Process of nutrient loss of red-soil slope land under comprehensive soil and water conservation measures

In order to study the law of soil nutrients loss in red-soil slop land, the field experiments under three ecological measures and three typical rainfalls were performed to investigate the N and P transfer process in Soil Conservation Ecological Science & Technology Demonstration Park in Jiangxi Province from 2006 to 2007. The results show that comprehensive measures of soil and water conservation can obviously control the concentration of total nitrogen and total phosphorus during the whole runoff process under different types of natural rainfall, and the losses of nitrogen and phosphorus during such process are mainly in the initial stage, and homogeneously stable in the later stage. The nutrition loss is mainly in the type of carrying nutrition in eroded sediment. In such a kind of nutrition loss process, the loss rate of nutrition in runoff to amount of total loss will decrease as the rain lowers. There are nutrition enrichments in eroded sediment of each treatment, and the value will increase when the rain becomes lower.