抚仙湖流域水土流失与入湖污染负荷量调查研究

摘要

对抚仙湖流域水土流失进行调查,对流失泥沙的营养元素进行测试,结果流域内水土流失面积146.01 km2,土壤侵蚀量54.7 ×104 t/a,入湖泥沙量21.2×104 t/a.随泥沙携带入湖中的各种营养元素:有机质4 793 t/a、全氮256.1 t/a、有效氮24 t/a、全磷352.5 t/a 、有效磷10.69 t/a、全钾4 442 t/a、有效钾49.41 t/a.长期年复输入加重了湖泊的淤积及入湖污染负荷量.%This article did an inquiry into the soiI erosion of guxian Lake basin and an investigation on the nutririve elements along with the loat sand.The results showed that the erosion area was 146.01 km2, soil erosion amoullt was 54.7 × 104t/a,and sand into lake amounl was 21.2×104 t/a.The amounts of niltrients drained into lake along with sand were respectively:organic matter 4 793 t/a,total nitrogen 256.1 Va,effective nitrogen 24 t/a,total phosphorus 352.5 t/a,available phosphorus 10.69 t/a,total potassium 4442 t/a,available potassium 49.41 t/a.For a long time of period,the continuous intake has aggravated the deposit and the capacity of pollution Ioad into Fuxian Lake.