1997～ 1999年 3年时间 ,在田间生产条件下 ,研究贵州岩溶山区旱坡耕地梯化的环境效应 ,结果表明 :可防治水土流失和石漠化扩展 ;为大于 2 5度的旱坡耕地退耕还林 ,准备了较好的立地条件 ;提高小于 2 5度旱坡耕地的粮食作物产量近 2 0 % ,为陡坡耕地顺利退耕提供物质保障 ;本旱坡耕地梯化技术 ,操作简便、易行 ,投资少 ,见效快。 During the three years from 1997 to 1999, under the field production conditions, the environmental effect of stepwise conversion of arid lands in Karst mountainous areas in Guizhou Province was studied. The results showed that soil erosion and desertification could be prevented and controlled. For the arid slopes of more than 25 degrees, Returning land to forests and preparing better site conditions; increasing the yield of grain crops of less than 25% of the dryland cultivated land to nearly 20%, providing material guarantee for the smooth returning of cultivated land to steep slopes; , Less investment, quick.