RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2019, Vol. 28 >> Issue (01): 175-183.doi: 10.11870/cjlyzyyhj201901018

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Effects of Land Use Structure on Nitrogen Export in Chishui River Watershed of Southwest China

QIN Li1，FU Yu-wen2，WU Qi-xin1，3，AN Yan-ling4，LIU Rui-lu2，LV Jie-mei3，WU Zhen-yu5    

  1. （1.Key Laboratory of Karst Eenvironment and Geohazard,Ministry of land and Resources, Guizhou University ,Guiyang 550025,China; 
    2.Guizhou Soil and Water Conservation Monitoring Station, Guiyang 550001,China; 
    3.College of Resources and Environmental Engineering ,Guizhou University ,Guiyang 550025,China;
    4.Guizhou Institute of Technology,Guiyang 550003, China;
    5.Xinkai Water Environment Investment Company,Beijing 100085,China）

  • Online:2019-01-20 Published:2019-02-20

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Abstract: Land use is a key factor in non-point source pollution. This study uses the landsat8 OLI satellite image as the base map, combined with the field investigation of the interpretation area to obtain the land use map of the Chishui River Basin, and adopts the hydrology and spatial analysis module of ArcGIS to extract 22 sub-basins, then analyzes the output characteristics of different forms of nitrogen TN, NO3--N and NH4+-Nduring abundant and dry season in different sub-basins and their relationship with land use structure. The analysis results of each sub-basin show that the basin land use structure has a greater impact on nitrogen output than the basin area. During the abundant season, the greater the proportion of cultivated land and shrub in the basin, the greater the nitrogen output intensity; as the proportion of forest land increases, the nitrogen output decreases.

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