四川紫色土区土壤养分径流和泥沙流失特征研究

对四川紫色土区土壤养分径流和泥沙流失特征进行了研究 ,结果表明 :土壤氮素主要随径流流失 ,主要土内径流和地下径流携带NO3 N所造成 ;土壤磷主要随泥沙流失 ,泥沙中的养分有明显的富集现象 ,但不同流域以及不同雨次的富集系数明显不同 ;同时泥沙N、P的富集系数与泥沙浓度有一定的关联 ,一般是泥沙浓度高 ,N富集系数低 ,P富集系数高

FEATURES OF SOIL NUTRIENT LOSS ACCOMPANIED WITH RUNOFF AND SEDIMENT FOR THE PURPLE SOIL DISTRIBUTED AREA IN SICHUAN PROVINCE

Environmental issues resulted from soil nutrient loss has caught increasingly concerns within international researchers. Since literature concerning China is very limited, it is meaningful to research the features of soil nutrient loss. The main effort of this paper is devoted to the features of soil nutrients loss accompanied with runoff and sediment for the purple soil distributed areas in Sichuan Province. The result shows that the main way of the soil nitrogen loss is the loss accompanied with the runoff, and mainly with subsurface of base flow. It also indicates that the main way of the soil-P loss is with sediment; and the nutrient content in sediment is of enrichment, but different enrichment ratio with different catchments and rainfall; With regards to the enrichment ratio of N and P, it is related to the sediment concentration.