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以小流域为单元进行土壤侵蚀空间变化的定量动态研究，是探索土壤侵蚀规律和评价流域治理效益的一个重要途径和内容．以陕北黄土丘陵区安塞县纸坊沟流域内的两个小流域为研究实例，在分析野外小区观测资料建立土壤侵蚀模型的基础上，应用由ＡＲＣ／ＩＮＦＯ地理信息软件系统支持建立的空间信息数据库系统和土壤侵蚀模型相结合的方法，进行了小流域次降雨土壤侵蚀空间变化的定量计算．进而研究了流域内侵蚀强度的空间变化规律及其与地貌和土地利用的关系。实测资料检验结果表明，研究建立的预报方法，具有较高的计算精度。
Quantitative dynamic study on the spatial variation of soil erosion based on the small watershed is an important approach and content to explore the law of soil erosion and evaluate the benefits of watershed management. Taking the two small watersheds in the Zhifanggou valley of Ansai County in the loess hilly region of northern Shaanxi as an example, based on the analysis of the data from the observation data of the outdoor communities and the establishment of the soil erosion model, the space established by the ARC / INFO geographic information software system was established Information database system and soil erosion model were combined to quantify the spatial variation of soil erosion in sub-rainfall of small watershed. Then the spatial variation of erosion intensity and its relationship with landform and land use are studied. The test results of the measured data show that the forecasting method established by the research has high computational accuracy.