洋河流域缓坡地土壤磷素径流输出特征  

The Characteristics of Soil Phosphorus Export by Surface Runoff from Gentle Slope in the Yanghe Watershed

作　　者：崔力拓[1] 李志伟[2] 

机构地区：[1]中国环境管理干部学院,河北秦皇岛066004 [2]河北农业大学水产学院,河北秦皇岛066003

出　　处：《土壤通报》2006年第6期1199-1202,共4页Chinese Journal of Soil Science

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)

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O rtho-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O rtho-P的含量则随着覆盖度的增加而增加。Runoff and soil losses from agricultural fields were considered as the major non -point sources of phosphorus entering the Yanghe Reservoir. According to the rainfall characteristics of the Yanghe watershed in recent years, the phosphorus export by surface runoff from gentle slopes was studied under the simulated rainfall events and analysis of rainfall data conditions. The results showed that the soil phosphorus losses from the Yanghe watershed relied mainly on particulate phosphorus;The content of different forms of phosphorus in surface rainfall in the Yanghe watershed was in the oxxler： wheat - corn continuous cropping 〉 high - yield corn cropping 〉 low - yield corn cropping 〉 secondary shrub ; With the increase of rainfall intensity , the content of particulate phosphorus increased slowly but that of Ortho - P decreased. In addition, with the plant cover degree increasing, the content of particulate phorphorus and TP in surface runoff decreased slowly but that of Ortho - P increased slowly.

关 键 词：磷素 坡面地表径沉 祥河沉域 

分 类 号：S157[农业科学—土壤学]