伊犁河谷察南灌区土壤盐分空间变异研究

发布时间：2018-08-04 09:06

【摘要】：以伊犁河谷察南灌区为研究区,运用EM38电导率仪测定及室内分析相结合的手段,获取土壤电导率值及0~30 cm、30~60 cm、60~100 cm土壤盐分含量。一方面对各土层土壤盐分含量进行了简单的盐渍化分级统计,另一方面应用地统计学方法,对土壤盐分特征因子进行半方差函数分析及空间插值分析。初步研究表明:察南灌区土壤电导率变异系数为1.31,各土层土壤盐分含量变异系数分别为1.31、1.10、1.49,均呈现空间强变异;0~30cm、30~60 cm、60~100 cm土层土壤中,盐化土所占比例分别为25.37%、21.79%、12.11%,形成了比较明显的盐渍化趋势;在空间分布上,土壤电导率及土壤盐分含量自灌区西北至东南方向总体呈现减小的趋势。另外,研究发现灌区各土壤盐分因子具有强烈的空间相关性,空间变异格局主要是结构性因素作用的结果。
[Abstract]:The soil conductivity value and soil salt content of 0 ~ (30) cm ~ (30) ~ (30) ~ (60) ~ (60) cm ~ (60) ~ (-1) ~ (100 cm) were obtained by means of EM38 conductivity measurement and laboratory analysis in Chanan Irrigation area of Yili River Valley. On the one hand, simple salinization classification statistics of soil salt content in each soil layer were carried out. On the other hand, the semivariance function analysis and spatial interpolation analysis of soil salt characteristic factors were carried out by using geostatistics method. The preliminary study shows that the coefficient of variation of soil conductivity is 1.31, and the coefficient of variation of soil salt content is 1.31 ~ 1.10 ~ 1.49 in Chanan Irrigation area. All of them show strong spatial variability in the soil layer of 30 ~ 60 cm ~ 60 cm ~ (-1) ~ 100 cm soil layer, and the variation coefficient of soil salt content in each soil layer is 1.31 ~ 1.10 ~ 1.49 cm ~ (-1). The proportion of salinized soil was 25.37, 21.79 and 12.11, respectively, which formed an obvious salinization trend, and the soil electrical conductivity and soil salt content decreased from the northwest to the southeast of the irrigated area in terms of spatial distribution. In addition, it was found that there was a strong spatial correlation among soil salinity factors in irrigated areas, and the spatial variation pattern was mainly the result of structural factors.
【作者单位】：中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室;中国科学院大学资源与环境学院;中国科学院南京土壤研究所;新疆国土资源规划研究院;
【基金】：新疆维吾尔自治区科技厅科技计划项目(伊犁河谷盐渍土壤磁感式快速精量诊断评估技术研究)(201531116) 新疆优秀青年科技人才培养项目(qn2015yx033)资助
【分类号】：S156.41

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