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| Landscape effects on temporal and spatial pattern of groundwater nitrate concentrations in the Jinjing catchment |
| Received:November 10, 2016 |
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| KeyWord:nitrogen;land use type;non-point source pollution;catchment environment;eco-hydrological process |
| Author Name | Affiliation | E-mail | | LIU Bai-yang | College of Biological Science & Technology, Hunan Agricultural University, Changsha 410125, China
Changsha Research Station for Agricultural & Environmental Monitoring and Key Laboratory of Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | YIN Li-ming | Hunan Water Resources and Hydropower Research Institute, Changsha 410011, China | | | LIU Xin-liang | Changsha Research Station for Agricultural & Environmental Monitoring and Key Laboratory of Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | 814708901@qq.com | | LI Qiao-yun | College of Biological Science & Technology, Hunan Agricultural University, Changsha 410125, China | 1065596897@qq.com | | WANG Yi | Changsha Research Station for Agricultural & Environmental Monitoring and Key Laboratory of Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | LI Yong | Changsha Research Station for Agricultural & Environmental Monitoring and Key Laboratory of Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | WU Jin-shui | Changsha Research Station for Agricultural & Environmental Monitoring and Key Laboratory of Agro-ecological Processes in Subtropical Regions, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | |
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| Abstract: |
| Groundwater samples were randomly collected from 120 wells in the selected Jinjing River catchment, Changsha County, Hunan Province, in the spring, summer, autumn, and winter of 2013-2014, to determine landscape pattern effects on groundwater nitrate concentrations(NO3--N) using the Moran's I index and spatial lag regression analysis. The results suggested that:groundwater NO3--N pollution occurred in the catchment, with 4.9%~17.5% samples exceeding the WHO drinking water standards(>10 mg N·L-1), and particularly higher pollution frequencies in summer and winter than those in spring and autumn seasons; groundwater NO3--N concentrations showed obvious spatial auto-correlation mainly due to the NO3--N transport through groundwater flow, and the Moran's global indices were greater in summer and autumn(0.254~0.277) than in spring and winter(0.152~0.170) at the catchment scale; groundwater NO3--N concentrations significantly related to the areal proportion of agriculture, forest, and residential area when fitted by the spatial lag regression model(P<0.05), and their determine coefficients of fitting strongly varied with seasons and the radius from the wells. Therefore, the results could provide technical basis for reasonable landscape planning to protect the groundwater environment and drinking water safety in subtropical hilly agricultural catchments. |
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