天然桦杨次生林引入油松对枯落物持水能力的影响

Effect of Pinus Tabulaeformis Introduced Into Natural Poplar Secondary Forest on Water Holding Capacity of Litter

为探究张家口庞家堡林场天然桦杨次生林引入油松对枯落物持水能力的影响,采用室内浸泡法,选择混交林、白桦纯林、油松纯林3种典型林分进行枯落物持水能力研究。结果表明:(1)枯落物蓄积量排序为混交林(10.45 t/hm^(2))>油松纯林(4.66 t/hm^(2))>白桦纯林(3.75 t/hm^(2))。(2)枯落物持水量与浸泡时间呈对数函数关系,枯落物吸水速率与浸水时间呈幂函数关系。(3)枯落物最大持水量和有效拦蓄量排序均为混交林(35.22 t/hm^(2),23.55 t/hm^(2))>白桦纯林(15.64 t/hm^(2),10.50 t/hm^(2))>油松纯林(13.73 t/hm^(2),23.55 t/hm^(2)),半分解层持水能力强于未分解层。综合表明,引针入阔形成的混交林枯落物层的持水能力强于纯林。

In order to investigate the effects of Chinese pine on the water-holding capacity of litter introduced into natural Betula poplar secondary forest in Zhangjiakou Forest Farm,three typical stands of mixed forest,white birch pure forest and Chinese pine pure forest were selected by indoor soaking method.The results showed as follows:①The order of litter accumulation:mixed forest(10.45 t/hm^(2))>pure Chinese pine forest(4.66 t/hm^(2))>pure birch forest(3.75 t/hm^(2)).②The relationship between water retention and soaking time is logarithmic function,and the relationship between water absorption rate and soaking time is power function.③The order of maximum water retention and effective storage of litter:mixed forest(35.22 t/hm^(2),23.55 t/hm^(2))>pure birch forest(15.64 t/hm^(2),10.50 t/hm^(2))>pure pine forest(13.73 t/hm^(2),23.55 t/hm^(2)).The water holding capacity of the semi-decomposed layer is stronger than that of the undecomposed layer.The results showed that the water holding capacity of litter layer in mixed forest was stronger than that in pure forest.