台大實驗林神木溪保護林闊葉林及竹林枯落物動態研究

Litterfall Dynamics in Natural Hardwood Forest and Its Adjacent Bamboo Plantation in Shenmuhsi Forest Reserve of the Experimental Forest, National Taiwan University

鹿兒陽(Erh-Yang Lu) ； 朱珮綺(Pei-Chi Chu) ； 沈介文(Chieh-Wen Shen) ； 彭靖媛(Jing-Yuan Peng)

《國立臺灣大學生物資源暨農學院實驗林研究報告》 19卷2期 (2005/06) Pp. 147-160

https://doi.org/10.6542/EFNTU.200506_19(2).0005

摘要

本研究以南投縣信義鄉台大實驗林神木溪保護林中相鄰之天然闊葉林與石竹林為調查對象，自2002年6月至2004年5月，每月收集一次枯落物，為期兩年共收集24次。結果顯示天然闊葉林第一、二年之年枯落量分別為9,893、14,331kg ha^(-1)，第二年的枯落物大幅提升，主要是因為收集到較大量的枝條、樹皮與繁殖體；石竹林第一、二年之年枯落量分別為8,757、7,840 kg ha^(-1)，兩年相差較小。枯落物組成中，天然闊葉林以落葉為最主要組成，枝條與樹皮次之，石竹林同樣也是以落葉最多，竹鞘次之。天然闊葉林第一、二年的枯落物高峰分別在7月及9月，均是因為颱風的侵襲而將大量的枝條打落所致；石竹林第1、2年的枯落物高峰則分別在7月及5月，主要是因為新葉發生，老葉大量枯落所致。
在森林地表總乾重方面，天然闊葉林的森林地表乾重量14,341kg ha^(-1)，高於石竹林的7,666 kg ha^(-1)，主要是因為天然闊葉林有較多的枝條，不過葉部組成則是以石竹林較多。若以各組成所佔年枯落量及枝葉層量之比例來比較推測枯落物的分解速率，兩林分枯落物各組成之分解速率均以葉部的分解較快，枝條部份分解較慢。

關鍵字

神木溪保護林 ； 闊葉林 ； 竹林 ； 枯落物 ； 森林地表

並列摘要

This study compared the litterfall dynamics between natural hardwood forest and its adjacent Thill bamboo (Phyllostachys lithophila) plantation in the Experimental Forest of National Taiwan University. The litterfall was collected once a month for 24 months (June, 2002~May, 2004). The results showed that annual litterfall was 9,893 and 14,331 kg ha^(-1) in natural hardwood forest in the first and second years, respectively, and 8,757 and 7,840 kg ha^(-1) in the bamboo plantation. In. hardwood forest, the higher amount of litterfall in the second year was largely attributed to the greater amount of fallen branches, bark, and reproductive organs. In both natural hardwood forest and bamboo plantation the most important component was leaf-fall for both years. The litterfall of natural hardwood forest peaked in July and September in the first and second years, respectively, when branches were blown off by strong wind and heavy rain. In contrast, the litterfall of bamboo plantation peaked in July and May in the first and second years, respectively, when new leaves replaced senescent leaves.
The dry weight of the forest floor in natural hardwood forest (14,341 kg ha^(-1)) was greater than that in ”P. lithophila” plantation (7,666 kg ha^(-1)) because natural hardwood forest accumulated more fallen branches, The comparisons between the annual litterfall and forest floor suggested that fallen leaves decomposed faster than did fallen branches in both stands.

並列關鍵字

Shenmuhsi Forest Reserve ； hardwood forest ； bamboo plantation ； litterfall ； forest floor