西南丘陵区坡地土壤水分的时空变异

利用地统计学方法研究了我国西南丘陵区坡地土壤水分特性的时空变异特性。土壤水分含量在不同季节和不同层次具有一定的空间结构,可用纯块金效应模型、指数模型和球状模型进行拟合;土壤平均含水量、剖面各层含水量和半方差参数除变程外均随季节表现出明显的变化,但随土壤层次无明显的变化规律;土壤含水量的空间相关性随季节呈波动变化,块金值的变化趋势与基台值相似。克立格插值结果显示不同季节土壤平均含水量的空间分布格局不同。

Spatio-temporal Variability of Soil Water Content in Sloping Field of the Southwest Upland

Spatio-temporal variability of soil water content was studied with geo-statistical method in sloping field of the Southwest upland.Results show that soil water content has different spatial structures in different soil layers and different seasons in our study area.They can be simulated with pure nugget effect model,linear model,exponential model and spherical model.Mean soil water content,water content and parameters of the semi-variogram except the range are changing with the season,but they have not apparent changing rule according with different layers.Spatial relativity of the soil moisture is fluctuating with the season.Changing trend of the nugget of the soil moisture content is similar to the sills.Mean soil water content has different spatial distribution according to the Kriging.