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根据2009年伊犁河灌区土壤监测和取样分析资料,运用半方差函数与克里格插值法,对伊犁河灌区灌溉期与非灌溉期土壤盐分含量变异特征进行了分析。结果表明:研究区耕层土壤53.68%样地呈非盐渍化土壤,18.38%为轻度盐渍化,13.97%为中度盐渍化,8.82%为重度盐渍化,5.15%为盐土。土壤盐渍化类型主要为硫酸盐渍土为主,占53.68%。盐分组成中,阴离子以SO42-、Cl-为主,阳离子以Na+、Ca2+离子为主。土壤含盐量与Cl-、SO24-分别为极显著、显著正相关,揭示了土壤盐分含量大小与Cl-、SO42-含量水平的高低有关。表层土壤平均含盐量占0～60cm土层平均含盐量的60.19%,即土壤盐分垂直分布呈现强烈表聚性。各时期各层土壤盐分拟合的理论模型都符合球状模型。在空间尺度上,土壤含盐量从研究区的东、北、南边区域向研究区中西部方向有增加的趋势。从时间尺度来看,6月表层土壤含盐量比3月土壤含盐量大,各月耕层土壤含盐量几乎差不多。灌溉期与非灌溉期土壤含盐量的空间变化主要表现为表层土壤含盐量的变化。
According to the data of soil monitoring and sampling in Yili River Irrigation Area in 2009, the variation characteristics of soil salt content in irrigated and non-irrigated areas in Yili irrigated area were analyzed by semi-variance function and Kriging interpolation method. The results showed that 53.68% of the topsoil in the study area was non-salinized soil, 18.38% was mild salinization, 13.97% was moderate salinization, 8.82% was severe salinization and 5.15% was saline soil. Soil salinization types are mainly sulfated soil, accounting for 53.68%. Salt composition, the anion to SO42-, Cl-based cation to Na +, Ca2 + ions. The soil salinity was significantly and positively correlated with Cl- and SO24-, respectively, revealing that the content of soil salinity was related to the levels of Cl- and SO42-. The average salt content of surface soil accounts for 60.19% of the average salt content of 0 ~ 60cm soil layer, that is, the vertical distribution of soil salinity shows a strong surface aggregation. The theoretical model of soil salinity fitting at all levels in each period accords with the spherical model. On the spatial scale, soil salt content tends to increase from the east, north and south of the study area to the middle and west of the study area. From a time scale point of view, the salinity of topsoil in June was higher than that in March, and the salinity of topsoil in each month was almost the same. The spatial variation of soil salinity during irrigation and non-irrigation periods was mainly due to the change of soil salinity.