| Summary: | 碩士 === 國立臺灣大學 === 植物學研究所 === 87 === The area of this research is in the First Farm of the National Taiwan University High Land Farm, which is located in Chun-yang Village, Jen-ai Hsiang, Nan-tou County. The altitude of the research area range from 1100m to 1900m, and has an average annual temperature of 18 degrees centigrade and precipitation of 2660mm that concentrates in the summer.
We have set up 54 plots within to investigate the types of woody species found, DBH, and the five environmental factors that are tested for each of the sample areas. We intend to use the data for DCA, and to categorize the plant communitiesin the entire research area into four vegetation types and two subtypes: I. Meliosma callicarpaefolia-Illicium arborescens forest type; II. Cinnamomum subavenium forest type; III. Machilus zuihoensis forest type; Ⅲa、Itea parviflora forest type；Ⅲb、Cinnamomum insulari-montanum - Pasania kawakamii forest type and IV. Gordonia axillaris forest type. The major environmental factor in this research area is the elevation.
The research area has been disturbed and damaged earlier, but since the National Taiwan University reclaimed this place, many efforts has been made in the protection of the forest. Hence most forests are in the mid-later stages of succession, and most compositions of all vegetation types have been able to go through self-regeneration. Although there are still old-trees left over from the earlier stages of succession, as long as no human disturbances persists, all vegetation types in this area except for the Gordonia axillaris forest type should be able to live on.
Due to agricultural and touring pressures, forests in nearby areas have mostly been depleted. In comparison, large parts of the natural resources in our research area have been restored and original vegetation were not lost. We hope to establish basic vegetation data for this research area for the benefit of future studies.
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