不同土质灌区土壤盐分与物理特性空间变异规律及协同关系研究

Research on the Spatial Variability and Synergism of Soil Salt and Physical Properties in Different Soil Irrigation Areas

为探究土壤盐分空间特性,以鄂尔多斯黄河南岸灌区不同土质的两个灌域为研究对象,采用经典统计学与地质统计学相结合的方法对0~20 cm土层土壤电导率与土壤物理特性参数间的关系进行分析研究。研究结果表明:两灌域0~20 cm土层土壤电导率均可以采用高斯模型进行半方差分析拟合。砂土灌域土壤电导率为中等变异程度,中等空间相关性,电导率与黏粒含量、土壤容重、含水量、导热率及热容量显著正相关,相关范围约2~6 km;与砂粒含量显著负相关,相关范围约2.5~4 km。砂壤土灌域土壤电导率为中等偏强变异程度,较强空间相关性,电导率与土壤物理特性空间相关性较低,土壤盐渍化程度高于砂土灌域。

In order to explore the spatial characteristics of soil salt,two sub-districts with different soil properties in the south bank irrigation area of the Yellow River in Ordos were chosen.The relationship between soil surface salinity and soil physical parameters was analyzed by using classical statistics and geo-statistics methods.The conductivity of 0~20 cm soil in both irrigation areas can be fitted with a semi-variance function using a Gaussian model.In sandy sub-district,the soil electrical conductivity is positively correlated with clay content,bulk density,moisture content,thermal conductivity and heat capacity,the correlation range is about 2~6 km.On the other hand,the soil electrical conductivity is negatively correlated with sand content,and the correlation range is about 2.5~4 km.In sandy loam sub-districts,the spatial correlation between soil electrical conductivity and physical properties is relatively low.