TITLE	Long-term ecological research in the Yuanyang Lake forest ecosystem I. Vegetation composition and analysis4
AUTHOR	Chang-Hung Chou Institute of Botany, Academia Sinica, Taipei, Taiwan 115, ROC Tze-Ying Chen Ilan Institute of Technology, Ilan, Taiwan, ROC Chi-Cheng Liao Institute of Botany, Academia Sinica, Taipei, Taiwan 115, ROC Ching-I Peng Institute of Botany, Academia Sinica, Taipei, Taiwan 115, ROC
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ABSTRACT	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 1,650-2,432 m altitude. The total area of the natural preserve is about 374 ha, of which the lake occupies about 3.6 ha and the marshy area encircling the lake about 2.2 ha. 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, Sparganium fallax 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.
KEYWORD	Chamaecyparis; Community formation; Florisitc analysis; Miscanthus transmorrisonesis; Potamogeton octandrus; Rhododendron mariseii; Sparganium fallex; Successional trend; Yuanyang Lake;
ARTICLE INFO	Botanical Bulletin of Academia Sinica, Volume 41 Number 1 January 2000, page 61-72, 12 pages
PUBLISHER	Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China