Long-term Ecological Research in the Yuanyang Lake Forest Ecosystem I.Vegetation Composition and Analysis

鴛鴦湖森林生態系長期生態研究I.植被組成及分析

周昌弘(Chang-Hung Chou) ； 陳子英(Tze-Ying Chen) ； 廖啟政(Chi-Cheng Liao) ； 彭鏡毅(Ching-I Peng)

《Botanical Bulletin of Academia Sinica》 41卷1期 (2000/01) Pp. 61-72

https://doi.org/10.7016/BBAS.200001.0061

摘要

鸳鸯湖自然保留區位於台彎東北部新竹縣及桃圓縣境交界，其集水區係源自大漢溪之上游，高度自1，650公尺。自然保留區面積共374公頃，全胡包括沼澤區面積共約3.6公頃，但湖面僅2.2公頃。此自然保留區蘊育著豐富的珍稀植物，其植物相共185種維管束植物，分屬71科，115屬；蕨類植物14科，23屬，33種；裸子植物3科，3屬，4種；雙子葉植物46科，70屬，108種；單子葉植物8科，19屬，22種。出現種類較多之科有蕨類的水龍科7種，薔薇科9種，冬青科8種，杜鵑花科10種，均屬溫帶樹種。然而，在溫帶較優勢的榖斗科與樟科植物在本區內極為罕見，只出現7種。以優勢度（包括相對密度及覆蓋度），雙向列表分析法及降趨對應分析本區之植被，再配合環境因子而歸納出六型植物即：(一)森林植物社會，包括：第一型：台彎扁柏型(Chamaecyparis obtusa var. formosensis),第二型：柳杉人工型(Cryptomeria japonica plantation type);(二)水、溼生草本植物社會，包括：第三型：高山芒型(Miscanthus transmorrisonesis type),及第四型：眼子菜型(Potamogeton octandrus type),第五型：東亞黑三稜型:(Sparganium fallax type)及第六型：水毛花型(Schoenoplectus mucronatus type)。此六型植物以扁柏林為主要優勢種，并有自然更新的机能，吾等認為其植物消長已近末期而呈現現一個穩定的植物社會。

關鍵字

扁柏 ； 群系 ； 植被分析 ； 高山芒 ； 眼子菜 ； 守城滿山紅 ； 東亞黑三稜 ； 演替 ； 鴛鴦湖

並列摘要

The Yuanyang Lake Nature Preserve is located in the northeastern part of Hsinchu County, Taiwan. It is the uppermost head water of the Tahan River watershed at 1,650-2, 432m altitude. The total area of the natural preserve is about 374ha, of which the lake occupies about 3.6ha and the marshy area encircling the lake about 2.2ha. The surrounding hillsides are dominated by cypress forests. Floristic analyses by means of Two-Way Indicator Species Analysis (TWINSPAN) and Detrend Correspondence Analysis (DCA) were conducted at the site. The findings of the former analysis concluded that the forest could be divided into two communities, namely a coniferous-hardwood community, and a swamp or early succession community. The former comprises (a) Chamaecyparis formosensis, C. obtusa var. formosana, Tsuga chinesis and (b) Rhododendron mariseii-Rhamus cranata. The swamp or early succession community comprises (a) Potamogeton octandrus, Sparganiumfallax and Schaenoplectus mucronatus, (b) Miscanthus transmorrisonesis and Schoenoplectus morrisonensis. In total, there are 185 species of vascular plants, in 115 genera and 71 families. The cypress community has reached its stable stage, and Chamaecyparis species are capable of self regeneration. A successional trend of vegetation in the nature preserve area was proposed; however, the mechanism of the successional trend on the aquatic communities needs further investigation.

並列關鍵字

Chamaecyparis ； Community formation ； Florisitc analysis ； Miscanthus transmorrisonesis ； Potamogeton octandrus ； Rhododendron mariseii ； Sparganiumfallex ； Successional trend ； Yuanyang Lake