Purple soil classified as regosols in fao soil taxonomy and pup - cambols in china soil taxonomy , is one of well known soil types with the particularities such as weathering easily , high natural fertility , etc . , and feeding population of 500 / km2 . however , it often meets the water disasters ( sporadic flooding and serious seasonal drought ) 摘要紫色土是世界上一种特殊的土类，集中分布于四川盆地，以其易成土性和富盐基性(自然肥力高)养育着500人以上平方公里的人口而著称于世，但是它分布的区域存在严重的季节性干旱和时有发生的洪灾等水问题。
