碩士 / 國立臺灣師範大學 / 生命科學研究所 / 101 / Biodiversity, forest structure and leaf area index (LAI) are important parameters in forest ecological research. Forest ecologists are interested in understanding changes in these parameters along latitudinal and altitudinal gradients. Early altitudinal studies were conducted in tropical regions (ex. Central and South America) or biodiversity hotspots (ex. Costa Rica) in 1970, and most studies reported a general decreasing trend in biodiversity, biomass accumulation, canopy height, and LAI along the altitudinal gradient. There are very few altitudinal studies in Taiwan, I investigated undisturbed forests in the central Taiwan to examine the patterns of biodiversity, canopy height, biomass, and LAI along the altitudinal gradient. All stem > 1cm and higher than 1.3m in plots were identified to species and diameter at breast height (DBH), and tree height were measured. Biodiversity is presented as species richness. Further, we utilized two equations to biomass estimate. We also collect information of important weather parameters including mean monthly precipitation, annual mean temperature, evapotranspiration and typhoon disturbance to explore their role on controlling the altitudinal pattern of forest structure. The results indicate that biodiversity decreased with increases in altitude and may be influenced by temperature. Biomass and tree height both decreases along the altitudinal gradient. Water availability (increases with elevation) and typhoon disturbance (decreases with elevation) probably contributed to the decreasing trend. LAI showed a “hump-shape” along the altitudinal gradient. Previous research infers that this tendency might be related to occasional drought at low altitude in winter and low temperature at highest altitude. However, statistical result is unable to suppose this inference. We propose that typhoon disturbance may also be important in causing low LAI value at lower elevations in addition to its effects on biomass and tree height.
| Identifer | oai:union.ndltd.org:TW/101NTNU5112008 |
| Date | January 2013 |
| Creators | Chung-Hao Chi, 祁中浩 |
| Contributors | Teng-Chiu Lin, 林登秋 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 64 |
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