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选取元谋干热河谷3种植被恢复典型人工纯林(印楝、新银合欢、桉树),通过对林下枯落物蓄积量的实地调查和室内持水过程试验,测定枯落物的持水能力和持水过程。结果表明:1)3种林分单位面积枯落物蓄积量由大到小依次为:新银合欢(5.751t/hm2)>桉树(3.328t/hm2)>印楝(2.041t/hm2)。2)3种林分枯落物持水能力存在显著差异。最大持水量、蓄水量、最大拦蓄量和有效拦蓄量大小依次为新银合欢>桉树>印楝;自然持水量、自然持水率和最大持水率大小依次为印楝>新银合欢>桉树。3)将3种林分枯落物持水过程分析得出:枯落物持水量和吸水速率分别与浸水时间呈显著的对数关系和幂函数关系,枯落物在1h内持水量和吸水速率迅速增加,随着时间的延长,吸水速率逐渐下降,24h后基本达到饱和。
Three typical artificial pure forests (Neem, Nephelium, Eucalyptus) of restoration of vegetation in Yuanmou dry and hot valley were selected. Through the field investigation of litter volume and indoor water holding test, the water holding capacity of litter Ability and water holding process. The results showed as follows: 1) The stock volume of litter per unit area in the three stands was as follows: New Acacia (5.751t / hm2)> Eucalyptus (3.328t / hm2)> Neem (2.041t / hm2). 2) There are significant differences in water holding capacity among the three stands. The maximum water holding capacity, water storage capacity, maximum storage capacity and effective storage capacity were as follows: New Acacia> Eucalyptus> Neem; natural water retention, natural water retention and maximum water retention were as follows: eucalyptus. 3) Analyzing the water holding process of the three kinds of stand litter, the results showed that the water holding capacity and water absorption rate of litter were significantly logarithmic and power function relationship with the immersion time respectively. Water content and water absorption The rate increased rapidly, with the extension of time, the water absorption rate decreased gradually, basically reached saturation after 24h.