Ecohydrology & Hydrobiology最新文献

{"title":"Scaling up analysis of human impacts on hydrological connectivity in Mediterranean viticultural landscapes: From hillslope to a watershed perspective","authors":"Laura Cambronero ,&nbsp;Yang Yu ,&nbsp;Jesús Rodrigo-Comino","doi":"10.1016/j.ecohyd.2025.100700","DOIUrl":"10.1016/j.ecohyd.2025.100700","url":null,"abstract":"<div><div>In land management and precision viticulture (PV), the integration of Geographic Information Systems (GIS) and remote sensing has enabled the detailed study of geomorphological processes and hydrological patterns across multiple scales. Despite its potential, this approach remains underutilized compared to applications like pest control, disease detection, and vegetation assessment. This research addresses this gap by proposing a multiscale fluvio-geomorphological and hydrological analysis to enhance sustainable soil management and vineyard conservation. Using open-access national remote sensing data (Digital Surface Models) and drone-based imagery, a 48 km² watershed and a 1 km-long vineyard plantation were analyzed. The results revealed an elongated watershed with steep slopes and high drainage density, influencing sediment deposition and flow direction, which directly affect the vineyard plantation. The watershed exhibited a predominant northward flow (26.2 %), while vineyard-level flows varied, primarily toward the east (20 %) and northwest (16.5 %), affecting the roads, and flow paths. The Index of Connectivity (IC) highlighted higher hydrological connectivity in the vineyard, with 85.4 % classified as high IC, compared to 18.1 % in the broader watershed. These findings highlight the need to incorporate geomorphological processes into PV and land management to avoid misunderstandings. By analyzing hydrological connectivity and sediment transport at multiple scales, this study reinforces the understanding of the processes that shape vineyard landscapes and provides a basis for future research aimed at integrating this knowledge into soil conservation and sustainable management strategies.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100700"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Connecting the dots: Spatial connectivity and ecological dynamics in a tropical river catchment","authors":"Grite Nelson Mwaijengo","doi":"10.1016/j.ecohyd.2025.100698","DOIUrl":"10.1016/j.ecohyd.2025.100698","url":null,"abstract":"<div><div>The unique branching geometry of river networks distinguishes them from other ecological systems and strongly influences key ecological processes. Yet, models that explicitly account for dendritic structure and flow direction remain underused. We applied a spatial stream network model (SSNM) to examine spatial patterns of water chemistry and benthic macroinvertebrates in the Usa-Kikuletwa River catchment, northeastern Tanzania, using data from 40 monitoring sites. SSNMs incorporate hydrologic distances among flow-connected, flow-unconnected, and Euclidean sites, enabling explicit representation of river network dependencies. We found spatial autocorrelation in both water chemistry and macroinvertebrate indices at fine (≤2 km) and broad (&gt;10 km) scales. SSNMs explained up to 31.7% of variance, outperforming Euclidean models. Broad-scale tail-up (upstream flow-connected) models highlighted the role of upstream processes and hydrological connectivity in water chemistry, while tail-down (downstream-directed) models better explained macroinvertebrate variation, suggesting influences of dispersal, drift, and broad-scale landscape factors. Our findings demonstrate the utility of SSNMs for capturing dendritic spatial dependencies and improving predictions in Afro-tropical river systems.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100698"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Spatiotemporal response of water balance components under projected land use/land cover change in the Upper Omo-Gibe River Basin, Ethiopia","authors":"Paulos Lukas ,&nbsp;Assefa M. Melesse ,&nbsp;Tadesse Tujuba Kenea","doi":"10.1016/j.ecohyd.2025.100689","DOIUrl":"10.1016/j.ecohyd.2025.100689","url":null,"abstract":"<div><div>The evaluation of a river basin's water balance and related hydrological processes is crucial for managing, monitoring, and predicting water resources as well as using them sustainably. The main objective of this study is to model and evaluate the response of hydrological components to land use/land cover dynamics via hydrological and remote sensing techniques in the Upper Omo-Gibe River Basin, Ethiopia. The sensitive parameters for the model simulation were thoroughly examined and selected. The findings provide significant information on the response of water balance components to LULC change. Between 1997 and 2004, it was observed that the primary factors accelerating the transformation were a rapid increase in agricultural land (46.89 %) and a significant loss of forest cover. Surface runoff (Surf_Q) increased a (4.7 %); increase whereas groundwater recharge (Gw_Q) and lateral flow (Lat_Q) decreased (17.63 %) and (9.54 %), respectively. The model simulation results revealed that surface runoff, evapotranspiration, lateral flow, and groundwater recharge accounted for 22.07 %, 43.95 %, 0.83 %, and 28.88 %, respectively, of the total flow in the present study. The increase in impervious surfaces due to intensified land competition among various sectors contributes to the reduction in the infiltration of water into the ground and accelerates Surf_Q in the catchment. Therefore, local, regional, and national policy interventions are needed to ensure efficient planning for water resource management in the Gibe-III catchment of the Omo-Gibe River Basin.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100689"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"From deficit to balance: Identifying blue-green infrastructure networks based on trade-offs and synergies between water and terrestrial ecosystem services in a water sensitive region","authors":"Yajie Yang ,&nbsp;Qiwei Ma","doi":"10.1016/j.ecohyd.2025.100656","DOIUrl":"10.1016/j.ecohyd.2025.100656","url":null,"abstract":"<div><div><span>Rapid urbanization has led to the expansion of urban construction land, severely disrupting the stability of water and terrestrial ecosystems. Effectively balancing water ecosystem and terrestrial ecosystem has become a critical issue for high-quality urban development. This study focuses on the Ecological Green Integration Demonstration zone (EGIDZ) in the Yangtze River Delta, China as the research area. This research first establishes a comprehensive ES evaluation system from the perspectives of water ecosystem services (ESs) and terrestrial ESs, and evaluates them using the InVEST model. Secondly, hotspot analysis is employed to analyze the spatial clustering characteristics of the comprehensive water ESs and terrestrial ESs. Using the four-quadrant model, a coordinate system was established with water ES as the X-axis and terrestrial ES as the Y-axis, classifying the study area into four types: high water ES-high terrestrial ES, high water ES-low terrestrial ES, low water ES-high terrestrial ES, and low water ES-low terrestrial ES. Hotspot analysis was conducted using ArcGIS 10.8 to extract the spatial relationships between water-terrestrial hotspots and coldspots, which were then mapped onto the four-quadrant model. Based on Z-values, hotspot areas (</span><em>Z</em> &gt; 1.65) were categorized as surplus areas, coldspot areas (<em>Z</em><span> &lt; -1.65) as deficit areas, and non-significant areas as balance areas. Third, based on an analysis of ESF directions, hubs are extracted by assessing the characteristics of supply-demand between surplus and deficit areas. Then, using circuit theory, the BGIN is constructed based on hubs and resistance surface. The resistance surfaces include a water resistance surface and a terrestrial resistance surface, both of which are constructed by equally weighting and overlaying three resistance factors with comparable influence. This facilitating ecological flows from surplus hubs to deficit hubs and achieving a dynamic balance between them. Finally, ecological management zoning was conducted for sustainable ecological protection and urban development. Results identified 147 water-dominated ESFs and 148 terrestrial-dominated ESFs, forming a uniform network structure. Stability and connectivity tests through random and targeted attacks confirm that BGIN exhibits greater resilience and connectivity than only blue or green infrastructure networks.</span></div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100656"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"The impact of small water reservoirs on the concentration of pollutants in a stream in an urbanised area","authors":"Roman Cieśliński ,&nbsp;Marlena Pawłowska ,&nbsp;Bartosz Jagielski ,&nbsp;Katarzyna Kubiak-Wójcicka ,&nbsp;Agnieszka Pilarska","doi":"10.1016/j.ecohyd.2025.100678","DOIUrl":"10.1016/j.ecohyd.2025.100678","url":null,"abstract":"<div><div>Water reservoirs and small streams located in urban areas are subject to strong pressure as a result of human activity. This study focuses on an urban stream located in the city of Gdansk (Poland). Field studies were conducted monthly within 7 measurement profiles located on the tributaries and outflows of water reservoirs located on the route of the Orunski Stream. They included measurements of water flow rate and collection of water samples for physicochemical analyses. The results showed that the pollutant loads in the individual measurement profiles were seasonally variable. The highest concentrations of total nitrogen, total phosphorus, chlorides and specific conductivity values were recorded in the tributary of the Orunski Stream, i.e. the Kozacki Stream. A decrease in monthly nitrogen and phosphorus loads was recorded in the profiles along the Orunski Stream downstream, below the water reservoirs, due to the loads accumulating in three reservoirs. Three components influencing water quality were identified: the location of the landfill, the Tri-City bypass, and the runoff of pollutants from agricultural and urban areas. The results obtained are important for the stream manager and the needs of future revitalization of water reservoirs.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100678"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145738788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Sub-basins identification and prioritization for ecohydrological nature-based intervention","authors":"Nigatu Chala ,&nbsp;Yenesew Mengiste ,&nbsp;Yohannes Zerihun","doi":"10.1016/j.ecohyd.2025.100675","DOIUrl":"10.1016/j.ecohyd.2025.100675","url":null,"abstract":"<div><div><span>Sub-basin identification and prioritization are critical steps in addressing ecohydrological challenges, optimizing nature-based water conservation strategies, and study rainfall-runoff processes. In Ethiopia, the intense summer rainy season frequently triggers flood hazards, particularly in the Upper Awash River Basin. To mitigate these risks, detailed sub-basin assessments are essential for designing targeted intervention, such as nature-based flood management solutions. This study employed an integrated approach combining hydrological modeling, geospatial analysis, multi-criterial decision-making (MCDM), and ranking score number techniques. The HEC</span><img><span><span>HMS software was used to simulate rainfall runoff processes and divide the study area into sub-basins using a Digital Elevation Model (DEM). ArcGIS tools processes satellite imagery and environmental parameters to reclassify and analyze spatial data for sub-basins. The </span>analytical Hierarchy process (AHP), implemented via R packages, assigned weights to the parameter. Then, a compound weighted rank score number (WRSN) system applied to rank sub-basins. Sub-basin-2 received the lowest composite number score marking it as the highest priority for intervention. In contrast, sub-basin-1 scored the highest, indicating lower urgency. The HEC HMS rainfall-runoff simulation showed strong agreement with observed data at outlet points. Performance metrics confirmed the model ‘s reliability: RMSE, NSE, percent Bias, and R</span>²<span> were found to be 0.28,0.92, 1.02, and 0.93 at sink of the study area respectively. This methodology provides a robust framework for identifying priority sub-basins, enabling policy makers and conservationists to allocate resources effectively.</span></div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100675"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145738916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Hydrological effects of three plantations in hilly regions of South China","authors":"Qian Wang ,&nbsp;Ping Zhao ,&nbsp;Xia Chen ,&nbsp;Xiuhua Zhao ,&nbsp;Liwei Zhu","doi":"10.1016/j.ecohyd.2025.100648","DOIUrl":"10.1016/j.ecohyd.2025.100648","url":null,"abstract":"<div><div>Exotic broadleaf <span><em>Acacia </em><em>mangium</em></span> Willd., native broadleaf <em>Schima wallichii</em> Choisy, and native coniferous <span><em>Cunninghamia lanceolata</em></span><span><span> (Lamb.) Hook are main species for vegetation restoration<span><span> in southern China. To assess whether these plantations remain suitable for continued planting after more than 30 years on degraded hilly lands, we investigated the hydrological effects of their canopy, litter, and soil layers. Canopy interception was calculated by subtracting measured </span>throughfall and </span></span>stemflow from total rainfall, while the water-holding capacities of litter and soil were measured using indoor immersion and ring knife methods, respectively. Our results show that the hydrological effects of the canopy and litter layers in the two broadleaf plantations were superior to those in the coniferous </span><em>C. lanceolata</em> plantation. In 2017 and 2018, the canopy interception/precipitation ratios ranked: <em>S. wallichii</em> (13.1–20.7%)&gt; <em>A. mangium</em> (16.2–10.2%) &gt; <em>C. lanceolata</em> (11.3–11.6%). Among the three plantations, the native broadleaf species <em>S. wallichii</em><span> exhibited the highest canopy interception under extreme rainfall, suggesting it may be better suited for afforestation in southern China, where extreme rainfall events are becoming increasingly frequent. For the total effective water storage capacity of litter, the ranking was: </span><em>A. mangium</em> (4.6±2.4 t·hm⁻²) &gt; <em>S. wallichii</em> (2.7±1.8 t·hm⁻²) &gt; <em>C. lanceolata</em> (2.4±1.4 t·hm⁻²). Exotic <em>A. mangium</em> had the highest water-holding capacity in both undecomposed and decomposed litter layers, and its soil water-holding capacity was superior to the native species. These results indicate that <em>A. mangium</em><span><span> improves hydrological functions in litter and soil layers, conserving water, delaying surface runoff, and reducing soil erosion, while its potential invasive risks to biodiversity and ecosystem stability should also be considered. For average </span>soil water storage capacity, the ranking was: </span><em>A. mangium</em> (6373.0±54.4 t hm^-2) &gt; <em>C. lanceolata</em> (5955.1±43.0 t hm^-2) &gt; <em>S. wallichii</em> (5909.8 ±102.4 t hm^-2). Since there were no significant differences in soil hydrological effects between <em>S. wallichii</em> and <em>C. lanceolata, C. lanceolata</em> exhibited the weakest overall hydrological benefits. Our findings highlight the critical importance of selecting appropriate species for afforestation projects to optimize hydrological functions and adapt to changing rainfall patterns in southern China.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100648"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145738920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Effects of diclofenac, ibuprofen, ionic liquid and drug-IL mixtures on various environmental elements","authors":"Barbara Pawłowska","doi":"10.1016/j.ecohyd.2025.100671","DOIUrl":"10.1016/j.ecohyd.2025.100671","url":null,"abstract":"<div><div><span>Ionic liquids (ILs) are a large group of compounds that have found applications in the pharmaceutical industry, including as solvents, or as part of API (active pharmaceutical ingredient) and IL combinations to improve drug properties. However, to date, there have been no studies to determine the simultaneous environmental effects of ILs and pharmaceuticals. Therefore, the present study was designed to determine and compare the toxicity of drugs: ibuprofen (IBU) and diclofenac (DIC) and the ionic liquid 1‑butyl‑3-methylimidazolium chloride (BMIMCl), as well as drug-ILs mixtures on 6 test organisms (</span><span><span><span><em>Sorghum saccharatum, </em><span>Lepidium sativum</span><em>, </em></span><span>Sinapis alba</span><em>, </em></span><em>Spirodela polyrhiza</em><span><em>, </em><span>Daphnia magna</span><em>, Heterocypris incongruens</em></span></span>) using biotests. The results indicate that the compounds tested may have negative effects on the test organisms. The greatest effect of the tested compounds was on the inhibition of leaf growth of <em>Spirodela polyrhiza</em>. The magnitude of the effect of each compound depended on the type of compound, the concentration used and the species of organism on which the compound or mixture acted.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100671"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145738952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Artificial islands supporting migratory bird populations as potential sources of microinvertebrate dispersal","authors":"Łukasz Sługocki ,&nbsp;Urszula Mordacz ,&nbsp;Łukasz Jankowiak ,&nbsp;Sebastian Michałowski ,&nbsp;Robert Czerniawski ,&nbsp;Dominik Marchowski","doi":"10.1016/j.ecohyd.2025.100660","DOIUrl":"10.1016/j.ecohyd.2025.100660","url":null,"abstract":"<div><div><span><span>Estuarine waters are key hotspots for the introduction and spread of invasive species<span>. The construction of two artificial islands in the Oder Estuary (Central Europe) in 2021 created new habitats that have attracted a diverse range of species, including </span></span>aquatic invertebrates and migratory birds. This study investigates the role of these islands in facilitating the dispersal of microinvertebrates and their potential contributions to local biodiversity. Zooplankton samples were collected from ponds on the islands and nearby lagoon waters, revealing significant differences in species composition. The pond on Brysna Island exhibited a higher zooplankton abundance than the pond on Śmięcka Island, likely due to variations in nutrient levels and hydrological connectivity with the lagoon. The dominance of species such as </span><span><em>Eurytemora</em><em> carolleeae</em></span> and <span><em>Acanthocyclops</em><em> trajani</em></span> suggests that these artificial habitats may facilitate the establishment of invasive or expansive taxa. The presence of <span><em>Daphnia magna</em></span><span>, rarely found in estuarine environments, highlights the unique conditions of these isolated ponds, where low fish predation supports its occurrence. Migratory birds may play a crucial role in dispersing these microinvertebrates, potentially transporting resting eggs or cysts across regions. The study suggests that these artificial islands, situated along a major bird migration route, could contribute to the spread of non-native, potentially invasive species throughout the region. These findings highlight the need to monitor artificial habitats, as they may impact regional biodiversity. Further research is required to assess the ecological effects of these islands, particularly their role in species dispersal and invasion dynamics.</span></div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100660"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Relationship between microbial community and environmental factors in the sediments of the perennial backwater region of the three gorges reservoir","authors":"Chang Han ,&nbsp;Xiaomin Wang ,&nbsp;Zhiyuan Chen ,&nbsp;Yue Chen ,&nbsp;Wangmin Zhou ,&nbsp;Shumeng Lu ,&nbsp;Wenjun Yang","doi":"10.1016/j.ecohyd.2025.100644","DOIUrl":"10.1016/j.ecohyd.2025.100644","url":null,"abstract":"<div><div><span><span>The processes of bacterial community assembly in the Three Gorges Reservoir remain largely unknown. Elucidating the community formations and successions, and characterizing their taxonomy and </span>functional diversity<span><span>, is important. The complex interactions between bacteria and environmental factors affecting their distribution and activity are not fully understood. An understanding of these interactions is essential for predicting and managing the ecological health of this critical freshwater system. In this research, through measuring the physicochemical properties of the sediments in the </span>perennial<span><span> backwater area of the Three Gorges Reservoir, in combination with 16S rRNA high-throughput sequencing analysis and </span>metagenomic<span> sequencing analysis, the microbial diversity, the bacterial assembly process, the bacterial species and functional composition structure in the sediments of this area were explored, and the interrelationship between the bacterial community and environmental factors was analyzed. The results indicated no significant differences in the alpha diversity of bacterial species and gene functions within the sediments of this area. Spatial distance is the major factor leading to differences in bacterial species and gene functions. The bacterial assembly process was predominantly driven by stochastic events. The bacterial abundance in the area ranges from 4.87 × 10</span></span></span></span>⁸ to 1.39 × 10⁹ copies/g, and the intensity of the bacterial assembly process is influenced by the size of the bacterial community. The dominant bacterial phyla varied slightly between sampling points, with Proteobacteria consistently emerging as the predominant phylum, and the variation in gene functions between sampling points was minimal. Total nitrogen (TN) content was the primary environmental determinant of bacterial community composition, whereas ammonium (NH₄⁺) content was the main factor influencing bacterial growth and reproduction. A negative correlation was observed between bacterial species richness and functional diversity, indicating a mismatch between these two aspects.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100644"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145738781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}