中文摘要：

利用TRIME—TDR获取烟台某果园0—30cm、0—60cm和0—100cm土层土壤水分，运用变异系数和相对偏差等方法研究土壤水分时间稳定性．结果表明，研究区大部分测点不同土层土壤水分在时间上的变异程度都属于中等变异；土壤水分时间稳定性随土层厚度增加而增强；基于土壤水分时间稳定性特征可确定研究区不同土层土壤水分平均值的代表性测点，且代表性测点的预测精度都较高；不同土层土壤水分平均值之间以及变异系数之间的相关性都较强，精度要求不高时，研究区0-60cm和0-100cm土层土壤水分平均值可分别用其代表性测点的土层土壤水分估算。

英文摘要：

Based on soil moisture at 0-30cm,0-60cm and 0-100cm soil layers in an orchard of Yantai,which was obtained with TRIME-TDR, temporal stability of soil moisture was studied with coefficient of variation and relative difference. The results show that variation degree of soil moisture at different soil layers is medium for most sampling site;temporal stability of soil moisture increases as thickness of soil layer increases;the representative sites of mean soil moisture at different soil layers in studied area can be determined based on temporal stability of soil moisture, and prediction accuracy of the representative sites is higher; correlation between mean soil moisture at different soil layers is strong, coefficient of variation of soil moisture at different soil layers also has strong correlation, when precision required is not high, mean soil moisture at 0-60cm and 0-100cm soil layers in studied area can be forecasted with soil moisture at upper soil layer in their corresponding representative site.