江西大岗山3种林型土壤水分物理性质研究

对江西大岗山林区常绿阔叶林、杉木人工林和毛竹林土壤的容重、孔隙度、持水量和贮水量等物理性质进行了研究。结果表明:(1)常绿阔叶林、毛竹林和杉木人工林的土壤容重均随深度的增加而增加。在0~80 cm的土层中,杉木人工林、常绿阔叶林和毛竹林的土壤容重分别为1.29 g/cm3,1.24 g/cm3和1.20 g/cm3。(2)随土层深度的增加,3种林型土壤的总孔隙度、毛管孔隙度、饱和持水量和毛管持水量均逐渐降低。(3)在0~80 cm的土层中,常绿阔叶林的土壤总孔隙度和非毛管孔隙度最大,毛竹林次之;而常绿阔叶林土壤的毛管孔隙度最小,毛竹林最大。(4)在0~80 cm的土层中,3种林型土壤的饱和持水量、毛管持水量和非毛管持水量均为毛竹林>常绿阔叶林>杉木人工林。在0~80 cm的土层中,3种林型土壤的现有贮水量和饱和贮水量均为常绿阔叶林>杉木人工林>毛竹林。(5)毛竹林在0~40 cm土层中,土壤物理性质明显优于另外两种林分。

Soil Moisture Physical Characteristics of Three Forest Types in Dagangshan Mountain in Jiangxi Province

Research on soil bulk density,soil porosity,soil water retaining capacity and soil water storage of evergreen broad-leaved forest,Cunninghamia lanceolata and Phyllostachys pubescens stands was carried out in Dagangshan mountain in Jiangxi province.The results showed that:(1) The soil bulk density of three forest types increased with the increment of soil depth.In the layer of 0~80 cm,the soil bulk density of Cunninghamia lanceolata,Phyllostachys pubescens stands and evergreen broad-leaved forest was 1.29 g/cm3,1.24 g/cm3,1.20 g/cm3 respectively.(2) With the increment of soil depth,total porosity,capillary porosity,saturated moisture capacity,capillary holding capacity decreased gradually.(3) In the layer of 0~80 cm,the soil total and uncapillary porosity of evergreen broad-leaved forest was largest and that of Phyllostachys pubescens stands was least.However,the soil capillary porosity of evergreen broad-leaved forest was lowest and that of Phyllostachys pubescens stands was highest.(4) In the layer of 0~80 cm,the order of soil saturated,capillary and uncapillary holding capacity on soil was Phyllostachys pubescens stands,evergreen broad-leaved forest and Cunninghamia lanceolata.In the layer of 0~80 cm,the sequence of soil present and saturated water storage was Phyllostachys pubescens stands,evergreen broad-leaved forest and Cunninghamia lanceolata.(5) In the layer of 0~40 cm,the physical characteristics of Phyllostachys pubescens stands were obviously better than those of the other two.