文峪河支流3种不同河岸林凋落物现存量研究

Litter Amount of Different Riparian Forest Types in the Upstream of Wenyu River

笔者以关帝山文峪河上游支流河岸华北落叶松纯林、云杉纯林和落叶松云杉混交林的凋落物为研究对象,采用野外定点观测、样品采集、定点试验和实验室分析结合的方法,对不同类型河岸林各类凋落物现存量进行研究,了解华北落叶松纯林、云杉纯林和落叶松云杉混交林3种不同类型河岸林森林凋落量及组成成分,并对整个群落的凋落物分解状况进行分析。结果表明:不同林分凋落物现存量以及森林凋落物现存量的不同组分数量具有不同的变化规律。落叶松纯林的各类凋落物现存量以及凋落物总量最多,其次是落叶松云杉混交林,云杉纯林凋落物现存量最少,而落叶组分的量在3种不同林分类型中都占绝对优势;落叶松纯林的碎屑层平均厚度为5.7cm,云杉纯林为5.1cm,落叶松云杉混交林为6.3cm,混交林>落叶松纯林>云杉纯林。不同类型森林的凋落物现存量、不同季节凋落物现存量、不同树种组成凋落物现存量、不同生境下凋落物现存量均存在明显差异。

Based on the riparian forest in the anabranch of Wenyu river＇s upstream,the standing stock of litters in three different types of riparian forest（pureL.principis-rupprechti forest,purespruce forest and mixed forest of principis-rupprechti with spruce）had been identified.The method which combined field investigation,sample collection,fixed position test with laboratory analysis was employed to study the extant amount and composition of the litter in the different riparian forest and the decomposition condition of standing stock of litters in forestry community was analyzed.The results showed that the extant amount of litter in different types of forest,and the different components of standing stock of litters showed various patterns.The pureL.principis-rupprechti forest had most standing stock of litters,followed by the mixed forest,and the pure spruce forest had the litters.The amount of defoliation occupied the absolute superiority in three different types of forest.The bioclast as a main composition made up the humus layer,and the average thickness of the bioclast layer was 5.7 cm in pureL.principis-rupprechti forest,5.1 cm in purespruce forest,and 6.3 cm in the mixed forest.Sorting the forest stands by thickness of the bioclast layer from greatest to least,was the mixed forest,the pure L.principis-rupprechti forest,and the pure spruce forest.There also showed significant difference among the standing stock of litters in different types of forest,in different seasons,in different tree species and different habitats.