摘要
坡面径流和侵蚀泥沙是磷素进入洋河水库的主要非点污染源。根据洋河流域多年的降雨特点,通过对天然降雨资料分析和人工模拟降雨,对该流域缓坡地表径流中磷素输出进行了初步的研究,结果表明:洋河流域缓坡地土壤磷素流失以颗粒态磷为主,不同土地利用方式下洋河流域缓坡地地表径流中不同形态磷含量的大小顺序为:小麦-玉米连作地>高产玉米地>低产玉米地>次生灌木林地;随着降雨强度的增加,径流中颗粒态磷的含量逐渐增加,但Ortho-P的含量却下降;不同植被覆盖度下坡面地表径流中颗粒态磷和TP的含量,随着植被覆盖度增大而减少,但径流中Ortho-P的含量则随着覆盖度的增加而增加。
Runoff and soil losses from agricultural fields were investigated as the major non-point sources of phosphorus entering Yanghe reservoir. According to rainfall characteristics of Yanghe watershed in recent years, the phosphorus export by surface runoff from gentle slope was studied under simulated rainfall and analyzed rainfall data conditions. The results showed that the soil phosphorus losses of Yanghe watershed relied mainly on particulate phorphours; the content of different forms phosphorus of surface rainfall in Yanghe watershed was wheatcorn continuous cropping〉high-yield cron cropping〉low-yield corn cropping〉secondary shrubs with the increase of rainfall intensity, the content of particulate phosphorus increased slowly but that of ortho-P decreased; with the plant cover degree increasing, the content of particulate phosphorus and TP of surface runoff decreased slowly but that of ortho-P increased slowly.
出处
《水土保持学报》
CSCD
北大核心
2006年第3期10-12,16,共4页
Journal of Soil and Water Conservation
基金
河北省教育厅自然科学计划项目(Z2005112)
中国环境管理干部学院基金项目(2005-002)
关键词
磷素
坡面地表径流
洋河流域
phosphorus
surface runoff
Yanghe watershed
