The soil physical property and water holding capacity of 30-year-old different densities of Pinus elliot-tii plantation in the source area of Ganjiang River were researched. Results indicated that soil bulk density incr-eases with the increase in soil depth for all the forests; the total soil porosities of P. elliottii plantation with di-fferent densities vary from 43.83% to 68.75%. The soil maximum average water- preserving capacity, average capillary preserving water capacity and average noncapillary-preserving water capacity of P. elliottii plantation with different densities from high to low were 2 500 plants/hm2(1 300.39, 909.10 and 392.29 t/hm2) >2 125 plants/hm2(1 226.16, 903.97 and 322.19 t/hm2) >2 000 plants/hm2(1 077.72, 795.07 and 282.66 t/hm2)>1 625 plants/hm2 (1 017.22, 811.38 and 205.84 t/hm2). The laws of profile and seasonal changes of soil water preserving capacity and time filed the exponential function Y=a·e-bx.%对赣江源不同密度30年生湿地松人工林土壤物理性质和持水性能进行了研究. 结果表明:不同密度湿地松林下土壤容重随土壤深度增加而变大,土壤孔隙度变化幅度为43.83%~68.75%. 不同密度林分类型的土壤平均最大持水量、平均毛管持水量和平均非毛管持水量相对大小依次为2 500株/hm2(1 300.39、909.10、392.29 t/hm2)>2 125株/hm2(1 226.16、903.97、322.19 t/hm2)>2 000 株/hm2(1 077.72、795.07、282.66 t/hm2)>1 625 株/hm2(1 017.22、811.38、205.84 t/hm2). 土壤持水量与时间的变化规律符合指数函数回归方程Y=a·e-bx.
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