碩士 / 國立臺灣大學 / 生態學與演化生物學研究所 / 93 / Mt. Ma-Hai-Pu-Fu-Shih is located on the western side of the Central Mountain Range in central Taiwan. With the exception of an area of reforestation in the south-western region, all the other areas are made up of natural primary forests. This study of vegetation analysis focuses on the Quercus Forest of Mt. Ma-Hai-Pu-Fu-Shih. I set up 48 20m x 20m plots located at an elevation of 1800-2600 m above sea level. Within each plot, all free-standing woody plants with dbh≧1cm were identified and measured. In total of 124 species, 38 families and 71 genera are represented in the plots. Of these, the most speciose family was Fagaceae followed by Pinaceae. In terms of Important Value, the most dominant species were Cyclobalanopsis morii, followed by Tsuga chinensis var. formosana, Chamaecyparis formosensis, Picea morrisonicola and Castanopsis carlesii.
Using the TWANSPAN for the initial stage of vegetation classification, a total of 8 vegetation types were defined. Among them two are considered to be the successional forest types. Leaving out the plots of successional forest type, the remaining 40 plots were divided into 9 different forest types using Cluster Analysis. Consequently, 11 vegetation types were derived with the combination of the above two methods, and are designated as follow: Alnus formosana forest type, Pinus taiwanensis forest type, Meliosma callicarpaefolia forest type, Castanopsis carlesii forest type, Rhododendron formosanum forest type, Chamaecyparis obtusa var. formosana forest type, Machilus japonica forest type, Chamaecyparis formosensis forest type, Cyclobalanopsis morii forest type, Picea morrisonicola forest type and Tsuga chinensis var. formosana forest type.
DCA results revealed that elevation and topography were the major environmental factors affecting forest types. Each vegetation type exhibited different structure, species composition and species diversity.
To understand the regeneration of each vegetation type, size-class distribution analyses were constructed and only species with more than 20 stems and the dominant species were included. Size-class distribution showed a clear inverse J-shape pattern for most species in the forest types ( including Meliosma callicarpaefolia forest type, Castanopsis carlesii forest type, Chamaecyparis obtusa var. formosana forest type, Machilus japonica forest type and Cyclobalanopsis morii forest type ) suggesting a good regeneration potential. However, dominant species of the Pinus taiwanensis, Rhododendron formosanum and Tsuga chinensis var. formosana forest types displayed a unimodal size-class distribution with highest stem densities in the 5-10 cm size class and with low level of recruitment. Dominant species in the Alnus formosana, Chamaecyparis formosensis and Picea morrisonicola forest types exhibit a negatively skewed unimodal distribution. These species are thought to be shade-intolerant, requiring large-scale disturbance in order to regenerate.
| Identifer | oai:union.ndltd.org:TW/093NTU05110005 |
| Date | January 2005 |
| Creators | Pao-Yuan Chen, 陳保元 |
| Contributors | 謝長富 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 97 |
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