土壤流失方程在山区耕地可持续利用适宜性评价与土地利用规划中的应用

应用已建立的土壤流失方程进行了滇东北山区基于可持续利用的耕地适宜性评价，以土壤抗蚀年限为主要指标，将山区耕地适宜性和可持续性程度分为高度适宜（高度持续）、中度适宜（中度持续）、低度适宜（低度持续）、有条件适宜（有条件持续）、不适宜（不可持续）５个等级。研究结果表明，土壤流失方程在山区耕地适宜性与可持续性评价以及土地利用规划工作中具有较大的应用价值。

THE APPLICATION OF SOIL LOSS EQUATION IN CULTIVATED LAND SUITABILITYEVALUATION BASED ON SUSTAINABLE USE AND LAND USE PLANNING IN THE NORTHEASTMOUNTAIN REGION OF YUNNAN PROVINCE

The author in this paper try to apply soil loss equation developed in the northeast mountain region of Yunnan province to the evaluation of cultivated land suitability based on sustainable use. The way of this study expounds as follows:first of all,using soil loss equation, the author calculated the annual average soil loss amount of unit area of every sloping cultivated land unit.Subsequently,on the basis of analysing the indexes of soil loss tolerance and available soil horizon thickness,the author calculated the erosion_resistant age of soil of every unit.Using this value as leading index,and considering three supplementary indexes (i.e.annual grain yield of unit area,temperature condition,and water resources condition),cultivated land suitability and sustainability degree in mountain region was divided into five grades:highly suitable (highly sustainable),middlingly suitable (middlingly sustainable),lowly suitable (lowly sustainable),conditionally suitable (conditionally sustainable),insuitable (insustainable). The study shows that soil loss equation is of great value in application to the cultivated land suitability and sustainability evaluation as well as land use planning in mountain region,it is a useful technical tool for mapping out the rational use planning and countermeasures of mountain land.