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根据森林生态系统定位研究数据，采用土壤本分测值标准差、标准差检验值、相关系数和变异系数．对杉木人工幼林土壤水分的动态特征进行了研究．结果表明：杉木人工幼林与成熟林相比，土壤蓄水能力较弱，水源涵养能力较差，在0～30cm土层，幼林地土壤含水量低于对照地和间伐地，而变幅则高于对照地和间伐地；在较深的根系分布层．情况则相反；幼林地不同层次土壤水分变化相似性趋大，各层次间土壤含水量差异也变小，对水分的调节和缓冲能力变差；依据土壤水分测值标准差、标准差检验值．相关系数和变异系数4个指标，可将土壤水分垂直分布划分为：土壤水分速变层、土壤水分活跃层、土壤水分次活跃层3个层次．并将土壤水分季节变化划分为相对稳定期、补偿期和损耗期.
According to the research data of forest ecosystem positioning, standard deviation, standard deviation test value, correlation coefficient and coefficient of variation of soil subdivision were used. The dynamic characteristics of soil moisture in Chinese fir young plantations were studied. The results showed that compared with mature plantation, the young plantation of Cunninghamia lanceolata had lower soil water storage capacity and poor water conservation ability. Soil water content in 0-30 cm soil layer and young forest was lower than that of control and thinning, Control and thinning; in the deeper root distribution. In contrast, the changes of soil moisture in different layers of young forest tended to be similar, and the differences in soil water content between different layers also became smaller. The regulation and buffering capacity of soil moisture deteriorated. Based on the soil moisture standard deviation and standard deviation test values. Correlation coefficients and coefficient of variation of four indicators, the vertical distribution of soil moisture can be divided into: soil moisture rapidly changing layer, soil moisture active layer, soil moisture sub-active layer three levels. The seasonal variation of soil moisture was divided into relatively stable period, compensation period and loss period.