| Summary: | 碩士 === 國立中興大學 === 森林學研究所 === 84 === Chatienshan Nature Reserve is the larger one lying in the north part of the Taiwan. The reserve covers an area of 7,759.17 ha, with elevationsranging from 300 to 2,130 meters. It''''''''s climate belongs to the wet subtropicto cool-temperature type. The objective of this study is to perform aninventory of plant species and vegetation analysis. In the vascular plantinventory, there are 148 families, 413 genera, 749 species, among which 22species are rare. Plant communities are analyzed with 115 samples and 9environmental factors. According to the correspondence in the polar ordination (PO) axis and the environmental factors, the most dominant environmental factor affected on the differentiating of vegetation is the altitude gradient In the matrixcluster analysis (MCA), vegetation types have been recognized as follows：(Ⅰ)Villebrunea pedunculata type, (Ⅱ)Schima superba－Machilusjaponica type, (Ⅲ)Turpinia formosana type, (Ⅳ-A)Castanopsiscarlesii subtype, (Ⅳ-B)Calocedrus formosana－Turpinia formosana subtype, (Ⅳ-C)Machilus kusanoi subtype, (Ⅳ-D)Cinnamomum micranthum－Helicia formosana subtype, (Ⅳ-E)Litsea acuminata subtype,(Ⅴ)Eurya glaberrima type, (Ⅵ)Sycopsis formosana type, (Ⅶ-A)Chamaecyparis formosensis subtype, (Ⅶ-B)Cyclobalanopsis sessilifolia subtype, (Ⅶ-C)Fagus hayatae－Neolitsea acuminatissima subtype,(Ⅶ-D)Cyclobalanopsis morii subtype, (Ⅶ-E)Rhododendron formosanumsubtype, and (Ⅶ-F)Chamaecyparis obtusa var. formosana subtype. Moreover, the vegetation types can be classified as Quercus zoneand Machilus-Castanopsis zone based upon the results of the MCA, POand interspecies association, which are the most representative in the northeastinland climate type region, as show in the assessment. The vegetation successionof Quercus zone and Machilus-Castanopsis zone can be inferredby the degree of disturbance and the population of local predominants. Inthis reserve, the abundance in the species is indicated by most evennessindices above 0.7, it belongs to a later stage of succession. And speciesdiversity is decreased with along the rising elevation. Fagus hayatae,the focus of conservation, due to poor fruiting itself, too many dominant forest floor plants, and the powerful competition of broad-leavestrees etc. have poor natural regeneration ability, and tends toward drcrease in population.
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