采集帽峰山地区典型小流域主要林地类型(青冈林、毛竹林、凤尾竹林、桉树林)原状土样进行土壤剖面(0~20 cm、20~40 cm、40~60 cm)渗透系数及其相关因子的实验研究，结果表明：各种林地类型土壤渗透系数在剖面上均表现出从上到下递减的特点，毛竹、青冈、凤尾竹、桉树林的土壤剖面渗透系数变化范围分别为13.64~4.91、10.49~3.63、8.16~2.96、7.92~3.71 m/d。由于20~40 cm、40~60 cm土层渗透系数差异性相对较小，土壤渗透性剖面可简化为上、下两个亚层，上部亚层渗透系数是下部亚层的1.89~2.42倍。各种林地类型土壤渗透系数与孔隙度、根密度呈正相关，与干容重呈负相关，与根径关系相关性方向具有不确定性。不同林地类型土壤渗透系数与干容重、根密度、根径之间的相关程度存在较大差异，但均表现出与孔隙度之间存在良好相关性。%The hydraulic conductivity and correlated factors of undisturbed soil profile(0~20 cm、20~40 cm、40~60 cm) are researched, by taking different forest types ( cyclobalanopsis chungii, phyllostachys pubescens, bambusa multiplex var. nana, eucalyptus forests) in typical small watershed of Moufengshan area in Guangzhou of China as study objects. In conclusion, gener-ally, the hydraulic conductivity is decreasing with an increase in profile depth. The variation ranges of hydraulic conductivity are 13. 64~4. 91,10. 4~3. 63, 8. 16~2. 96, and 7. 92~3. 71 m/d for phyllostachys pubescens, cyclobalanopsis chungii, bambu-sa multiplex var. nana, and eucalyptus forests respectively. The soil profiles are classified into upper and lower sub-layers after a combination of 20 ~40 cm and 40 ~60 cm layers due to small difference found in hydraulic conductivity. The result demon-strates that the coefficient of upper layer is 1. 89~2. 42 times of the lower layer. In general, coefficients of permeability are found to be positively related to porosity and root density, and negatively related to dry density, whilst the correlation with root diameter remains uncertain. However, the degrees of correlation with dry density, root density, and root diameter vary substantially for dif-ferent types of forest land, whereas an overall well correlation with porosity is presented.
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