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[目的]探明人工桉林的土壤孔隙状况及水分含量变化影响因子,为华南红壤丘陵区桉树种植生产中土壤水分利用提供参考依据。[方法]在相同气候区内,按上中下不同坡位,采集表土层(A)、淀积层(B)和母质层(C)3个不同剖面发生层的土壤,测定人工桉林、天然林、松林的土壤孔隙度和水分,并在垂直和水平方向分析土壤水分含量的差异状况及影响因子。[结果]A、B、C 3层的人工桉林、天然林与松林的土壤孔隙度平均值分别为45.9%和41.4%、55.3%,水分平均值分别为13.3%、13.4%和15.5%,这3种林分的土壤水分在剖面上和坡位上不存在显著差异(P>0.05),但不同林分间的表层土壤水分存在显著差异(P<0.05);在水平方向上,总盖度与土壤水分存在极显著正相关。[结论]冠层及草本、落叶层的总盖度是林分表层土壤水分变化的主控因素之一。
[Objective] The research aimed to find the influencing factors of soil pore state and moisture content in artificial eucalyptus forest, and provide reference for soil water utilization in eucalyptus planting in hilly red soil region of South China. [Method] In the same climatic zone, according to the upper and lower slope positions, the soil layers of topsoil (A), sedimentary layer (B) and parent material layer (C) Natural forest, and pine forest soil porosity and water content, and analysis of vertical and horizontal directions of soil moisture content of the differences and impact factors. [Result] The average values of soil porosity of artificial eucalyptus, natural forest and pine forest in A, B and C 3 layers were 45.9% and 41.4% and 55.3% respectively, and the mean values of water were 13.3%, 13.4% and 15.5% There was no significant difference (P> 0.05) between the soil moisture profiles and the slope positions of the three stands, but there was a significant difference in surface soil moisture between different stands (P <0.05). In the horizontal direction, the total cover Degree and soil moisture exist very significant positive correlation. [Conclusion] The total coverage of canopy, herbaceous and deciduous layers was one of the main controlling factors of soil moisture change on the surface layer of forest.