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Syntaxonomic and Gradient Analysis of Keteleeria davidiana var. formosana Forests in Taiwan
台灣油杉森林的統整分類與梯度分析
摘要
本研究使用65個台灣油杉的森林樣區進行植群多變數分析，樣區的資料部份是來自相關的文獻，部分是來自作者新調查的樣區與未發表的樣區，僅使用木本的維管束植物進行分析。使用雙向指標種分析法及列表比較法進行林型的統整分類，並使用降趨對應分析法來了解樣區在植相空間上的分布。共劃分出1個群團、2個群叢、4個亞群叢，分別是台灣油杉群團、灰背櫟－台灣油杉群叢、山紅柿－台灣油杉群叢、疏花紫珠亞群叢、南仁五月茶亞群叢、琉球松亞群叢、紅花八角亞群叢。本文經詳細比對，將文獻中的植群型異名納入本研究的分類單位。降趨對應梯度分析的結果顯示台灣油杉森林的植群在南北兩地有明顯的分化，且南部及北部的台灣油杉森林亦各自有分化的情形。
並列摘要
In this study we present a comprehensive multivariate analysis of Keteleeria davidiana var. formosana forest vegetation in Taiwan. In total, 65 sample plots were compiled, partly from the relevant literature and partly from new and unpublished data. We used only woody vascular plant species for the analysis. The syntaxonomy of forest types was determined by a 2-way indicator species analysis (TWINSPAN) and tabular comparison method. A detrended correspondence analysis (DCA) was applied to the ordination analysis to clarify floristic variations of the 65 sample plots. One alliance, 2 associations, and 4 subassociations were distinguished and described: the K. davidiana var. formosana alliance was recognized and divided into Cyclobalanopsis hypophaea-Keteleeria davidiana var. formosana association including the Callicarpa remotiflora and Antidesma hiiranense subassociations and a Diospyros morrisiana-Keteleeria davidiana var. formosana association including the Pinus luchuensis and Illicium arborescens subassociations. Synonyms in the recent literature on forests relating to these associations and subassociations are given. The ordination program confirmed the differentiation of K. davidiana var. formosana forests.