GIS和遥感支持下的小流域非点源污染负荷估算

Evaluation of Pollution from Non-point Sources in Weigou Small Watershed Based on GIS and RS

基于QuickBird遥感影像和GIS技术,以黄土丘陵沟壑区典型小流域———魏沟小流域为研究区,采用通用土壤流失方程和固态污染物负荷方程,进行小流域农业非点源污染负荷的估算与分析。结果表明:魏沟小流域年平均侵蚀模数为7501.88 t/km2,侵蚀级别属强度,年水土流失量2.6×104t;土壤N、P、K养分流失年负荷量分别为18737kg、17454kg和4133kg。

Soil nutrients loss was the main way of nonpoint source pollution. Based on the software of GIS and quick bird remote sensing image, amount of nutrients loss in the small watershed of Weigou was evaluated by using RUSLE and solid pollutant load equation. Results showed that the the amount of soil loss was 2.6×10^4t/a, and annual average soil erosion amount was 75.02 t/hm^2, which belonged to intensive degree erosion; the fixed pollutant loads of N,P and K were respectively18737 kg/a, 17454 kg/a and 4133 kg/a.