哀牢山常绿阔叶林土壤水分动态变化

利用哀牢山站常绿阔叶林内2005年土壤烘干水测定的观测资料,分析常绿阔叶林内土壤水分的季节和空间变化,以期了解本区域常绿阔叶林土壤含水量的变化特征。研究结果表明:①6—10月份土壤含水量较高,11—1月份次之,2—5月份较低;②随土壤剖面深度的增加,土壤含水量逐渐降低,上层土壤含水量变化幅度大于下层;③水平方向上研究区域不同位点土壤含水量差异变化不显著;④降雨是影响研究区域土壤含水量季节变化的主要因素,但土壤含水量的峰值出现的时间要滞后于降雨量峰值(6月)出现时间,8月土壤含水量最高。

Dynamics of Soil Moisture in Evergreen Broad-leaved Forest in Ailao Mountain

An experiment was conducted to study the spatial and seasonal variations in soil water content of evergreen broad-leaved forests by means of the data of ovendried soil from Ailao Mountain Ecology Station in 2005.The changing characteristics of soil water content were obtained.Results show that the soil water content is the highest during June and October,and then followed by the periods of November to January and February to May in order.The soil water content decreases with increasing soil depth,and the variation range of soil water content in the upper soil layer is bigger than that in the lower soil layer.The difference in soil water contents at different horizontal locations in the study area is not notable.Rainfall is the most important factor influencing soil water content, but the highest soil water content(in August) lags behind the rainfall peak(in June).