杉木幼林生态系统凋落物及其分解作用研究

THE LITTER AND ITS DECOMPOSITION IN YOUNG CHINESE FIR PLANTATION ECOSYSTEM

在尤溪人工林生态站内，对杉木幼林生态系统凋落物数量、组成、动态、养分归还量及分解作用的定位研究结果表明：杉木幼林生态系统年均凋落量为１．０６ｔｈｍ－２，杉木凋落物各组分占总量的比例表现为：叶＞枝＞杂物＞花果，其中枝叶占杉木幼林凋落物的９３．４０％。杉木幼林凋落物凋落节律表现为双峰型，两个凋落高峰分别为３月和１２月。每年通过凋落回归林地的Ｎ、Ｐ、Ｋ分别为８．５０ｋｇｈｍ－２、０．６８ｋｇｈｍ－２、６．５２ｋｇｈｍ－２，不同处理凋落物的分解速率表现为：埋置处理＞地表淋溶处理＞地表无淋溶处理，地下埋置及降水淋溶能促进凋落物的分解。

This paper deals with the production,component,seasonal pattern,returning nutrient element and decomposition of litter in young Chinese fir plantation ecosystem.The results are as follows:The mean annual litter in young Chinese fir plantation was 106 t·hm-2.The litter amount of different organs of Chinese fir plantation were in the sequence of leaf>branch>miscellany>flower and fruit,of which the leaf and branch accounted for 9340% of annual total litter fall.The seasonal pattern of littering exhibited two peaks,which were in March and December,respectively.The annual amount of N,P,K in litter returning to soil were 85,068,652 kg·hm-2,respectively.The decomposition rates of litter in different conditions were in the sequence of underground sample>leaching sample on the soil above ground>inleaching sample on the soil surface.It indicates that underground and leaching can promote the decomposition of litter.