农业环境科学学报2017，Vol.36Issue(4)：753-760,8.DOI:10.11654/jaes.2016-1428
金井流域景观格局对地下水硝态氮时空分布的影响
Landscape effects on temporal and spatial pattern of groundwater nitrate concentrations in the Jinjing catch-ment
摘要
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 concen-trations(NO-3-N)using the Moran's I index and spatial lag regression analysis. The results suggested that:groundwater NO-3-N pollution oc-curred 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 NO-3-N concentrations showed obvious spatial auto-correlation mainly due to the NO-3-N transport through groundwater flow, and the Moran's global indices were greater in sum-mer and autumn(0.254∽0.277)than in spring and winter(0.152∽0.170)at the catchment scale;groundwater NO-3-N concentrations signifi-cantly 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 agri-cultural catchments.关键词
氮素/土地利用方式/面源污染/流域环境/生态水文过程Key words
nitrogen/land use type/non-point source pollution/catchment environment/eco-hydrological process分类
资源环境引用本文复制引用
刘白杨,尹黎明,刘新亮,李巧云,王毅,李勇,吴金水..金井流域景观格局对地下水硝态氮时空分布的影响[J].农业环境科学学报,2017,36(4):753-760,8.基金项目
国家科技支撑计划项目(2014BAD14B01,2014BAD14B05) （2014BAD14B01,2014BAD14B05）
湖南省科协决策咨询研究计划课题 The National Key Technology Research and Development Program of the Ministry of Science and Technology of China(2014BAD14B01, 2014BAD14B05) （2014BAD14B01, 2014BAD14B05）
The Decision and Consulting Research Project of the Hunan Provincial Association for Science and Technology （）
