Through measuring slope forms on the spot , serried sampling , physical and chemical analyzing , and measuring soil erosion from natural and artificial rainfalls , the project researched in the approaches and behaviors of soil erosion affecting contents of soil carbon and nutrient , and the law of soil carbon and nutrient distributing in micro - topographty under influences of soil erosion . in the same time , supported by geographic information system , models of soil carbon and nutrient changing with soil erosion have been built , and spatial processes of soil erosion affecting soil carbon and nutrient have been simulated , and annual and long - term changing of soil carbon and nutrient under impact of soil erosion have been estimated and forecasted , and synchronously , a elementary assessment for different soil erosion management has b een performed by using the models built in the study 本研究以三峡库区秭归县水田坝乡王家桥小流域四个径流试验区二十个标准小区为研究对象，通过坡形实地测量、坡面密集采样的颗粒分析和养分含量分析以及人工模拟降雨实验，研究了土壤侵蚀对土壤碳和养分的影响途径和表现，侵蚀作用影响下土壤碳和养分在微地形空间的分布规律；同时，在地理信息系统的支持下，建立了侵蚀条件下的土壤碳和养分变化模型，模拟了侵蚀对土壤碳和养分影响的空间过程，预测了侵蚀影响下土壤碳和养分的年变化及多年变化，并通过研究建立的模型对不同侵蚀控制措施进行了初步的效益评价。
Knowledge and conclusions educed from the study are following : firstly , actual behaviors of soil erosion on affecting soil quality have been described . comparisons of landform measurements on the spots , and results of physical and chemical analyzing indicated that micro - iandform , proportions of soil particles sizes , and contents of soil carbon and nutrient have differences of spatial distribution under different conditions of fertilization development , cultivation , slope , and soil erosion management , which are closely related to intensities of soil erosion and sediment deposition 研究中，在前人基础上紧跟研究前沿，主要得出如下成果和创新点：一、明确了侵蚀作用影响土壤碳和养分含量的具体表现：经过实地测量、采样颗粒分析和养分分析，结果表明，在不同培肥、不同耕作、不同坡度以及不同侵蚀控制条件下，受侵蚀及堆积作用强弱的影响，微地形形态、土壤颗粒组成、碳和养分含量在空间上都可能出现较大的分布差异。
