Community and Population Dynamics of an Evergreen Conifer-Broadleaf Forest in Southern Taiwan: Recent Trends (1999~2009)

本研究針對一個位於台灣南部以台灣黃杉及長尾尖葉櫧為優勢的常綠針闊葉混合林，研究此森林在10年期間群集與主要優勢族群的動態變化。我們在1999年設立1公頃永久樣區，調查樣區內1 cm以上的樹木，給予標籤、物種鑑定及胸高直徑測量，並在2009年進行重新複查的工作。在10年期間，植物組成並沒有變化，Shannon歧異度指數僅稍有變化，根據對數模式來計算林分的死亡率、補充率、失去率及獲得率，分別為每年1.7、0.6、-0.5、0.02%。台灣黃杉的族群密度與優勢度呈現下降的趨勢，大部分優勢闊葉樹的族群密度呈現微幅下降趨勢，但是有8種優勢闊葉樹的優勢度呈現增加的趨勢。本研究結果顯示台灣黃杉在此永久樣區中競爭不過常綠闊葉樹。在2003年9月2日的強烈颱風是影響此常綠針闊葉混合林的群集及族群動態的主要因子。

關鍵字

常綠針闊葉混合林；群集動態；族群動態

並列摘要

Community and population dynamics in a 1-ha permanent plot of an evergreen forest of conifer and broadleaf trees, dominated by Pseudotsuga wilsoniana and Castanopsis carlesii, in southern Taiwan were studied. All live stems with a diameter at breast height of ≥ 1 cm in this area were identified by species, tagged, and measured, first in 1999 and then again in 2009. While no changes in the floristic composition occurred between 1999 and 2009, some slight variations were evident in Shannon's diversity index. Based on a logarithmic model, the mortality, recruitment, loss, and gain rates in basal area during this period were respectively calculated to be 1.7, 0.6, -0.5, and 0.02% yr^(-1). The stem density and especially the basal area (5.06 m^2 ha^(-1)) of P. wilsoniana, the most important conifer, decreased. Although the density of all dominant broadleaf trees slightly declined, 8 gained in basal area. Recent trends suggest that P. wilsoniana trees are now at a competitive disadvantage relative to evergreen broadleaf trees in the permanent plot, but a powerful typhoon on September 2, 2003, had a major impact on the community and population dynamics of this evergreen forest of conifer and broadleaf trees.

並列關鍵字

evergreen conifer-broadleaf forest ； community dynamics ； population dynamics

國際替代計量

Community and Population Dynamics of an Evergreen Conifer-Broadleaf Forest in Southern Taiwan: Recent Trends (1999~2009)

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