云南旱地红壤的占耕地面积的一半。是高温、多雨、干湿季节明显的亚热带生物气候作用下的产物。由于土壤中矿物的强烈风化,使红壤脱硅富铝化作用强。加以生物循环迅速,使红壤的有机质分解快,累积少。这两种既矛盾又统一的成土过程,一方面赋予红壤有较高的生产力,另方面又留给红壤 Red soil in Yunnan dry land accounted for half of the area. Is the high temperature, rainy, wet and dry seasons obvious subtropical bioclimatic products. Due to the strong weathering of the minerals in the soil, the desilication and the enrichment of red soils are strong. To bio-cycle quickly, so that decomposition of organic matter in red soil fast, less accumulated. These two contradictory and unified processes of soil formation give red soil a higher productivity on the one hand and red soil on the other