和第一产业是主要因素，多种因素的交互作用发挥了更重要的作用。本研究将为滦河流域土地利用规划和生态环境治理提供参考。

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引用次数: 0

Analyzing the structural elements, ecological characteristics, and impact assessment of local green infrastructure in the coastal zone of Estonia 分析爱沙尼亚沿海地区地方绿色基础设施的结构要素、生态特征和影响评估

IF 7 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Ecological Indicators

Pub Date : 2024-11-14 DOI: 10.1016/j.ecolind.2024.112824

V. Kaskevich , M. Villoslada , R.D. Ward , K. Sepp

The aim of this study was to address the gaps in understanding and managing the resilience and connectivity of coastal Green Infrastructure (GI) in Estonia, particularly in response to increasing human-related pressures and natural changes.

By using the GUIDOS Toolbox for morphological spatial pattern analysis, the study offers a detailed mapping of the structural patterns of GI across the Estonian coast. The findings highlight significant variations in forest cover, land abandonment, and the spread of impervious surfaces, showing how these changes contribute to the fragmentation of GI.

Our analysis revealed that the Northeast region suffers from severe fragmentation due to extensive industrial activities, whereas the Southwest is predominantly impacted by intensive agriculture, leading to reduced habitat connectivity. Despite having extensive protected areas, the Western Coast displayed large levels of fragmentation, primarily driven by unmanaged land abandonment and encroachment expansion. Specifically, the fragmentation index was highest in the industrialized Northeast and lowest in less developed areas, albeit still significant due to localized human activities. These findings highlight the importance of targeted GI planning that integrates ecological, socio-economic, and spatial dimensions to minimize fragmentation, enhance ecological corridors, and promote sustainable land-use practices. Strategic planning must also account for potential climate change impacts to ensure the resilience and adaptability of GI networks, securing ecosystem services and supporting both ecological and human communities.

这项研究的目的是解决在了解和管理爱沙尼亚沿海绿色基础设施（GI）的恢复力和连通性方面存在的差距，尤其是在应对日益增加的人为压力和自然变化方面。通过使用 GUIDOS 工具箱进行形态空间模式分析，这项研究提供了爱沙尼亚沿海绿色基础设施结构模式的详细图谱。我们的分析表明，东北部地区由于广泛的工业活动而遭受严重的破碎化，而西南部则主要受到集约农业的影响，导致栖息地的连通性降低。尽管西部沿海地区拥有广阔的保护区，但其破碎化程度却很高，主要原因是无人管理的土地撂荒和侵占扩张。具体而言，工业化东北部的破碎化指数最高，欠发达地区的破碎化指数最低，但由于局部地区的人类活动，破碎化指数仍然很高。这些发现凸显了综合生态、社会经济和空间维度进行有针对性的地理信息系统规划的重要性，以最大限度地减少破碎化、加强生态走廊并促进可持续的土地利用方式。战略规划还必须考虑到潜在的气候变化影响，以确保 GI 网络的复原力和适应性，确保生态系统服务并支持生态和人类社区。

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引用次数: 0