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通过对灌区田间原状土样进行室内测试 ,并对测得的土壤水分特性值进行经典统计分析 ,得出土壤水分参数的统计特征值 ,这些参数近似为正态分布和对数正态分布 ,并对土壤水分参数进行地质统计学分析 ,绘出各参数值的半方差图和等值线图。根据研究分析结果 ,确定采用田间土壤饱和含水量和田间持水量作为评价分析参数。在灌溉决策系统中 ,根据半方差图确定观测点间距 ,从评价参数等值线图确定观测点在田间的位置。该研究方法对灌溉决策使用中子水分仪 (或 TDR)确定田间观测点的间距和位置有理论上的指导意义
Through the indoor testing of the undisturbed soil samples in the field and the classical statistical analysis of measured soil moisture characteristics, the statistical eigenvalues of soil moisture parameters are obtained. These parameters are approximately normal distribution and lognormal distribution Geostatistical analysis of soil moisture parameters, plotting the values of the semi-variogram and contour plots. According to the results of the research and analysis, the saturated soil moisture content and the field water holding capacity were determined as the evaluation parameters. In the irrigation decision-making system, the distance between observation points is determined according to the semi-variance map, and the position of the observation point in the field is determined from the contour map of evaluation parameters. This method is of theoretical guidance for determining the spacing and location of field observation points using neutron moisture meters (or TDRs) for irrigation decisions