【摘要】 对马占相思人工林3个不同年龄阶段(4,7 a和11 a)的林冠层、林下植被层、枯枝落叶层、林地土壤持水量和渗透性能以及它们随林分年龄的变化规律进行了比较分析。研究结果表明,林分地上部分持水量的大小顺序为11 a生(52.86 t/hm2)>7 a生(41.90 t/hm2)>4 a生(25.78 t/hm2),其趋势是随林龄的增大而增加,林地土壤(0~40 cm)持水量和渗透性能也有相同的变化趋势;4,7 a和11 a林分的总持水量即地上部分与林地土壤的持水总量分别为2 048.8,2 200.3,2 313.3 t/hm2,林分水源涵养总价值分别为1 372.70,1 474.42元/hm2和1 549.91元/hm2。因此,马占相思人工林对改善土壤结构、提高水源涵养功能都有良好的作用。更多还原

【Abstract】 The water-holding capacity of canopy,vegetation layer under canopy and litter layer,the water-holding capacity and permeability of soil as well as their changes with growth of stands in Acacia mangium plantations of 3 different age classes(4-year-old,7-year-old and 11-year-old)were further studies.The result shows that total water-holding above ground in the order of 11-yearstand age(52.86 t/hm~2)>7-year-stand age(41.90 t/hm~2)>7-year-stand age(25.78 t/hm~2),the increment tendency increased with stand age.Similar sequence also obtained on the water-holding capacity and permeation capacity of soil(0~40 cm).The total water-storage capacity both above ground and soil in 4-year-old and 7-year-old and 11-year-old of Acacia mangium plantations were 2 048.2 t/hm~2,2 200.3 t/hm~2 and 2 313.3 t/hm~2,respectively,and the all value of water conservation were 1 372.70,1 474.42 yuan/hm~2 and 1 549.91 yuan/hm~2 yespectively.Therefore,Acacia mangium plantation had a good ability to modifying soil structure and good water conservation function.更多还原