表层土壤盐分空间变异性及合理采样数与信息估计

Spatial Variability of Soil Salt on the Upper Layer and Its Retional Sampling Number

本文以气候寒冷干燥、具有土壤盐碱化问题的中国河套灌区为背景，将地质统计学和经典统计学理论结合评价实验场土壤表层盐分的空间分布特征及其变异性。用经典统计学理论确定了土壤盐分田间监测的合理采样数目与空间采样法则。在用地质统计学理论对变差函数理论模型最优性检验基础上，采用ＯＫ法对实验场表层土壤盐分空间分布进行了最优无偏估计。结果表明ＯＫ法用于内插估计精度较高；而用于外推估计精度略低，需对误差进行控制方可适当外推。以便利用样本对总体进行估计，并指导野外采样与监测。

Taken the salinized soil problems in Hetao irrigation district with cold andarid climate as a background,the distribution characteristics and spatial variability ofsoil salt on the upper layer were studied by combined the geostatistics with the classicalstatistics in this papers.The soil salt sampling numbers and sampling rules in the fieldwere determined by the statistics.After checked the optimality of the variance model bythe geostatistics,the soil salt on the upper layer in the experiment aero were estimatedby the optimum and undeviation Kriging method(OK Method).The result shown thatthe precision will be higher when OK method used in interpolation. But,the precisionwill be a little lower when used in extension and the error should be control when OKmethod used to extend.