九份二山地區岩生植群與樹種萌蘗更新之研究

Studies on Rock Vegetation and Trees Sprout Regeneration in Joe-fen-er-shan Area

余建勳(Chien-Hsun Yu)

指導教授 ： 郭城孟

國立臺灣大學/生命科學院/生態學與演化生物學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.00515

摘要

岩石環境為一種特殊的生育地形式，而目前對於這一類生育地的植群相關研究仍非常有限。位於南投縣國姓鄉境內的九份二山地區，由於其特殊的地質地形構造，因此具有相當豐富的岩石生育環境，為了解當地岩生環境之植群組成，以及岩生植群與其他生育地植群之差異性，筆者在該地區設立了46個樣區進行調查，結果共分出六個主要的植群型，分別為山黃麻－筆筒樹林型、山香圓－大葉楠林型、烏皮茶－黃杞林型、火燒柯－小西氏石櫟林型、頷垂豆－香楠林型以及粗糠柴－青岡櫟林型，而其中的粗糠柴－青剛櫟林型為最具代表性之岩生植群，其植物組成與其他林型有著很大的差異，顯示出岩生植群具有高度之特殊性。
岩石環境對植物而言是一種逆境，要在此生長並不容易，為了解岩生樹種之適應機制，筆者進一步去調查這些樹種的適應方式，結果發現在含石率越高的生育地中，樹種發生萌蘗的機率也就越高，顯示出萌蘗可能為一種有利於適應岩生環境的重要方式，此外調查結果中亦發現，岩生植群中具有相當多的落葉性樹種，推測落葉同樣也是適應岩生環境的一種方式。

關鍵字

萌蘗 ； 逆境 ； 岩生植群 ； 植群分析 ； 植群研究 ； 九份二山 ； 落葉性

並列摘要

Rocky environment is a special habitat form; however, vegetation studies in rocky habitat are few. Joe-fen-er-shan area, which has a special rocky geological structure, is located right in Guoshing township in Nantou County. In this research, 46 plots were set for investigating rock vegetation association. Six vegetation types were classified from the data. They are Trema orientalis－Sphaeropteris lepifera type、Turpinia formosana－Machilus japonica type、Pyrenaria shinkoensis－Engelhardtia roxburghiana type、Castanopsis hystrix－Pasania konishii type、Archidendron lucidum－Machilus zuihoensis type and Mallotus philippensis－Cyclobalanopsis glauca type. Among these types, Mallotus philippensis－Cyclobalanopsis glauca type is the most typical rock vegetation type and its vegetation composition is very different from others. This suggests that rock vegetation is very unique.
Rocky habitat is a stress for plants, and most of the plants have difficulties in growing there. To understand the mechanism of the rock vegetation, I investigated how trees adapt to this kind of stress. The result shows that the more rock content it has, the more tree sprouts there will be in the habitats. As a result, I infer that sprouting is an important adaptation for plants growing in rock environment. In addition, I also discover that there are many deciduous trees in rocky vegetation which indicates that defoliation is an adaptation for rock environment, too.

並列關鍵字

Stress ； Rock vegetation ； Vegetation analysis ； Vegetation study ； Joe-fen-er-shan ； Sprouting ； Deciduous

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