贡嘎山暗针叶林枯落物截留特征研究

 采用现场模拟法和浸泡法观测贡嘎山不同演替阶段的暗针叶林群落枯落物截留、枯枝落叶层的最大持水量和林内枯落物的截留特征。结果表明:不同林型的枯落物截留量与林外降雨量有不同程度的线性相关关系,而与林内降雨量存在幂函数关系。同林型内,由于枯落物数量、组成成分与分解程度等不同,其持水能力也存在着较大的差异。过熟林中枯落物吸水饱和时间最短,最大持水率最低,枯落物与林下苔藓层混杂在一起,截留水分的能力相对较弱;幼龄林中枯落物饱和需要时间最长,最大持水率也最高,对林下降雨的再分配作用也相应最大。同时,枯落物层的截留作用及截留量的大小,除与枯枝落叶层的数量和质量相关外,也与枯落物的湿润程度相关。

Litters interception capability of dark coniferous in Gongga Mountain

In this paper more attentions are paid to the litters in different forest types and precipitation features, thus litters interception have been observed by the simulation method in site in different types of dark coniferous forest communities at four successive stages. And the max absorption intensity of litters in different forest types had been observed by immersion in water. Results show that rainfall of litter interception in different forest types is linearly correlated to rainfall outside of stands. There is typical power function relation between litter interception and throughfall. The water holding ability of litters has relation to amount and composition of litters, while its decomposition degree is positively related to stand age. And the litter interception capability is influenced by original wetness degree of ground cover.