The hydrology-physics property of the soils in the pure and mixed forest of Phyllostachys edulis was studied. The results showed that： （ 1 ） the soil bulk density of pure forest and mixed forest was increased with the increase of soil depth. The soil bulk density of three layers in pure forest was higher than mixed forest. In the layer of 0 - 20 cm the soil total, capillary and non-capillary porosity of pure forest were higher, that in the layer of 20 - 40 cm were lower, and approximately in the layer of 40 - 60 cm. （2）The soil saturated moisture capacity, capillary water-holding capacity and noncapillary water- holding capacity in pure forest were distinctly higher than mixed forest in the layer of 0 - 20 cm, and lower than mixed forest in both layers 0 - 20 cm and 40 - 60 cm. （3） The permeability of both layers 0 -20 cm and 40 - 60 cm in pure forest was better than those in mixed forest, but the initial and stable permeation speed of layer 20 - 40 cm in pure is lower than mixed one. （4）Human＇s activities of pure forest management have some influence on the hydrology-physics properties of the surface soil.%比较研究了井冈山自然保护区毛竹纯林及竹杉混交林的土壤水文-物理性质。结果表明：（1）毛竹纯林与毛竹混交林土壤容重随土壤深度的增加而增大,纯林各层土壤容重比混交林大。竹毛纯林0~20 cm土层非毛管孔隙、毛管孔隙、总孔隙度均比混交林要大;20~40 cm土层,纯林的土壤容重比混交林要小;40~60cm土层,纯林与混交林的孔隙状况相近;（2）纯林0~20 cm土层其最大持水量、毛管持持水量、非毛管持水量均高于混交林该层土壤,而20~40 cm、40~60 cm 2层次土壤的3个指标都小于混交林;（3）0~20 cm和40~60 cm土层,毛竹纯林土壤渗透性优于毛竹混交林,但20~40 cm层次土壤,纯林土壤渗透性较混交林低;（4）纯林经营中的一些人为活动对林内表层土的土壤水文-物理性质产生了一定影响。
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