瘦红壤是云南主要低产土壤之一。全省约有三百万亩,主要分布在滇中、南一带的山区、半山区。这种土壤在形成早期,因高温多雨,强度淋溶,碱金属、碱土金属元素大量流失,高价铁、铝相对大量积累,使整个土体呈红色,含有不少铁质结核,土壤呈强酸性反应。瘦红壤多分布在陡坡或缓坡地带, Thin red soils are one of the major low-yielding soils in Yunnan. The province has about three million mu and is mainly located in the mountainous areas and mid-mountain areas in central Yunnan and southern China. The early formation of this kind of soil resulted from a large amount of loss of alkali metal and alkaline earth metal elements due to the high temperature and raininess, the leaching of heavy metals, and the large amount of high-valent iron and aluminum accumulating, making the entire soil red and containing many iron-bearing tuberculosis and the soil was strongly acidic reaction. Thin red soil and more distributed in steep slopes or gentle slope,