Ecohydrology & Hydrobiology最新文献_第8页

Rainfall partitioning of tree species in a seasonally dry forest in a semiarid region of Brazil 巴西半干旱地区季节性干旱森林树种的降雨分配

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.2025.100645

Carlos André Alves de Souza , Alexandre Maniçoba da Rosa Ferraz Jardim , Luciana Sandra Bastos de Souza , José Edson Florentino de Morais , George do Nascimento Araújo Júnior , Cleber Pereira Alves , Daniela Carvalho Lopes , Antonio José Steidle Neto , Gabriel Ítalo Novaes da Silva , Wilma Roberta dos Santos , Elisiane Alba , Ênio Farias de França e Silva , Alexsandro Oliveira da Silva , Thieres George Freire da Silva

The rainfall distribution in seasonally dry tropical forests is fundamental to the water balance in several world regions. This study aimed to quantify rainfall partitioning by the Caatinga Biome, and its relationship with the rainfall characteristics and morphological characteristics of seven species. The study was conducted in the Brazilian semiarid region, from November 2017 to December 2020. Rainfall partitioning was measured to determine internal precipitation (Tf), stemflow (Sf) and interception (I), and to analyse the relationship with total rainfall, intensity and duration, and with tree characteristics: plant height; number of stems; diameter at breast height; and crown projection area. A total of 167 rainfall events were identified with Tf, Sf and I accounting for 83.1 %, 0.5 % and 16.4 % of the total rainfall. The amount of rainfall varied from 1 to 141 mm (mean of 12 mm). Duration ranged from 0.17 to 9.17 h (mean of 1.78 h), while rainfall intensity ranged from 1.2 to 27.6 mm h⁻¹ (mean of 5.9 mm h⁻¹). There were variances in rainfall partitioning between the species, with Aspidosperma pyrifolium showing the greatest I (21.0 %). Rainfall characteristics affected the Tf, Sf and I, more than the morphological characteristics of trees for some species. However, the results of regression analysis showed that Tf, Sf and I were most correlated with amount of rainfall (0.20 < R² < 0.90; p < 0.001). The rainfall partitioning according to the predominant tree species should be considered in seasonally dry forests in the semiarid region of Brazil to improve water resource management.

季节性干燥热带森林的降雨分布对世界上一些地区的水平衡至关重要。本研究旨在量化Caatinga生物群系的降雨分配，及其与7个物种的降雨特征和形态特征的关系。该研究于2017年11月至2020年12月在巴西半干旱地区进行。通过测量降雨分配来确定内部降水量（Tf）、茎流（Sf）和截留量(I)，并分析与总降雨量、强度和持续时间以及树木特征的关系：株高；茎数；胸围高度的直径；和树冠投影面积。共鉴定出167个降雨事件，其中Tf、Sf和I分别占总降雨量的83.1%、0.5%和16.4%。雨量由1至141毫米不等（平均12毫米）。持续时间为0.17 ~ 9.17 h（平均1.78 h），降雨强度为1.2 ~ 27.6 mm h - 1（平均5.9 mm h - 1）。不同树种间的降雨分配存在差异，以梨叶穗轴草的降雨分配最大（21.0%）。降雨特征对水分、水分和水分的影响大于某些树种的形态特征。然而，回归分析结果显示，Tf、Sf和I与降雨量的相关性最强（R2 < 0.20; p < 0.001）。巴西半干旱区季节性干旱森林应考虑根据优势树种进行降雨分配，以改善水资源管理。

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引用次数: 0

Green transformation pathways in the water sector under the ‘Dual carbon’ framework: a case study of anhui province, East China “双碳”框架下水务行业绿色转型路径研究——以安徽省为例

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.2025.100692

Shuguang Zhu , Changqing Wang , Mengqi He , Wei Wei , Binyu Chen , Yuqi Feng , Yun Wan

Under the dual backdrop of global climate change and the "dual carbon" goals, the water industry, as a significant sector in terms of energy consumption and carbon emissions, urgently needs systematic research on its green transformation path. This paper takes Anhui Province in East China as an example to construct a full life cycle carbon emission accounting framework covering the three major systems of water supply, sewage and stormwater, and clarifies the system boundaries and accounting methods. Research shows that the carbon emissions of the water affairs system in Anhui Province mainly come from electricity consumption and material usage, among which the sewage system contributes the most. Meanwhile, this study proposes differentiated emission reduction strategies: The water supply system can achieve emission reduction of approximately 2.35 × 10⁸ kg CO₂-eq through water conservation and pipe network leakage control; The sewage system, through process upgrading, recovery of waste heat energy and energy utilization of sludge, has an emission reduction potential of approximately 3.92 × 10⁹ kg CO₂-eq. Through the rainwater and sewage separation renovation and the construction of sponge cities, the rainwater system can further contribute 5.22 × 10⁷ kg of CO₂-eq carbon sink benefits. Comprehensive assessment indicates that the annual emission reduction potential of the water affairs system in Anhui Province is approximately 7–8 × 10⁸ kg CO₂-eq, significantly supporting the realization of the regional "dual carbon" goals. This study provides methodological support and practical path references for carbon accounting and green transformation of urban-scale water systems.

在全球气候变化和“双碳”目标的双重背景下，水务行业作为能源消耗和碳排放的重要行业，迫切需要对其绿色转型路径进行系统研究。本文以华东地区安徽省为例，构建了覆盖供水、污水、雨水三大系统的全生命周期碳排放核算框架，明确了系统边界和核算方法。研究表明，安徽省水务系统碳排放主要来源于电力消耗和物质使用，其中污水系统碳排放贡献最大。同时，本研究提出了差异化的减排策略：供水系统通过节水和管网渗漏控制，可实现约2.35 × 10⁸kg CO₂-eq的减排；污水系统通过工艺升级、余热回收和污泥能源利用，减排潜力约为3.92 × 10⁹kg CO₂-eq。通过雨水和污水分离改造和海绵城市建设，雨水系统可以进一步贡献5.22 × 10⁷kg CO₂-eq碳汇效益。综合评价表明，安徽省水务系统年减排潜力约为7-8 × 10⁸kg CO₂-eq，显著支持了区域“双碳”目标的实现。本研究为城市尺度水系碳核算和绿色转型提供了方法支持和实践路径参考。

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引用次数: 0

Conservation and sustainable use of water facing the climate emergency: The need for a polycentric and networked governance 面对气候紧急情况的水资源保护和可持续利用：多中心和网络化治理的必要性

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.2025.100707

F.A.R. Barbosa , C. d’Andrea , V.S.T. Ciminelli , H.S.M. Costa , E.F. Mortimer , F.C. Sá Barreto , R. Takahashi

We critically examine the current state of aquatic ecosystems, highlighting the escalating demands and the multifaceted impacts faced by them and their biotas. Special emphasis is placed on peculiarities of key sectors capable of producing major impacts, namely: agribusiness, mining, inadequate health and basic sanitation, and technological infrastructures. The urban perspective was also incorporated in the analysis, addressing a projected future of cities and their interactions with water resources, emphasizing the pursuit of sustainability in the context of urbanization, since approximately 70 % of the global population resides in urban areas. The article provides an overview of the major impacts of climate change on aquatic ecosystems, projecting that these effects will become increasingly severe, spatially concentrated, and frequent. To underscore the critical need for action, we advocate for substantial investments in conservation initiatives to restore ecological balance of aquatic ecosystems within planetary limits. Recognizing water as the essential foundation of life on Earth demands particular attention and the urgency for its sustainable use. A polycentric and networked governance, yet to be built, is our suggestion as an effective approach to optimize adaptive actions to face climate change and to realign aquatic ecosystems within planetary boundaries.

我们批判性地审视了水生生态系统的现状，强调了不断升级的需求以及水生生态系统及其生物群所面临的多方面影响。特别强调能够产生重大影响的关键部门的特点，即：农业综合企业、采矿、保健和基本卫生设施不足以及技术基础设施。城市视角也被纳入分析，讨论城市未来的预测及其与水资源的相互作用，强调在城市化背景下追求可持续性，因为全球约70%的人口居住在城市地区。本文概述了气候变化对水生生态系统的主要影响，并预测这些影响将变得越来越严重、空间集中和频繁。为了强调采取行动的迫切需要，我们主张对保护倡议进行大量投资，以在地球限度内恢复水生生态系统的生态平衡。认识到水是地球上生命必不可少的基础，需要特别注意并迫切需要可持续地利用水。我们建议建立一个多中心和网络化的治理，作为优化适应行动以应对气候变化和在地球范围内重新调整水生生态系统的有效方法。

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引用次数: 0

Agricultural expansion and possible effects on hydrological services: a case study of the MATOPIBA Region, Brazil 农业扩张及其对水文服务的可能影响：以巴西MATOPIBA地区为例

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.2025.100693

Hugo de Carvalho Ricardo , Thaís da Silva Charles , Tárcio Rocha Lopes , Fernando Campos Mendonça , Ronalton Evandro Machado , Sergio Nascimento Duarte

Despite a 70 % drop in the annual deforestation rate in the Amazon during the 21st century, the Cerrado has experienced a reduction of approximately 88 Mha (46 %) of its native vegetation, with projections that 31–34 % of the remaining biome could be deforested by 2050. The area converted from native vegetation to new arable land in the Cerrado during this century was approximately 2.5 times larger than the area converted in the Amazon, with the MATOPIBA region accounting for more than half of this new arable land. This study aimed to evaluate the effects of land use and land cover changes on the hydrological services of the MATOPIBA region and identify the most relevant factors influencing the behavior of these services. The hydrological data used in this study were obtained from the Hydrological Information System of Brazil’s National Water Agency. The images used to identify changes in land use and land cover were acquired through the MapBiomas platform. The following hydrological service indices were determined based on annual hydrological data: base flow index and water yield (water availability), direct runoff coefficient, and flashiness (protection). The results indicated changes in the annual trends of hydrological services in 16 out of the 32 studied river basins, with 62.5 % of the changes occurring in the portion of the state of Bahia. Correlations were found between changes in hydrological service indicators as a function of land use and land cover. Average pluvial precipitation and the increase in irrigation practices may also have influenced the results.

尽管21世纪亚马逊地区的年森林砍伐率下降了70%，但塞拉多地区的原生植被减少了约88亿公顷（46%），预计到2050年，剩余生物群系的31 - 34%可能会被砍伐。本世纪以来，塞拉多地区从原生植被转化为新耕地的面积大约是亚马逊地区转化面积的2.5倍，其中MATOPIBA地区占新耕地的一半以上。本研究旨在评估土地利用和土地覆盖变化对MATOPIBA地区水文服务的影响，并确定影响这些服务行为的最相关因素。本研究中使用的水文数据来自巴西国家水务局的水文信息系统。用于识别土地利用和土地覆盖变化的图像是通过MapBiomas平台获取的。根据年度水文数据确定了以下水文服务指标：基流指数和产水量（水分有效性）、直接径流系数和闪光度（保护）。结果表明，在研究的32个流域中，有16个流域的水文服务的年趋势发生了变化，其中62.5%的变化发生在巴伊亚州的部分地区。水文服务指标的变化与土地利用和土地覆盖之间存在相关性。平均降水和灌溉方式的增加也可能影响了结果。

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引用次数: 0

Enhancing streamflow predictions in coastal watersheds with a multisite calibration approach in the matagorda bay watershed, texas 得克萨斯州马塔戈达湾流域多站点校准方法增强沿海流域的流量预测

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.2025.01.003

Nigus Demelash Melaku , Anoop Valiya Veettil , Ali Fares , Ripendra Awal

Hydrological modeling is challenging in coastal watersheds compared to inland watersheds due to the inherent complexity. Soil and Water Assessment Tool (SWAT), a physically distributed hydrological model, was employed to simulate the streamflow and water availability using a multisite calibration algorithm to effectively capture the historical and future water availability in the Matagorda Bay watershed, Texas. The ensembled Global Climate Models (GCMs) data indicates that the Matagorda Bay Watershed will be dryer towards the end of the 21^st century compared to the base period (2000 – 2021). Between 2081 and 2099, the projected mean temperature changes under Representative Concentration Pathway (RCP) 8.5 are expected to range from 3.54°C to 4.55°C. The simulation results from the multisite calibration approach evaluated using metrics such as R², NSE, PBIAS, and KGE during the calibration and validation periods, demonstrated good model performance in predicting streamflow in the Matagorda Bay watershed. Future projected streamflow indicates a decrease of 23% under RCP4.5, with a potential reduction up to 54.6% under RCP8.5. These findings suggest that the multisite calibration in the SWAT model is more effective at representing the hydrological process in complex coastal watersheds compared to the single-site calibration.

与内陆流域相比，沿海流域水文建模由于其固有的复杂性而具有挑战性。采用物理分布式水文模型SWAT (Soil and Water Assessment Tool)，利用多站点校准算法模拟了德克萨斯州Matagorda湾流域的河流流量和水可用性，从而有效地捕捉了该流域的历史和未来水可用性。综合全球气候模式（GCMs）数据表明，与基期（2000 - 2021年）相比，到21世纪末，Matagorda湾流域将更加干燥。在2081年至2099年间，代表性浓度路径（RCP） 8.5下预估的平均温度变化预计在3.54°C至4.55°C之间。在校准和验证期间，使用R²、NSE、PBIAS和KGE等指标对多站点校准方法的模拟结果进行了评估，表明模型在预测Matagorda湾流域的流量方面具有良好的性能。未来预测流量在RCP4.5下减少23%，在RCP8.5下可能减少54.6%。这些结果表明，SWAT模型中的多点定标比单点定标更能有效地表征复杂沿海流域的水文过程。

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引用次数: 0

Water resource and sediment yield response under the dynamics of historical and future climate change in Ethiopia 埃塞俄比亚历史和未来气候变化动态下的水资源和产沙量响应

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.2025.100658

Meseret Bekele Toma , Merihun Fikiru Meja

The purpose of this study is to assess how climate change may affect the water resource components (WRC) and sediment yield (SED) of the Ajora-Woybo watershed in Ethiopia's Omo-Gibe basin. In the watershed, it is yet unknown how WRC and SED will react to climate change. Historical and future climate data were employed using station data and CORDEX-Africa data output under representative concentration pathway (RCP) scenarios (RCP4.5 and RCP8.5). The Soil and Water Assessment Tool (SWAT) is used to assess changes in WRC and SED to climate change. The results show that changes in annual, monthly, and seasonal water resource and sediment yield are consistent with historical and predicted changes in rainfall patterns over the future years. The estimated and predicted future annual and seasonal (Belg and Bega) flow magnitude will decrease while seasonal (kiremt) flow will increase compared to the reference era. These variations follow the course of shifting rainfall. ET increased during the historical and two future periods, although annual WRC and SED decreased. During the future era, ET increased by as much as 11.6 % under RCP8.5, while surface runoff decreased by 3.1 to 6.2 % and 4.8 to 6.7 % under RCP4.5 and RCP8.5, respectively. Changing rainfall patterns and magnitudes are expected to disrupt the WRC directly, while temperature changes are expected to have an indirect impact. For the farmers in the watershed whose only source of income is agriculture, this could mean that there will be less water available in the future, which would become a persistent issue.

本研究的目的是评估气候变化如何影响埃塞俄比亚Omo-Gibe盆地Ajora-Woybo流域的水资源成分（WRC）和产沙量（SED）。在流域，WRC和SED将如何应对气候变化还不得而知。在代表性浓度路径（RCP）情景（RCP4.5和RCP8.5）下，利用台站数据和CORDEX-Africa数据输出的历史和未来气候数据。利用水土资源评估工具（SWAT）评估WRC和SED对气候变化的影响。结果表明，年、月、季水资源产沙量的变化与未来几年降水模式的历史和预测变化一致。与参考时代相比，估计和预测的未来年和季节（Belg和Bega）流量将减小，而季节（kiremt）流量将增加。这些变化随降雨的变化而变化。在历史和未来两个时期，蒸散发增加，而年WRC和SED减少。在RCP8.5和RCP8.5下，地表径流量分别减少了3.1 ~ 6.2%和4.8 ~ 6.7%，而ET增加了11.6%。降雨模式和量级的变化预计将直接扰乱WRC，而温度变化预计将产生间接影响。对于流域内唯一的收入来源是农业的农民来说，这可能意味着未来可用的水将会减少，这将成为一个持久的问题。

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引用次数: 0

Spatio-temporal dynamics of tropical phytoplankton communities in the diverse coastal environments of southwestern India: HPLCCHEMTAX approach 印度西南部不同沿海环境中热带浮游植物群落的时空动态：HPLCCHEMTAX方法

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.2025.100684

Anil P , Madhu NV , Vishal CR , Arya KS , Praveena Sudheesh

A comprehensive investigation on phytoplankton community composition, utilizing HPLC-derived biomarker pigments and CHEMTAX analysis, was conducted in the Chandragiri Estuary (CGE) and adjacent nearshore waters (<20 m, off Kasaragod) along the southwest coast of India during 2018–2019. The CGE exhibited highly dynamic hydrographic conditions, which were reflected in the pronounced spatio-temporal variability of its phytoplankton communities. During non-monsoon periods, particularly the winter monsoon (WM) and spring-inter monsoon (SIM), the estuary was characterized by warm ( >29 °C), well-mixed, polyhaline to euhaline waters (28–35) and relatively elevated concentrations of key nutrients, including ammonium, nitrate and phosphate, These conditions supported moderately high concentrations of chlorophyll a (Chl a) in the CGE, averaging 2.14 ± 0.65 mgm⁻³ during WM and 1.78 ± 0.45 mg m⁻³ during SIM. In contrast, the summer monsoon (SM) period was marked by the influx of cooler (<26 °C), turbid freshwaters, which significantly suppressed phytoplankton biomass, resulting in exceptionally low Chl a levels (<0.2 mg m⁻³) throughout the estuary. In the adjacent nearshore waters, the Chl a concentrations remained consistently low (<1 mg m⁻³) across all seasons. CHEMTAX analysis using HPLC derived pigments identified five major phytoplankton functional groups (PFGs) in the CGE: diatoms, dinoflagellates, cryptophytes, green algae (chlorophytes), and cyanobacteria. Among these, diatoms, cyanobacteria, and chlorophytes were the predominant groups throughout the study period. Diatoms constantly dominated the phytoplankton community in the nearshore waters as well, as indicated by the predominance of fucoxanthin, except during the SIM, when the composition temporarily shifted. The dominance of diatoms in the CGE, despite periodic increases in cyanobacteria and cryptophytes, reflected variability in nutrient availability, particularly NO₃N and PO₄-P, driven by fluctuations in river discharge and tidal influence. Conversely, the nearshore waters exhibited relatively stable hydrographic conditions, which supported a persistent, albeit lower, diatom growth with minimal temporal variability in community structure.

2018-2019年，利用hplc衍生的生物标志物色素和CHEMTAX分析，在印度西南海岸的Chandragiri河口（CGE）和邻近的近岸水域（Kasaragod附近20 m）对浮游植物群落组成进行了全面调查。CGE具有高度动态的水文条件，这反映在其浮游植物群落的显著时空变异性上。在非季风期，特别是冬季季风（WM）和春季季风间期（SIM），河口水温为温暖（29°C），多盐-真盐混合（28-35），关键营养物质（铵、硝、磷酸盐）浓度相对较高，这些条件支持了CGE中较高浓度的叶绿素a (Chl a)，在冬季季风（WM）和春季季风间期（SIM）平均为2.14±0.65 mgm−3和1.78±0.45 mgm−3。相反，夏季风（SM）期的特征是较冷（26°C）的浑浊淡水涌入，这显著抑制了浮游植物生物量，导致整个河口的Chl a水平异常低（0.2 mg m - 3）。在邻近的近岸水域，Chl a浓度在所有季节都保持较低（<1 mg m−3）。使用HPLC衍生色素的CHEMTAX分析确定了CGE中五个主要的浮游植物官能团（PFGs）：硅藻、甲藻、隐藻、绿藻（绿藻）和蓝藻。其中，硅藻、蓝藻和绿藻是整个研究期间的优势类群。硅藻也一直在近岸水域的浮游植物群落中占据主导地位，这一点从岩藻黄质的优势可以看出，除了在模拟水体中，当组成暂时发生变化时。尽管蓝藻和隐藻在CGE中周期性增加，但硅藻在CGE中的优势反映了养分有效性的变化，特别是NO3N和PO4-P，这是由河流流量波动和潮汐影响驱动的。相反，近岸水域表现出相对稳定的水文条件，这支持了硅藻的持续生长，尽管生长速度较低，群落结构的时间变化很小。

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引用次数: 0

Goal orientation and effectiveness of water environment governance in China 中国水环境治理的目标取向与有效性

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.2025.100673

Juan Wang, Xilin Zhao

In order to accurately assess the multi-temporal implementation of the River Chief System (RCS) policy, this study uses the Two-Stage Difference-in-Differences (DID2S) method to evaluates the influence of RCS on the water quality of Taihu Basin with the monthly data of the water quality class from 2007 to 2017. Empirical results show that the reform has not significantly improved the water quality of Taihu Basin. However, it has significantly improved the average annual compliance rate of water quality. The study further discusses the reasons from two perspectives. First, most water quality categories in functional water areas are gradually converging toward the Grade III water quality objective established by local governments. Second, the water quality development in some Water Functional Zones has become increasingly unbalanced. Areas with relatively easy-to-control pollution are gradually meeting standards, but in other areas where improvement is challenging, water quality continues to worsen. The study reveals the ‘policy distortions’ in the implementation of the RCS and provides data support for the subsequent improvement of the system.

为了准确评估河长制（RCS）政策的多时段实施情况，本研究利用2007 - 2017年太湖流域水质等级月度数据，采用双阶段差中差法（DID2S）评价了RCS对水质的影响。实证结果表明，改革并未显著改善太湖流域水质。但显著提高了年平均水质达标率。本研究进一步从两个角度探讨了原因。首先，功能水区大部分水质类别逐渐向地方政府制定的三级水质目标趋同。二是部分水功能区水质发展日趋不平衡。污染相对容易控制的地区正在逐步达标，但在其他难以改善的地区，水质继续恶化。该研究揭示了RCS实施过程中的“政策扭曲”，为后续系统的改进提供了数据支持。

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引用次数: 0

Scaling up analysis of human impacts on hydrological connectivity in Mediterranean viticultural landscapes: From hillslope to a watershed perspective 地中海葡萄栽培景观中人类对水文连通性影响的放大分析：从山坡到流域视角

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.2025.100700

Laura Cambronero , Yang Yu , Jesús Rodrigo-Comino

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.

在土地管理和精准葡萄栽培（PV）中，地理信息系统（GIS）和遥感的集成使得对多尺度地貌过程和水文模式的详细研究成为可能。尽管具有潜力，但与病虫害防治、疾病检测和植被评估等应用相比，这种方法仍未得到充分利用。本研究通过提出多尺度河流地貌和水文分析来解决这一差距，以加强可持续土壤管理和葡萄园保护。利用开放获取的国家遥感数据（数字地表模型）和基于无人机的图像，对一个48平方公里的流域和一个1公里长的葡萄园种植园进行了分析。结果表明：流域呈狭长型，坡度陡，排水密度大，影响了泥沙的沉积和流向，直接影响了葡萄园的种植。流域以向北流动为主（26.2%），而葡萄园水平水流变化较大，主要向东（20%）和向西北（16.5%）流动，影响了道路和水流路径。连通性指数（IC）强调了葡萄园较高的水文连通性，85.4%被列为高IC，而更广泛的流域为18.1%。这些发现强调了将地貌过程纳入光伏和土地管理以避免误解的必要性。通过分析多尺度的水文连通性和沉积物运输，本研究加强了对塑造葡萄园景观过程的理解，并为未来的研究提供了基础，旨在将这些知识整合到土壤保持和可持续管理策略中。

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引用次数: 0

Connecting the dots: Spatial connectivity and ecological dynamics in a tropical river catchment 连接点：热带河流集水区的空间连通性和生态动态

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.2025.100698

Grite Nelson Mwaijengo

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 (>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.

河网独特的分支几何形态使其区别于其他生态系统，并强烈影响关键的生态过程。然而，明确解释树枝状结构和流动方向的模型仍未得到充分利用。利用40个监测点的数据，应用空间流网络模型（SSNM）研究了坦桑尼亚东北部Usa-Kikuletwa河流域水化学和底栖大型无脊椎动物的空间格局。ssnm结合了水流连接、水流不连接和欧几里得地点之间的水文距离，从而能够明确表示河流网络的依赖关系。在细尺度（≤2 km）和宽尺度（≤10 km）上，水化学和大型无脊椎动物指数均存在空间自相关性。ssms解释了高达31.7%的方差，优于欧几里得模型。大尺度尾向上（上游水流连接）模型强调了上游过程和水文连通性在水化学中的作用，而尾向下（下游导向）模型更好地解释了大型无脊椎动物的变化，表明了扩散、漂移和大尺度景观因素的影响。我们的研究结果证明了SSNMs在捕获树突空间依赖性和改进非洲热带河流系统预测方面的实用性。

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引用次数: 0