Spatiotemporal variation of nitrogen and phosphorus and its main influencing factors in Huangshui River basin

作者：Biqiong Dong, Tianling Qin, Yu Wang, Yan Zhao, Shanshan Liu, Jianming Feng, Chenhao Li, Xin Zhang · 发表于：Environmental Monitoring and Assessment · 年份：2021 · DOI：10.1007/s10661-021-09067-1 · 被引用次数：32 · 研究领域：Soil and Water Nutrient Dynamics、Hydrology and Watershed Management Studies、Water Quality and Pollution Assessment

Abstract The foundation of managing excess nutrients in river is the identification of key physical processes and the control of decisive influencing factors. The existing studies seldom consider the influence of rainfall-runoff relationship and only focus on a few anthropogenic activities and natural attributes factors. To address this issue, a comprehensive set of influencing factors including rainfall-runoff relationship (represented by runoff coefficient), basic physical and chemical parameters of water quality, land use types, landscape patterns, topography, and socioeconomic development was constructed in this study. M–K test and cluster analysis were conducted to identify the temporal mutation and spatial clustering characteristics of NH 3 -N and TP in Huangshui River basin, respectively. Partial least squares regression was used to elucidate the linkages between water contaminants and the factors. As shown in the results, the temporal mutations of NH 3 -N and TP were obvious in the middle reaches, with 4 out of 7 catchments in the middle reaches have a larger number of mutations of NH 3 -N than other catchments. The cluster analysis results of NH 3 -N and TP among catchments were similar. This study also indicated that although the Huangshui River basin was located in the upper reaches of the Yellow River, the influences of rainfall-runoff relationship on spatiotemporal changes of NH 3 -N and TP in its sub-basins were limited. Only the temporal change of NH 3 -N in Ji...