武陵山区小流域马尾松天然林土壤水分动态研究

Dynamics of Soil Water Under Pinus massoniana Natural Forest in Wuling Mountain Area

利用TDR定位监测的方法,研究武陵山区马尾松天然林土壤水分分配规律。结果表明:在空间分布上,土壤各层含水量随土层深度的增加而改变。降雨后土壤水分损失率与干旱天数存在曲线函数关系(P<0.05)。不同土层间土壤水分变异系数随着干旱时间的推后显示递增趋势,但趋于平缓。

By using the time domain reflectometry（TDR ）, and based on the data collected from Feb, 2015 to Oct, 2015, the paper conducted a study on the dynamics of soil water under Pinus massoniana natural forest in Wuling Mountain Area.The results indicated that in terms of spatial distribution,its soil water content changed with increasing soil depth.The soil water loss rate after rain had a significant hyperbolic relationship with durative droughty days, which soil water storage had a significant linear negative relationship with this duration （P〈0.05）.With the extension of drought duration after rain, soil water loss tended to vary gently with increasing soil depth.Soil water was correlated significantly （ P〈0.05 ） with relative rainfall （R）, air temperature （ t）, vapor pressure deficit （ VPD ） and relative humidity （RH）.