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題 名 | 南仁山迎風與背風分布樹種之光合作用對溫度的差異反應=Differential Responses of Photosynthesis to Temperature between Tree Species of Nanjenshan Forests Inhabiting in Windward and Leeward Sites |
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作 者 | 陳志遠; 郭耀綸; | 書刊名 | 作物、環境與生物資訊 |
卷 期 | 5:2 2008.06[民97.06] |
頁 次 | 頁93-102 |
分類號 | 436.251 |
關鍵詞 | 季風; 光合作用最適溫度; 光合作用; 生育地分化; 溫度; Monsoon; Optimum temperature for photosynthesis; Photosynthesis; Site differentiation; Temperature; |
語 文 | 中文(Chinese) |
中文摘要 | 臺灣南端的南仁山區,迎風坡與背風坡森林的樹種組成及植物形相差異極大,其原因尚未能瞭解,很可能是該處每年10月至翌年3月半年間盛行東北季風的強風機械傷害,或因吹風造成的低溫,使該處迎風、背風生育地的植物發生生育地分化。為檢驗兩處樹種是否因生理上對溫度適應幅度有所差異,致生育環境產生分化的假說,本研究於2003年夏季、2004年及2005年冬季,測定南仁山迎風與背風森林共19種林木,樹冠層上層葉的光合作用對溫度反應,計算各樹種光合作用最適溫度(T□)。結果發現9種迎風樹種及10種背風樹種在夏季平均的T□分別為29.7及29.2℃,2004年冬季分別為21.5及20.3℃,2005年則分別為23.2及23.7℃,顯示分布在兩處生育地的樹種在夏季或冬季時的T□均無顯著差異。然而比較冬季低溫期間,各樹種光合作用率由T□降至15℃時的光合作用降低程度,發現背風樹種下降的斜率較迎風樹種大,顯示背風樹種光合作用機制易受低溫抑制,迎風樹種則較能忍受低溫。南仁山迎風與背風生育地樹種,無論在夏季或冬季,兩類樹種的光合作用最適溫度並無明顯分化,因此不支持本研究有關低溫造成樹種生育地分化的假說。然而兩處森林樹種耐低溫的能力不同,此可能是兩類樹種適應環境的結果,而不是產生生育地分化的原因。 |
英文摘要 | Species compositions at windward and leeward sites of Nanjenshan, Kenting National Park, are significantly different. Although the reason for this difference is not yet certain, it is probably due to the differential impacts of wind stress caused by the northeasterly monsoon, which occurred from mid October to early March; or that low temperature caused by the chilling effects of monsoon might have triggered habitat differentiation in species inhabiting windward and leeward sites. To Prove and verify our hypothesis, physiological activities of the upper canopy leaves from 19 plant species were examined in summer of 2003, winter of 2004, and winter of 2005. In summer of 2003, the average optimum temperature for photosynthesis (T□) of 9 windward and 10 leeward species were 29.7°C and 29.2°C, respectively; in winter of 2004, they were 21.5°C and 20.3°C; and in winter of 2005, they were 23.2°C and 23.7°C. The average values of T□ were not significantly different between the windward and leeward species. However, comparing the degree of decline in photosynthesis from T□ to 15°C of each species during winter season, the declining slope of leeward species was found significantly higher than the windward species. Thus, photosynthesis of leeward species was more likely to be inhibited by low temperature, while windward species could tolerate low temperature conditions. Conclusively, there was no significant different in T□ between windward and leeward species, and hence the hypothesis of habitat differentiation due to low temperature is not supported. However, windward and leeward species did show different ability to endure low temperature. It might be the consequence of adaptation to environment, and not the cause for habitat differentiation between tree species of the two groups. |
本系統中英文摘要資訊取自各篇刊載內容。