不同成土母质及土地利用对红壤机械组成的影响

Impact of Parent Material and Land Use Type on Mechanical Composition of Red Soil

土壤机械组成是土壤最基础的资料之一,在土壤结构性等方面扮演重要角色,它受到成土母质、气候、地形、生物和人类活动等因素影响。根据《中国土种志》及部分地方土壤志记载的333个红壤剖面数据,研究了红壤机械组成受成土母质和土地利用的影响程度。结果表明:成土母质和土地利用均可以对红壤机械组成产生影响;成土母质与土地利用相比,前者对于红壤机械组成的影响更为深刻;土地利用对红壤机械组成影响不大。成土母质对红壤机械组成的解释程度随着深度的增加而增大,可解释红壤机械组成变异的25%左右。研究成果可为红壤性质的研究以及红壤的改良与农业利用提供理论支持。

The mechanical composition is a most basic information of soil and plays important role in soil structure. It is affected by parent material,climate,topography,biological activity and human activity.According to 333 red soil profile data from Records ofSoil Types in China and some local soil records,we researched the degree of parent material and land use influence on the mechanical composition of red soil.Results reveal that both parent material and land use have some impact on the mechanical composition,but the former has larger impact than the latter does.Parent material explains 25% of the mechanical composition variation,and that number increases with soil depth increase.This research is a theoretical support for red soil improvement and application.