摘要
利用石匣水土保持监测试验区 ,分析降雨径流及土壤中氮、磷流失的规律 .研究结果表明 :(1)开荒及裸地最易产生径流 ,其中荒坡产生的泥沙中总氮含量、总磷含量最高 ,其次为林果地、草地 ,农地最低 ;(2 )流失泥沙中氮、磷富集 ,磷主要以泥沙形式被迁移带走 ,溶解态极少 ;泥沙中总氮、总磷富集率为坡耕 >免耕 >等高种植 ;(3)大部分雨后土壤的pH值、有机质略有下降 .雨后土壤主要是 0 0 0 5～ 0 0 0 1mm及 <0 0 0 1mm粒径减少 ,它们可能是氮、磷流失的载体 ;主要为细颗粒 ;(4)等高种植及植物带对控制径流污染 ,效果极为明显 ;其次为免耕 ,应杜绝坡耕 .由于氮、磷流失多以细颗粒为载体 ,应侧重减少细颗粒的流失 .
Loss of nutrient in soil and runoff of Shixia Experimental Area in the watershed of Miyun reservoir are studied in this paper.The results show as follow:(1)Cultivating on virgin soil and bare field tend to generate runoff and erosion.The content of TN and TP in sediment of bare field are highest,then is wood land and grassland,the agricultural land is lowest;(2)nutrient is enriched in sediment.Phosphorus in migrated with sediment,while the dissoluble form in runoff is very little.The sequence of ratio of TN and TP is cultivating on slope field>No tillage>contour tillage;(3)PH and organic matter of eroded soil is low.Grains in size of 0 005～0 001 mm and <0 001 mm in eroded soil are fewer.(4)Vegetative filter strip is an effective way to control diffuse pollution.Being main carrier of loss nutrients,the fine particles are thought to be the controlling focus.
出处
《首都师范大学学报（自然科学版）》
2001年第2期79-85,共7页
Journal of Capital Normal University：Natural Science Edition
基金
北京市教委科技发展计划项目
北京市科技新星计划资助项目
