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[目的]对渭干河-库车河典型绿洲范围内的土壤盐分离子空间变异进行研究,以期了解该三角洲土壤离子的空间相关性,揭示季节变化对土壤8大离子分布的影响。[方法]针对目前存在的土壤盐渍化问题,以渭干河-库车和典型三角洲绿洲为研究区,运用经典统计学和地统计学相结合的方法研究了表层土壤8大离子含量的时空变异特征,绘制了土壤盐分离子的随机性和结构性的空间分布图。[结果]在研究区中所有盐分离子含量数据经K-S检验均符合正态分布,不同季节的盐分离子含量变异性不同,10月的变异性高于4月,这可能是是由于10月降雨量小于4月,盐分离子随着强蒸发被带到土壤表面,盐分离子含量高;半方差分析得出盐分离子均表现为高强度的空间自相关性,但程度有所差异;空间分布特征表明,大部分盐分离子的空间结构性都较好,但2010年4月采集土样的Ca2+和Mg2+以及2010年10月份采集土样的Mg2+均适合线性模型,所以空间结构性较差,同时也表现出研究区特有的土壤盐分分布特征,这与研究区盐渍化主要是氯化物-硫酸盐型相一致。[结论]该研究结果为渭干河-库车河三角洲盐渍化土壤的分区、改良和利用提供了理论基础。
[Objective] The research aimed to study the spatial variation of soil salt ions in the typical oasis of Weigan-Kuqa River in order to understand the spatial correlation of soil ions in this delta and reveal the influence of seasonal variation on the distribution of 8 ions in soil. [Method] Aiming at the existing problems of soil salinization, taking the Weigan River - Kuqa and the typical delta oasis as the study area, the space-time of the 8 large ions in the surface soil was studied by using the combination of classical statistics and geo-statistics. Variation characteristics of soil salt ions drawn random and structural spatial distribution map. [Result] The data of all the salt ions in the study area were normalized by KS test. The variability of salt ion content was different in different seasons, and the variability in October was higher than that in April. This may be due to the precipitation in October In less than April, the salt ions were brought to the soil surface with strong evaporation, and the content of salt ions was high. The semi-variance analysis showed that the salt ions showed high intensity spatial autocorrelation, but the degree was different. The spatial distribution showed that, Most of the salt ions have good spatial structure, but Ca2 + and Mg2 + collected in April 2010 and Mg2 + collected in October 2010 are suitable for the linear model, so the spatial structure is poor, and also shows The characteristics of soil salinity distribution in the study area are consistent with the salinization of the study area, which is mainly chloride-sulfate type. [Conclusion] The results of this study provided the theoretical basis for the division, improvement and utilization of salinized soils in Weigan - Kuqa River Delta.