三江平原水土流失变化趋势浅析

影响水土流失的因素不外乎自然和人为两个方面：自然因素有气候、土壤、植被、地形4个因子；人为影响则主要指土地利用方式、水土保持措施等。本文利用美国USLE模型，该方程全面考虑了影响水土流失的自然因素，使用降雨侵蚀力、土壤可蚀性、坡度坡长、作物覆盖和水土保持措施五大因子进行定量计算，分析三江平原近五十年来水土流失现状及水土流失变化趋势，并提出措施建议。

Variasion Trend of Water and Soil Loss on Sanjiang Plain

The factors affecting water and soil loss are ascribed to two aspects,four natural factors such as weather,soil,vegetation and landform and man-made ones,for example,manner of the ground utilized,and so on.In this paper,natural factors affecting water and soil loss were explored in detail by means of quantitive calculations using American USLE model and five ingredients,namely rainfall eroding,soil corroding,gradient and slop length,crop covering and measures of water and soil conservation.On the base of th...