滇东北山区坡耕地土壤侵蚀的作物经营因子

通过建立滇东北山区４种代表性作物种植类型———玉米、马铃薯、黄豆、玉米－黄豆间作对降雨引起土壤侵蚀的影响试验小区并进行连续３年实测，分析确定了作物经营因子（Ｃ）值，为建立坡耕地土壤流失方程、进行土壤侵蚀预测预报、制定水土保持农业措施奠定了基础依据

CROP_PLANTING FACTOR OF SOIL EROSION OF SLOPING CULTIVATED LAND IN THE NORTHEAST MOUNTAIN REGION OF YUNNAN PROVINCE

By means of setting up experimental spots of the influences of four representative crop_planting types maize,potato,soybean and maize_soybean intercrop on rainfall erosion,and measuring continuously three years in the northeast mountain region of Yunnan province,the C value of crop_planting factor was analysed and calculated.The results showed:1.the conserving effect of crops on the soil of slopeland increases with the growth of crops,i.e.the higher the covering rate of ground is,the lower the C value is.2.in four crop_planting types,the maximum conserving effect on the soil of slopeland is maize_soybean intercrop,its C value is 0 1990,the C values of other crops are respectively:maize 0 3517,soybean 0 3551,potato 0 3721.