论文部分内容阅读
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。
Taking the Chanan Irrigation Area of Ili River valley as the research area, the soil conductivity and soil salt content at 0 ~ 30 cm, 30 ~ 60 cm and 60 ~ 100 cm were obtained by the combination of EM38 conductivity meter and laboratory analysis. On the one hand, simple salinization classification of soil salinity was carried out in each soil layer. On the other hand, the geostatistics method was used to analyze the characteristics of soil salinity by semi-variance and spatial interpolation. The preliminary study shows that the coefficient of variation of soil electrical conductivity in Chanan Irrigation District is 1.31 and the coefficient of variation of soil salt content in each soil layer is 1.31, 1.10 and 1.49, respectively, showing strong spatial variations; 0-30 cm, 30-60 cm and 60-100 cm In the soil layer, the proportion of saline soil is 25.37%, 21.79% and 12.11% respectively, forming a more obvious salinization trend. On the spatial distribution, soil conductivity and soil salinity content range from northwest to southeast of the irrigation area The overall trend shows a decrease. In addition, the study found that soil salinity factors in irrigation districts have a strong spatial correlation, the spatial variation pattern is mainly the result of structural factors.