干旱区绿洲土壤pH值与电导率的空间变异研究

Study on Spatial Variability of Soil pH Value and Conductivity in Arid Oases

本文以渭干河-库车河三角洲绿洲为研究对象,通过野外样品采集,室内分析及统计分析对土壤p H值与电导率的空间变异性进行研究,结果表明：1研究区土壤p H值在20-40 cm土层具有较大变幅,且值大于0-20 cm土层,而电导率在0-20 cm土层变化显著,且数值高于20-40 cm土层。2土壤电导率和20-40 cm土层p H值的空间分异是由结构性因素和随机性因素共同作用的结果;而0-20 cm的土壤p H值主要受随机性因素的影响,造成土壤p H值具有一定程度的空间变异性。3研究区土壤电导率的高值集中分布在东部,土壤电导率由渭-库绿洲冲、洪积扇平原的中部向外递增。在0-20 cm土层中,研究区北部、东北部及东部的土壤偏碱性,在20-40 cm土层中,西北部、南部土壤偏碱性,研究区中部及其他大部分区域均偏中性。通过对渭干河库车河三角洲绿洲土壤p H值与电导率空间变异的研究,可对绿洲土壤盐渍化特征及其空间格局分布规律进行有效评价,以期为维护绿洲生态系统健康及盐碱地的改良提供参考依据。

Taking Weigan-Kuqa River Delta Oasis as the object of study,through the field samples,laboratory and statistical analysis of the spatial variation of soil p H value and conductivity were carried out.The results show that（i） The soil p H values in the study area had a large variation in 20-40 cm soil layer,and the value was greater than that of 0-20 cm,while the electrical conductivity of the soil layer in 0-20 cm was significantly higher than that in 20-40 cm soil layer.（ii） The spatial variation of soil electrical conductivity and p H values of 20-40 cm soil layer was determined by the structural factors and random factors,while the soil p H values of 0-20 cm were mainly influenced by random factors,which resulted in the spatial variability of soil p H values.（iii） The study area of soil electrical conductivity high concentration distribute in the East,soil electrical conductivity by the Weigan-Kuqa River Oasis alluvial plain in the middle of the outward increments.In the 0-20 cm soil layer,the soil in the north,northeast and east of the study area is alkaline,and in the 20-40 cm soil layer,the soil in the northwest and south of the soil is alkaline,and the middle part of the study area and most of the other regions are neutral.The study of the soil p H value and conductivity in Weigan-Kuqa River Delta Oasis can effectively evaluate the oasis soil salinization characteristics and spatial pattern of distribution,in order to provide reference for the maintenance the healthy of oasis ecosystem and the improve soil salinization.