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- Composition, Structure, and Preliminary Restoration Efforts of a Tropical Coastal Forest at Siangjiaowan, Southern Taiwan
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題 名 | Composition, Structure, and Preliminary Restoration Efforts of a Tropical Coastal Forest at Siangjiaowan, Southern Taiwan=香蕉灣熱帶海岸林森林組成結構及初步復育工作 |
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作 者 | 郭耀綸; 王相華; 彭世賢; 楊雅萍; | 書刊名 | 臺灣林業科學 |
卷 期 | 29:4 2014.12[民103.12] |
頁 次 | 頁267-284 |
分類號 | 436.12 |
關鍵詞 | 棋盤腳; 徑級結構; 生態復育; 入侵陽性樹種; 物種豐量; Barringtonia asiatica; Diameter structure; Ecological restoration; Invasive shade-intolerant species; Species abundance; |
語 文 | 英文(English) |
中文摘要 | 香蕉灣生態保護區的熱帶海岸林,近年來因人類開路造成邊際效應,林緣環境惡化,陽性樹種及銀合歡入侵嚴重。此外,許多珍貴樹種缺乏更新植株,林分組成結構與過40年比較已有很大的改變。本研究於2012年1月,在該處設置長300 m,寬40~60 m,面積1.55 ha的調查樣區,將樣區內所有木本植物予以編號,記錄種類、高度、胸徑(≥1 cm者),並標記其空間分布位置。2012年植群普查共記錄到58種胸徑≥ 1 cm的樹種,共計1765株ha^(-1),以紅柴及血桐的株數最多。胸徑<1 cm的木本植物有53種,共3023株ha^(-1),以紅柴934株最多。胸徑≥ 1 cm的58種樹種中,大多數樹種的徑級結構為波動型,蓮葉桐及棋盤腳族群即屬此型,顯示此處過去常遭擾動。此區樹種的重要值指數排序,棋盤腳與蓮葉桐分別為第1及第3位,但是陽性樹種血桐及蟲屎分別已達第2及第6位,且血桐與銀合歡會佔據颱風擾動所形成的孔隙。由1974到2012年,蓮葉桐及棋盤腳的物種豐量分別減少31及21%,月橘及檄樹分別減少51及55%,而血桐及蟲屎則分別增加56倍及4倍。在2012年8月有2個颱風侵襲南台灣,此海岸林葉面積指數由3.96降至1.73,但颱風過後75天已回升至3.02,林冠枝葉生長恢復甚快。2012年7月起在此處進行初步生態復育工作,已減少3種入侵陽性樹種在風災擾動區的密度,並人為栽植棋盤腳及其他海岸林原有樹種,期望能改善此海岸林的林分結構。 |
英文摘要 | In recent years, the tropical coastal forest of the Siangjiaowan Ecological Reserve has been severely invaded by shade-intolerant species and "Leucaena leucocephala" due to road construction which created adverse edge effects along the forest. In addition, many valuable tree species lack new recruits. The composition and structure of this forest are dramatically altered compared to those 40 yr ago. To understand the current status of this coastal forest, we established a 1.55-ha sampling plot (300 m long, 40~60 m wide) in the forest in January 2012. Each individual of a woody species was identified and tagged, and its height, diameter at breast height (DBH), and location were recorded. In total, 1765 trees ha^(-1) belonging to 58 species with a DBH of ≥1 cm were recorded; among them, "Aglaia formosana and Macaranga" tanarius had the highest species abundances. For trees with a DBH of <1 cm, a total of 3023 stems ha^(-1) belonging to 53 woody species was recorded, with 934 stems belonging to "Agl. formosana". Among the 58 species with individuals with a DBH of ≥1 cm, e.g., "Hernandia nymphiifolia and Barringtonia asiatica", most of them appeared to have a fluctuating diameter structure, indicating that many disturbance events had occurred during their regeneration process. Sorted by the Importance Value Index (IVI) of this stand, "Bar. asiatica" and "Her. nymphiifolia" were listed as nos. 1 and 3. However, "Mac. tanarius" and "Melanolepis multiglandulosa", both very shade-intolerant species, were nos. 2 and 6 in the IVI. Furthermore, "Mac. tanarius" and "Leu. leucocephala" rapidly occupy tree-fall gaps created by disturbances from typhoons. From 1974 to 2012, species abundances of "Her. nymphiifolia" and "Bar. asiatica" were respectively reduced by 31 and 21%, and those of "Murraya paniculata" and "Morinda citrifolia" were reduced 51 and 55%, while those of "Mac. tanarius" and "Mel. multiglandulosa" increased 56- and-4 fold. The leaf area index of this tropical forest decreased from 3.96 to 1.73 after 2 typhoons hit in August 2012, but had rebounded to 3.02 in only 75 d after the second typhoon. Preliminary ecological restoration efforts of this forest were initiated in July 2012. We reduced the density of 3 invasive shade-intolerant species in a wind-disturbed site and planted "Bar. asiatica" and other native species of this coastal forest, in an effort to improve the stand structure of this tropical coastal forest. |
本系統中英文摘要資訊取自各篇刊載內容。