不同季节渭干河-库车河典型三角洲绿洲土壤盐分离子空间变异特征研究(英文)

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。

Spatial Variability of Salt Ions in Soils in Oasis of Delta of Weigan River-Kuqa River in Different Seasons

Objective] The aim was to research the spatial variability of salts’ ions in soils of oases of Weigan River-Kuqa River to explore spatial correlation among soil ions and effects of seasonal changes on distribution of eight ions in soils. Method] Based on soil salinizaiton, temporal and spatial distributions of eight ions in surface soils were researched and distribution maps were drawn with the help of classical statistics and geostatistics. Result] All contents of salt ions were proved in consistent with normal distribution by K-S test, and variability of the ions changed with season, for example, variability of ions in soils in October was higher than that in April, which might be caused by little rainfall and high evaporation in October. It can be concluded from semivariance analysis that salt ions were all of high spatial autocorrelation. In addition, it can be concluded from spatial distribution that spatial structures of most ions are reasonable, except Ca2+ and Mg2+ in soils collected in April of 2010 and Mg2+ in October of 2010, which were more suitable for linear model, and chloride-sulfate dominated in salinized soils in the researching area. Conclusion] The research laid foundation for partition, improvement and use of salinized soils in delta of Weigan River-Kuqa River.