摘要
在室内人工模拟降雨条件下,选择沛沿河流域最具代表性的3种土地利用类型,研究暴雨过程中农田地表径流氮的流失规律。结果表明,在暴雨条件下,3种土地利用类型的地表径流量大小顺序为水稻田>林地>果地;地表径流氮流失量随土地利用类型表现出明显差异,暴雨条件下3种土地利用类型的地表径流水相TN流失量大小顺序为果地>林地>水稻田,地表径流水相颗粒态氮(PN)占水相TN的比例在67%以上,地表径流沉积物相TN流失量大小顺序为林地>水稻田>果地,地表径流氮流失均以水相为主;3种土地利用类型的累积地表径流量与累积氮流失量的相关系数都在0.99以上。
The loss of nitrogen species from soils of three typical land use patterns of Pei Yan river watershed under the simulated rainfall was studied in the lab.Concentration profiles of the nitrogen species in storm runoff were monitored.Under the same rainfall conditions,the runoff flow was greatest in the paddy field,followed by the forest land and the orchard;shortly after the rainfall,the surface runoff samples of the orchard had the highest total nitrogen concentrations and those of the paddy field had the lowest.The lost nitrogen was mostly particulate nitrogen(>67% of the total) and that more nitrogen was found in runoff than that in the sediments of runoff.The cumulative total nitrogen loss and runoff flow was well correlated by a simple power equation with a correlation coefficient of >0.99.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2010年第12期18-21,共4页
Environmental Pollution & Control
基金
国家大学生创新性试验计划项目(No.091029025)
徐州市科技局项目(No.XM08C029
No.XJ09081)
关键词
沛沿河流域
人工降雨
土地利用
氮流失
地表径流
Pei Yan River watershed
simulated rainfall
land use
nitrogen loss
surface runoff
