Comprehensive effects of climate, land use/cover and management practices on runoff and nutrient variations in a rapidly urbanizing watershed,Chemosphere

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Comprehensive effects of climate, land use/cover and management practices on runoff and nutrient variations in a rapidly urbanizing watershed
Chemosphere ( IF 8.1 ) Pub Date : 2023-12-11 , DOI: 10.1016/j.chemosphere.2023.140934
Jiang Wu ₁ , Cheng-Xin Qin ₂ , Yao Yue ₃ , Shu-Peng Cheng ₄ , Hui Zeng ₁ , Ling-Yan He ₁

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As non-point source pollution has emerged as a significant global and regional concern, climate change (CC), land use/cover transformation (LUCT), and management practices (MP) play vital roles in addressing nutrient pollution. However, current studies lack comprehensive quantification and consistent conclusions on the response to these factors, especially for management practices. To quantify and elucidate the impact of representative environmental factors on rapidly urbanizing regions, this study focused on the Shenzhen River, which serves as the most typical urbanizing watershed. Using a process-based distributed hydrological model with a factor-controlled simulation method, we identified significant differences in nutrient concentrations and the impacts of climate variability, land use/cover changes, and anthropogenic interventions from 2003 to 2020. Moreover, effective measures greatly improved water quality in the Shenzhen River during study period, as evident from trend and cluster analysis. However, ecological water supplements implemented since 2016 have led to a slight reduction in simulated runoff performance, and CC may amplify the synergistic effects of precipitation and temperature on the river system. While the implemented practices have been effective in reducing total nitrogen (TN) and total phosphorus (TP) loads, strong TN pollution control is still needed in rapidly urbanizing areas due to the results of land use/cover type changes. Our findings emphasize the intricate interplay among CC, LUCT, and MP in shaping water quality and hydrological processes in rapidly urbanizing watersheds, and clarify the independent effects of these factors on nutrients. This study contributes to a better understanding of the complex interactions between multiple factors in watersheds and provides guidance for sustainable watershed management.

中文翻译：

气候、土地利用/覆盖和管理实践对快速城市化流域径流和养分变化的综合影响

随着非点源污染已成为全球和区域的重大问题，气候变化（CC）、土地利用/覆盖转变（LUCT）和管理实践（MP）在解决养分污染方面发挥着至关重要的作用。然而，目前的研究缺乏对这些因素的反应的全面量化和一致的结论，特别是对于管理实践。为了量化和阐明代表性环境因素对快速城市化地区的影响，本研究以深圳河作为最典型的城市化流域为研究对象。利用基于过程的分布式水文模型和因子控制模拟方法，我们发现了2003年至2020年养分浓度的显着差异以及气候变化、土地利用/覆盖变化和人为干预的影响。此外，有效的措施大大改善了从趋势和聚类分析可以看出，研究期间深圳河的水质状况。然而，2016年以来实施的生态补水导致模拟径流性能略有下降，CC可能会放大降水和气温对河流系统的协同效应。虽然所实施的做法有效地减少了总氮（TN）和总磷（TP）负荷，但由于土地利用/覆盖类型变化的结果，在快速城市化地区仍然需要强有力的TN污染控制。我们的研究结果强调了 CC、LUCT 和 MP 在塑造快速城市化流域的水质和水文过程中复杂的相互作用，并阐明了这些因素对营养物的独立影响。这项研究有助于更好地理解流域中多个因素之间复杂的相互作用，并为可持续流域管理提供指导。

更新日期：2023-12-11

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