Watershed Ecology and the Environment最新文献

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Satellite-based alpine water dynamics response to climate change across the Tibetan Plateau 基于卫星的青藏高原高寒水动态对气候变化的响应

Watershed Ecology and the Environment

Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.05.007

Yuling Liang , Hui Zhao , Meihong Wang , Xiaodan Wang

The spatiotemporal water dynamics across the Tibetan Plateau (TP) are important for sustainable utilization and management of water resources in Asia, particularly under the influence of climate change. However, comprehensive assessments of the long-term variations in lakes, marshlands, and terrestrial water storage (TWS) across the TP remain limited. This study utilized a long-term series of Landsat images of the TP to create annual lake maps with 30-m spatial resolution for the period 1990–2022, using a surface water frequency algorithm and Google Earth Engine (GEE). Based on the derived maps, the spatiotemporal trends of marshland area (MA) were analyzed. We also investigated changes in TWS from 2002 to 2022 using GRACE and GRACE-FO data products. Furthermore, we conducted a quantitative analysis of the drivers of changes in lake area (LA) and TWS. Results show that from 1990 to the 2020s, both LA and the number of lakes increased rapidly, with the most pronounced changes occurring in the Inner Plateau. In contrast, MA exhibited a declining trend during 1990–2020, also predominantly in the Inner Plateau. TWS exhibited an overall increasing trend, predominantly occurring in the Inner Plateau, where lakes are most densely distributed—mirroring the spatial pattern of lake expansion. The findings of this study could assist both the government and the general public in confronting the escalating challenges regarding water resources and water security in China.

青藏高原时空水动态对亚洲水资源的可持续利用和管理具有重要意义，特别是在气候变化的影响下。然而，对整个青藏高原湖泊、沼泽地和陆地储水量（TWS）长期变化的综合评估仍然有限。本研究利用青藏高原的一系列长期Landsat图像，利用地表水频率算法和谷歌地球引擎（GEE），创建了1990-2022年期间30米空间分辨率的年度湖泊地图。在此基础上，分析了湿地面积的时空变化趋势。我们还使用GRACE和GRACE- fo数据产品调查了2002年至2022年TWS的变化。此外，我们还对湖泊面积（LA）和TWS变化的驱动因素进行了定量分析。结果表明：1990 ~ 21世纪20年代，湖泊数量和LA均呈快速增长趋势，其中以内高原变化最为明显；1990—2020年，MA呈下降趋势，且主要集中在高原腹地。TWS总体呈增加趋势，主要发生在湖泊分布最密集的内高原地区，反映了湖泊扩张的空间格局。本研究的结果可以帮助政府和公众应对中国水资源和水安全方面日益严峻的挑战。

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引用次数: 0

Spatial distribution of soil organic carbon and nutrients in the southern Sundarbans of Bangladesh 孟加拉国孙德尔本斯南部土壤有机碳和养分的空间分布

Watershed Ecology and the Environment

Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.03.005

Abu Bakar Siddique , Muhaiminul Islam , Nishat Tasnim , Abdullah Al Maruf , Abu Sayed Al Helal , Masum Howlader

The Sundarbans, the world’s largest mangrove forest plays a crucial role in carbon sequestration and coastal ecosystem stability. This study investigated the spatial distribution of surface soil nutrients, organic carbon (%OC), salinity, and pH, along with their interrelationships, at a regional scale in the southern part of the Sundarbans. In this study, a total of 21 soil samples were taken from 10 cm depth at 21 locations in the southern part of the Sundarbans areas. The surface soil samples were analyzed in the laboratory to determine essential soil properties, including organic carbon (%OC), nitrogen (%N), phosphorous (P), potassium (K), magnesium (Mg), calcium (Ca), sulfur (S), pH, electric conductivity (EC), and salinity. The results showed spatial variations of nutrient concentrations, with higher surface soil organic carbon (%OC) and nutrient levels observed in areas with lower salinity and pH. Pearson’s correlation matrix (PCM) analysis revealed a significant negative correlation between surface OC and both salinity and pH (p < 0.05). Moreover, the soils were predominantly silt-textured, with nutrient levels ranging from normal to brackish-saline, largely influenced by salinity intrusion. Cluster analysis (CA) and principal component analysis (PCA) revealed distinct patterns in surface soil physicochemical properties, suggesting that salinity, pH, and organic carbon are main factors influencing nutrient distribution in the study area. The study emphasizes the need to conserve the Sundarbans by reducing anthropogenic activities, regulating freshwater inflows to control salinity, and promoting mangrove regeneration to maintain soil health and ecological balance.

孙德尔本斯是世界上最大的红树林，在碳封存和沿海生态系统稳定方面发挥着至关重要的作用。研究了孙德尔本斯南区表层土壤养分、有机碳（%OC）、盐度和pH的空间分布特征及其相互关系。本研究在孙德尔本斯地区南部的21个地点采集了21个10 cm深度的土壤样本。在实验室对表层土壤样品进行分析，以确定土壤的基本性质，包括有机碳（%OC）、氮（%N）、磷(P)、钾(K)、镁（Mg）、钙（Ca）、硫(S)、pH、电导率（EC）和盐度。结果显示养分浓度存在空间差异，在盐度和pH较低的地区，表层土壤有机碳（%OC）和养分水平较高。Pearson 's相关矩阵（PCM）分析显示，表层土壤有机碳（%OC）与盐度和pH均呈显著负相关(p <；0.05)。此外，土壤以粉砂质为主，营养水平从正常到微咸不等，主要受盐度入侵的影响。聚类分析（CA）和主成分分析（PCA）揭示了表层土壤理化性质的明显变化规律，表明盐度、pH和有机碳是影响研究区土壤养分分布的主要因素。该研究强调需要通过减少人为活动、调节淡水流入以控制盐度、促进红树林再生以保持土壤健康和生态平衡来保护孙德尔本斯。

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Hydrological challenges and agricultural opportunities in Northern Ghana: addressing climate change impacts and future pathways 加纳北部的水文挑战和农业机遇：应对气候变化影响和未来途径

Watershed Ecology and the Environment

Pub Date : 2025-01-01 DOI: 10.1016/j.wsee.2025.08.001

Prosper Kpiebaya , Abdul-Ganiyu Shaibu , Eliasu Salifu , Mabel Kumah , Mohammed Alhassan Issah , Rophina Muotieme Tingan

The management of water resources in agriculture is of paramount importance, especially in regions facing hydrological challenges exacerbated by climate change variability. This study explores the hydrological challenges, opportunities, and the way forward for agriculture in the Northern part of Ghana. The region faces issues such as water scarcity, erratic rainfall patterns, land degradation, floods, and droughts, which significantly impact agricultural productivity and livelihoods. This study identifies the region’s critical water management gaps and highlights both barriers and opportunities for sustainable agricultural growth. Our analysis emphasizes that climate-smart water technologies, such as drip irrigation, rainwater harvesting, and hydrological modeling, can significantly enhance water-use efficiency and resilience. Coupled with participatory water governance, infrastructure upgrades, and sustainable land management, these approaches can mitigate water scarcity, soil erosion, and climate risks. Through a comprehensive review of literature and analysis of hydrological data, this study provides insights into the complex interactions between climate change, water resources, and agriculture in Northern Ghana. By understanding these dynamics and implementing appropriate adaptation strategies, stakeholders can work towards building a more resilient agricultural sector capable of addressing the challenges posed by climate change variability.

农业水资源管理至关重要，特别是在面临因气候变化多变性而加剧的水文挑战的地区。本研究探讨了加纳北部农业面临的水文挑战、机遇和未来发展方向。该地区面临着水资源短缺、降雨模式不稳定、土地退化、洪水和干旱等问题，这些问题严重影响了农业生产力和生计。本研究确定了该地区在水管理方面的重大差距，并强调了可持续农业增长的障碍和机遇。我们的分析强调，气候智能型水资源技术，如滴灌、雨水收集和水文建模，可以显著提高水资源利用效率和复原力。这些方法与参与式水治理、基础设施升级和可持续土地管理相结合，可以缓解水资源短缺、土壤侵蚀和气候风险。通过对文献的全面回顾和对水文数据的分析，本研究深入了解了加纳北部气候变化、水资源和农业之间复杂的相互作用。通过了解这些动态并实施适当的适应战略，利益相关者可以努力建设一个更具抵御力的农业部门，能够应对气候变化多变性带来的挑战。

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