摘要
为了解横垄耕作的面源污染截留效应,选取吉林省长春市莫家沟小流域横垄耕作坡耕地为研究区,应用210Pbex核素示踪技术得到研究区土壤侵蚀模数为2 268 t/(km2.a),吸附态氮、磷流失负荷分别为4 889、2 022 kg/a;运用RU-SLE2.0模型,模拟在同等立地条件下顺坡耕作土壤侵蚀模数约为6 200 t/(km2.a)。对比结果表明:横垄耕作较顺坡耕作可减少约63%的土壤流失量及随土壤流失的吸附态氮磷负荷。
In order to understand the interception effects of non-point source pollution of contour farming,the paper selected Mojiagou Small Watershed in Changchun City of Jilin Province as a studied area and obtained the soil erosion modulus as 2 268 t/(km2·a) and the loss load of adsorbed nitrogen and phosphorus as 4 889 kg/a and 2 022 kg/a respectively of the area by using 210Pbex nuclide tracing technique.The soil erosion modulus of downslope tillage simulated with the same site factors was 6 200 t/(km2·a) by using RUSLE 2.0 model.The outcomes show that comparing with downslope tillage,the soil loss and the loss load of adsorbed nitrogen and phosphorus of contour farming can be reduced by 63%.
出处
《中国水土保持》
2012年第9期46-47,77,共2页
Soil and Water Conservation in China
基金
国家"十二五"科技支撑计划课题(2012BAC19B03)
华北水利水电学院高层次人才科研启动项目(001289)
关键词
核素示踪技术
RUSLE2
0模型
吸附态氮磷
横垄耕作
顺坡耕作
面源污染
东北地区
nuclide tracing technique
RUSLE 2.0 model
adsorbed nitrogen/phosphorus
contour farming
downslope tillage
non-point source pollution
northeast China
