干旱区绿洲土壤pH值与电导率的空间变异研究

发布时间：2018-05-10 09:42

本文选题：空间变异 + 土壤pH值与电导率　；参考：《西南农业学报》2016年11期

【摘要】：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。
[Abstract]:In this paper, the spatial variability of soil pH and electrical conductivity was studied by taking Weigan River and Kuqa River Delta oasis as the research object, through field sample collection, indoor analysis and statistical analysis. The results showed that the pH value of the soil in the study area was larger than 20 ~ 40 cm soil layer, and the value was larger than 0 ~ 20 cm soil layer, while the electrical conductivity changed significantly in 0 ~ 20 cm soil layer. The spatial differentiation of soil electrical conductivity and pH value of soil layer above 20 ~ 40 cm soil layer and 20 ~ 40 cm soil layer is the result of the combination of structural factors and random factors, while the soil pH value of 0 ~ 20 cm soil layer is mainly affected by random factors. As a result, the soil pH value has a certain degree of spatial variability. 3. The high value of soil conductivity is concentrated in the east, the soil conductivity is washed by Wei-reservoir oasis, and the middle part of the alluvial fan plain increases gradually. In the 0 ~ (20 cm) soil layer, the soil in the north, northeast and east of the study area was alkaline, while in the 20 ~ 40 cm soil layer, in the northwestern and southern part of the study area, the soil was alkaline. The central part of the study area and most of the other areas were neutral. By studying the spatial variation of soil pH and electrical conductivity in Kuqa River Delta of Weigan River, the salinization characteristics and spatial pattern distribution of oasis soil can be evaluated effectively. In order to maintain the health of the oasis ecosystem and the improvement of saline-alkali land provides the reference basis.
【作者单位】：新疆师范大学地理科学与旅游学院;新疆维吾尔自治区重点实验室"新疆干旱区湖泊环境与资源实验室";
【基金】：国家自然科学基金“新疆渭干河流域土地利用/土地覆盖生态风险及预警研究”(41261051);国家自然科学基金“塔里木盆地北缘绿洲-荒漠过渡带植被对土壤盐渍化的响应研究”(41561051) 新疆维吾尔自治区重点实验室“新疆干旱区湖泊环境与资源实验室”开放基金(XJDX0909-2013-04)
【分类号】：S156.4

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