红壤坡地油茶林及自然恢复植被下土壤水势动态变化特征研究

利用野外定位观测数据，研究了红壤坡地油茶林及其自然恢复植被下土壤水势的时空动态变化规律。结果表明，土壤水势及其变异系数随深度的增加而增大，旱季土壤水势低于雨季；再分布过程中土壤水势动态变化主要受降雨量影响，油茶林30～110cm土壤水势变化幅度、变化速度大于同深度恢复区；随着裸地自然恢复成草丛，恢复区土壤水势变化强度较大的层次从0～10，0～20，0～30cm逐渐加深；降雨人渗及再分布过程中零通量面从表层至深层经历了发散与聚合型相互转换的循环过程，表明了不同层次土壤水分的上下交替运移规律；油茶林具有比恢复区复杂的零通量面类型及发生与迁移转变规律。

Dynamic Change of Soil Water Potential in Oiltea Camellia Wood and Its Natural Rehabilitation Land on Hillslope in Red Soil Region

Based on fixed observation on hillslope in red soil region,the spatio-temporal dynamic change of soil water potential in the oiltea camellia woods and their natural rehabilitation lands were analyzed.The results showed that soil water potential and its variation coefficient increased with the increase of soil depth,and soil water potential in the drought season was lower than that in the rainy season.The dynamic change of soil water potential during the process of redistribution was influenced mainly by rainfall amount,and its range and velocity below the depth of 30~110 cm in the oiltea camellia woods were higher than those of natural rehabilitation lands.The change of soil water potential intensified from 0~10 cm and 0~20 cm to 0~30 cm in natural rehabilitation land when vegetation coverage increased gradually.Zero flux planes had cyclic process between disconvergent of zero flux planes and convergent of zero flux planes from surface layer to deep layer during rainfall infiltration and redistribution,and the types and transformations of zero flux planes of oiltea camellia woods were more complicated than those of rehabilitation lands.