为了了解尾巨桉Eucalyptus urophylla×E.grandis和厚荚相思Acacia crassicarpa人工林的水源涵养功能,对相似立地条件下尾巨桉和厚荚相思人工林的林冠层、林下植被层、枯枝落叶层和林地土壤的贮水性能进行比较分析.结果表明,尾巨桉和厚荚相思人工林林分不同结构层次的持水量大小顺序均为土壤层(0～40 cm)＞枯枝落叶层＞林冠层＞林下植被层,厚荚相思人工林林冠层、枯枝落叶层和土壤层的持水量及渗透性能均高于巨尾桉,但林下植被层则呈相反趋势.尾巨桉和厚荚相思人工林的林分总持水量分别为1 852.82和1 917.72 t/hm2,林分单位面积水源涵养总价值分别为1 241.39和1 284.87元/hm2.%In order to investigate the water conservation effects of Eucalyptus urophylla x E. Grandis and Acacia crassicarpa plantations, plots with similar stand conditions were selected, and comparative studies were made on water-holding capacity of canopy, vegetation layer under canopy, litter layer and soil. Results showed that water-holding capacity in different layers of two different plantations were in the order of soil layer > litter layer > canopy > vegetation layer under canopy. The water-holding capacity of canopy, litter layer, and the water-holding capacity of soil were in the order of A. Crasscarpa plantation > E. Urophylla X E. Grandis plantations, but the water-holding capacity of layer under canopy was just the opposite. The total water-storage capacity both above ground and soil in E. Urophylla x E. Grandis and A. Crasscarpa plantation were 1 852. 82 and 1 917. 72 t/hm2 respectively, and the total value of water conservation for the two plantations were 1 241. 39 and 1 284. 87 yuan/hm2, respectively.
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