密云水库上游地区不同土地利用方式面源污染试验

为了更合理地利用土地、减少面源污染,利用密云水库上游石匣坡地径流场不同土地利用试验小区的5年观测数据,分析不同土地利用方式对面源污染的影响。研究表明:不同土地利用方式多年平均次径流系数差异明显,依次为清耕休闲地>坡耕地玉米>荒草坡>鱼鳞坑刺槐>水平条山楂,多年平均土壤侵蚀量与径流中TP、TN和CODMn流失量随径流系数的增大而增加,流失量与径流系数呈显著的正相关关系;径流中养分含量与径流系数之间没有显著相关关系。因此,通过增加植被覆盖或改变土地利用方式可大大减轻水土流失及其造成的面源污染。

Tests on non-point pollution of different land uses in upper watershed of Miyun Reservoir

For rational land use and reducing non-point pollution, the effects of different land uses on non-point pollution were analyzed based on observations at different land use plots in Miyun Shixia monitoring site. The results are as follows ： The average runoff coefficient was significantly different among the different land uses, in sequence of the stands plots＇ 〉 the hillside cultivated＇ s 〉 uneven ground＇ s 〉 the fish scale pit＇ s 〉 the horizontal bar＇ s. The mean annual soil loss and the losses of TP, TN, and CODMn in the funoff increased with the runoff coefficient increase, the loss amount had the significant positive correlation with the runoff coefficient. So, increasing vegetation coverage and changing land use types could be effective methods to reduce the soil loss and water loss, and non-point pollution.