【摘要】 土壤湿度空间变异性和样本容量决定了其测定的误差范围和精度。通过样本容量各为１５的各层次土壤含水率的统计分析，得到了１ｍ土层各层次的土壤含水率的变异特征。找出了样本容量与测试精度要求及统计特征值的关系。指出，过少的样本容量无法达到研究所需的精度要求。一般最少要５～８个以上的样本容量方可将测试的相对误差控制在５％～１０％以下。更多还原

【Abstract】 The space variations of soil moisture and sample contents are decisive factors to the error ranges and accuracies of the determination. With the statistic analysis of different soil water content rates in samples with the content of 15, the variation characteristics of different soil water content rates at 1 m soil layer are obtained.And the relationship between the sample content, and the measurement accuracy requirement and characteristic value is found out. Also this paper points out that limited numbers of sample contents can’t meet the accuracy requirements in research. In general, at least 5～8 sample contents can possibly keep the relative error of the measurement under 5%～10%.更多还原