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一、分布与形成条件旱地红土的前身是自然土壤中的红壤.红壤在云南分布很广,而且具有明显的地带性.从平面看全省,一般是北部少,中部、南部较多;从垂直分布看,是高山区、坝区较少,丘陵台地半山区和坝边缓坡较多.据初步统计,红壤约占全省自然土壤的一半左右,垦为耕地后所形成的旱地红土约占旱地面积的三分之一.主要分布在海拔500—2500米一带,年平均气温14—16℃,雨量750—1500毫米,相对湿度小于75%,干温季明显,在这种气候影响下,加之省内大部分属高原山区,区域性排水良好,且少受地下水影响,不同的成土母岩
First, the distribution and formation of conditions Dryland laterite is the red soil in natural soil.Red soil in Yunnan is widely distributed, and has obvious zonation.From the plane to see the province, generally less northern, central and southern more from the vertical According to the preliminary statistics, the red soil accounts for about half of the province’s natural soil, and the dry land red clay formed after reclaiming the cultivated land accounts for about half of the dry land One third of the area.Is mainly distributed in the 500-2500 meters above sea level area, the annual average temperature of 14-16 ℃, rainfall 750-1500 mm, relative humidity less than 75%, dry and warm season obvious, under the influence of this climate, coupled with Most of the province is a plateau mountainous region, the regional drainage is good, and less affected by groundwater, different soil into rock mother