贵州省威宁县3种典型土壤机械组成分析

指出了土壤机械组成是土壤物理性状的基础特征之一,深入探讨土壤机械组成对土壤学的研究和区域的土地利用具有重要意义。以贵州省威宁县3种典型土壤为研究对象,通过分析淀积层土壤的机械组成情况,探讨了不同成土条件及土壤类型对土壤机械组成的影响。结果显示:①不同成土母岩对土壤机械组成影响差异性显著,砂(页)岩发育土壤较碳酸盐岩和红色黏土发育土壤含砂量大;砂(页)岩发育土壤存在一个坡度区间(16-25°)黏粒含量低于砂粒含量,其他坡度区间黏粒含量大于砂粒含量,随坡度的增大黏粒含量增加砂粒含量减少;坡脚黏化特征比坡腰和坡顶明显。②不同的土壤类型对土壤机械组成影响差异性显著,暗红棕壤黏粒含量显著高于砂粒含量,土壤黏化特征最明显。从整体上看,威宁县土壤机械组成差异性显著。

Analysis of Mechanical Composition of Three Typical Soil Types in Weining County,Guizhou Province

Soil mechanical composition is one of the foundation of soil physical properties>and it aims to provide basic data for in—depth discussion on the physical and chemical properties of soil.The study investigated the soil mechanical composition of three typical soil in Weining county,Guizhou province.The results showed that:(1)The influence of soil mechanical composition on soil mechanical composition was significant,and the sand(page)rock development soil was larger than that of carbonate and red clay.There is a slope rock soil development interval(16 to 25°)clay content in sand(page),which is lower than the sand content.The clay content in other slope intervals is greater than the sand content.As the slope increases,the clay content increases and the sand content decreases;The viscosity of slope is more obvious than that of slope and slope.(2)Different soil types have significant influence on the composition of soil machinery,and the content of clayey grains in dark red brown soil is significantly higher than that of sand grains,and the characteristics of soil adhesion are most obvious.As a whole,the composition of soil machinery in Weining county is significant.