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題 名 | 恆春半島熱帶海岸林之植群結構與組成=Vegetation Structure and Species Composition of Tropical Coast Forest in Hengchun Peninsula, Southern Taiwan |
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作 者 | 王相華; 田玉娟; 李玟樑; | 書刊名 | 國家公園學報 |
卷 期 | 21:1 2011.03[民100.03] |
頁 次 | 頁23-34 |
分類號 | 436.12 |
關鍵詞 | 熱帶海岸林; 老熟林; 次生林; 銀合歡; 入侵植物; Tropical coastal forest; Old-growth forest; Secondary forest; Leucaena leucocephala; Invasive species; |
語 文 | 中文(Chinese) |
中文摘要 | 恆春地區除香蕉灣一帶尚有小面積殘存之老熟熱帶海岸林外,其餘多為人為擾動後之次生海岸林,且銀合歡入侵情形嚴重。本研究於恆春半島西側及南側熱帶海岸林內設置45個面積為20m×4m的植被樣區,調查海岸林之植群結構及樹種組成現況,目的在探討:1. 次生與老熟熱帶海岸林在結構與組成上的差異性;2. 銀合歡入侵強度對熱帶次生海岸林結構與組成的影響;3. 次生海岸林在生態保育上所扮演的角色。相較於香蕉灣老熟海岸林,次生海岸林的植株密度較高、胸高斷面積較低,即次生林內密佈許多中、小徑級的林木,但缺乏大徑木;此外,次生林內鮮少有棋盤腳、蓮葉桐等老熟海岸林內具代表性的大型優勢喬木。銀合歡入侵明顯影響林分的結構與組成,排擠海岸林老熟林樹種的生存空間,並有可能會影響演替的進程。此外,銀合歡在西海岸次生林的入侵情形明顯較南海岸嚴重。目前次生海岸林之林木覆蓋尚佳,除入侵種銀合歡外,不乏有生長快速之海岸林偏陽性的原生樹種,亦保有少量海岸老熟林常見的演替中、後期樹種,除具有水土保持及生物多樣性維護之功能外,亦可適度提供植生復育所需的材料來源。 |
英文摘要 | The old-growth tropical coast forest in Hengchun Peninsula of south-ern Taiwan is now only conserved in Banana Bay with an area of approximately 28 ha, and most of the coastal area is covered by secondary forest that is seriously invaded by alien tree species, Leucaena leucocephala. Along the west and south side of the coastal area, 45 coast forest plots with an area of 20m x 4m had been set up for structure and species composition investigation. The aims of this study were to clarify: 1. The struc-tural and compositional difference between secondary and old-growth tropical coast forest; 2. The influence of alien tree invasion on the secondary forest structure and composition; and 3. The value of secondary forest to tropical coast forest conservation. Compared with old-growth forest, secondary forest was higher in tree density and lower in basal area. Therefore, secondary forest was densely covered by many small trees, but showed no dominance by big trees such as Hernandia nymphiifolia and Barringtonia asiatica as in old-growth forest. The structure and composition of tropical coastal forest were obviously influenced by L. leucocephala invasion, which could possibly change the secondary forest succession pathway. The western coastal forest was invaded more seriously by L. leucocephala than the southern coastal secondary forest. Nevertheless, secondary coast forest is now still well covered by canopy, fast-growth native pioneer tree species as well as some old-growth coast forest tree species. Results from this study demonstrate that secondary coastal forest conserves diversity of native trees, which could be an important source for tropical coastal forest revegetation. |
本系統中英文摘要資訊取自各篇刊載內容。