库尔勒普惠地区盐碱土壤的物理化学性质与低渗水性的关系分析

Physicochemical properties analysis on the Relationship between Physicochemical properties and Low Permeability of Saline Alkali Soil in Kuerle Puhui Area

以天山南麓库尔勒普惠地区的盐碱土壤为研究对象,现场调研结合室内测试分析该地区的三类土壤的理化性质,包括盐基离子组成、pH值、电导率、钠吸比等指标,结果表明:砂质土壤、砂壤质土壤和黏质土壤,盐碱化的程度依次变高,其中砂质土壤地表电导率平均值1.06 MS/cm,pH值平均水平在7.69,表明该类土壤基本没有盐碱化;砂壤质土壤地表电导率平均值2.27 MS/cm,pH值平均水平7.49,该类土壤属于轻度盐化;黏质土壤的含盐量在4%~6%之间属于重度盐土,电导率超过7.0 MS/cm且pH值平均超过8.0,伴随微度碱化现象,该类土壤低渗水性的成因,主要和土壤机械组成颗粒的大小地下水位高低及气候密切相关。

Taking the saline alkali soil in Kuerle Puhui area at the south foot of Tianshan Mountain as the research object,the physical and chemical properties of three kinds of soil in this area are analyzed by field investigation and indoor test,from the perspectives of base ion composition,pH value,electrical conductivity,and sodium absorption ratio.The results show that the degree of salinization of sandy soil,sandy loamy soil and clayey soil increases in turn,in which the average electrical conductivity of sandy soil is 1.06 MS/cm and the average pH value is 7.69,indicating that this kind of soil is basically not salinized;the average conductivity of sandy loamy soil is 2.27 MS/cm and the average pH value is 7.49,showing that this kind of soil belongs to mild salinization;the salt content of clayey soil is about 0.4%~0.6%,manifesting that it belongs to heavy saline soil.The conductivity exceeds 7.0 MS/cm and the pH value exceeds 8.0.With the phenomenon of micro alkalization,the cause of low permeability of this kind of soil is closely related to the size of soil mechanical particles,the height of groundwater level and climate.