典型毛乌素沙漠-黄土高原过渡带土壤盐渍化空间异质性及其影响因素

发布时间：2019-04-02 21:37

【摘要】：毛乌素沙漠-黄土高原过渡带土壤盐渍化的空间异质性和生态学过程,对沙荒地整治的机理研究具有重要的意义.以毛乌素沙漠-黄土过渡带为研究区,结合布点取样和室内分析,运用经典统计学和地统计学方法对其pH、电导率、全盐含量的空间异质性进行分析.结果表明:1)土壤pH、电导率、全盐含量的平均含量分别为8.44、5.13 mS·cm~(-1)和21.66 g·kg~(-1),变异系数范围为6.9%~73.3%,pH属于弱变异,电导率和全盐含量属于中等程度变异.2)半方差分析结果显示,3个指标的空间变异性的最佳拟合模型均为球形模型,块金值/基台值比值范围为8.6%~14.3%,均具有强烈的空间自相关性,结构性因素对变异起主导作用;变程由小到大表现为pH全盐电导率.克里金插值图显示,pH、电导率、全盐含量整体呈条带状分布,连续性较好.pH值表现出随着地势的升高而升高的特点,而电导率和全盐含量则表现出随着地势的升高而降低的特点.3)在垂直分布上,重度盐渍化区域的盐分有表聚现象,轻度盐渍化区域盐分垂直分布为先减少后增大.毛乌素沙漠-黄土过渡带土壤盐渍化的空间变异性与气候、地质条件、地形地貌、水文地质条件、植被分布等有关,以地形因素和水文地质条件的影响为主.
[Abstract]:The spatial heterogeneity and ecological process of soil salinization in the transitional zone between the Maowusu Desert and the Loess Plateau are of great significance for the study of the mechanism of desert remediation. The spatial heterogeneity of pH, conductivity and total salt content in Maowusu desert-loess transitional zone was analyzed by classical statistics and geostatistical methods combined with distribution sampling and indoor analysis. The results were as follows: 1) the average conductivity and total salt content of soil pH, were 8.44, 5.13 mS cm~ (- 1) and 21.66 g kg~ (- 1), respectively. The coefficient of variation was 6.9% ~ 73.3%. The results of semi-variance analysis showed that the best fitting models of spatial variability of the three indexes were spherical model, and the ratio of block gold value to platform value was 8.6% ~ 14.3%. All of them have strong spatial autocorrelation and structural factors play a leading role in the variation. The variation range from small to large is the conductivity of total salt of pH. The Kriging interpolation chart shows that the conductivity and total salt content of pH, are distributed in a strip and the continuity is good. The pH value increases with the increase of the topography. The electrical conductivity and total salt content decreased with the increase of the topography. 3) in the vertical distribution, the salt content in the heavily salinized area was superimposed, and the vertical distribution of the salt content in the mild salinized region decreased first and then increased. The spatial variability of soil salinization in Maowusu desert-loess transitional zone is related to climate, geological conditions, topography, hydrogeological conditions, vegetation distribution and so on, mainly influenced by topographic factors and hydrogeological conditions.
【作者单位】：陕西省土地工程建设集团有限责任公司;陕西地建土地工程技术研究院有限责任公司;国土资源部退化及未利用土地整治工程重点实验室;
【基金】：陕西省重点科技创新团队计划项目(2016KCT-23)资助~~
【分类号】：S156.41

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