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題名 | 南仁山森林四種臺灣特稀有樹種之光合作用光反應及溫度反應=Photosynthetic Light and Temperature Responses of 4 Rare and Endemic Tree Species in the Nanjenshan Forest, Taiwan |
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作者姓名(中文) | 郭耀綸; 陳瑄培; | 書刊名 | 臺灣林業科學 |
卷期 | 20:3 民94.09 |
頁次 | 頁215-226 |
分類號 | 436.12 |
關鍵詞 | 光合作用最適溫度; 希蘭灰木; 細葉茶梨; 小葉樟; 烏心石舅; Optimum temperature for photosynthesis; Anneslea lancolata; Cinnamomum brevipe-dunculatum; Magnolia kachirachirai; Symplocos shilanensis; |
語文 | 中文(Chinese) |
中文摘要 | 希蘭灰木、細葉茶梨、小葉樟及烏心石舅是臺灣特有且稀有樹種。本研究探討此4樹種在南仁山森林冬夏兩季的光點作用溫度及應及光反應,藉以了解各樹種的生理耐性範圍。光合作用溫度反應測定結果,此4樹種樹冠上層陽葉的光合作用最適溫度在夏季比下層陰葉高,但在冬季相反,比下層陰葉低。此4樹種光合作用最適溫度有明顯季節馴化能力。在冬季此4樹種陽葉的光合作用最適溫在22~25℃之間,由冬季到夏季,陽葉可提高5~6℃而陰葉只提高2~4℃。希蘭灰木無論在冬季或夏季,其光合作用最適溫均比其它三種低2~3℃,且生理適溫範圍也較另3樹種廣,顯示本樹種可生育在響?較低的環境。此4樹種光合作用最適溫雖有季節改變,但最適溫時的淨光合作用率在冬夏兩季並無顯著差異。夏季光反應測定結果,烏心石舅陽葉的光飽和光合作用率可達7.2μmol□□,其它3種在5.7~6.7μmol□□間,由此生理性狀判斷這4樹種均為耐陰樹種。本研究也發現此4樹種陽葉的光飽和光合作用率在冬夏兩季均無顯著差異,光合作用潛力對溫度的馴化明顯。 |
英文摘要 | Anneslea lancolata Kaneh, Cinnamoumum brevipedunculatum Chang, Magnonlia kachirachirai Dandy, and Symplocos shilanensis Liu & Lu are all rare and endemic tree species in Taiwan. In order to reveal their ability to physiologically adjust to temperature and light, the photosynthetic temperature responses and light responses of these species in the Nanjenhsan Forest were measured during the summer and winter. Results from the summer measurements showed that sunexposed leaves of the upper canopy had higher optimum temperatures for phtotynthesis (□) than did shaded leaves. In contrast, the opposite results were measured in winter. The □ in sunexposed leaves of the 4 species were between 22 and 25℃ in winter. In comparison to results from summer measurements, □ increased 5~6 and 2~3℃ for sun-exposed and shaded leaves, respectively, indicating significant seasonal acclimation abilities of all 4 species. The □ of S. shilanensis was 2~3℃ lower than that of the other 3 species in both seasons. Furthermore, S. shilanensis with a wider temperature range for optimum photosynthesis might have the ability to grow in cooler environments than the other 3 species. In addition, sun-exposed leaves of all 4 species had higher net photosynthetic rates at the optimum temperature (□) than did shaded leaves measured in the same season. However, no seasonal difference was found in □ either in sun-exposed or in shaded leaves of each species. The light-saturated photosynthetic rate (□) of sun-exposed leaves of M. kachirachirai in the summer was 7.2 μmol □□, and those of the other 3 species were only 5.7~6.7μmol □□. These low □ values for sun-exposed leaves of any of these species. All 4 species exhibited high degrees of temperature acclimation in terms of their photosynthetic capacity. |
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