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題 名 | 光度及溫度變化對四種樟科植物之光合成氣體交換之影響=Photosynthetic Gas Exchange Responses of Four Laurel Plants to Light Intensity and Leaf Temperature |
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作 者 | 劉坤樹; 林信輝; | 書刊名 | 水土保持學報 |
卷 期 | 29:4 1997.12[民86.12] |
頁 次 | 頁387-397 |
分類號 | 373.141 |
關鍵詞 | 淨光合成率; 用水效率; 最適溫度; Photosynthetic rate; Leaf conductance; Leaf temperature; Light intensity; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究配合福山森林生態系闊葉樹種光合成與蒸散作用之試驗研究,採取台灣雅 楠、大葉楠、香楠及紅楠等四種樟科植物為植物材料,於同化箱內進行光合成氣體交換性對 不同光度及溫度之反應性試驗。 試驗結果,盆栽植物之葉片光合作用與葉片導度,均於 10 時至 16 時之間呈穩定狀態,淨光合成率、蒸散率及用水效率均隨光度增高而增大,其中香 楠具較高之光補償點與較大之暗呼吸率, 臺灣雅楠、大葉楠及香楠之光合成最適溫度為 30 ℃,紅楠之光合成最適溫度為 35 ℃左右,四種供試植物最大蒸散率出現於 35 ℃,略高於光 合成最適溫度,其中香楠對高溫 (40 ℃ ) 之忍受力較其它樹種低。四種植物之用水效率均 隨溫度之增加而降低。由於植物栽植之方法以及測試時間、環境條件等均會影響葉片之生理狀 態,本研究以盆栽植物為材料,其試驗所得之絕對值應異於野外或群落生長狀態,但種間之反 應性差異應可作為參考。 |
英文摘要 | This study was to determine the photosynthetic gas exchange response of four dominant trees of Laurel family in the Fu-shan forest ecosystem. Leaf photosynthetic rate, leaf transpiration rate, Ci/Ca value, and water-use efficiency of potted seedlings were measured in an assimilation chamber under various controlled light intensity an dleaf temperature. The results indicate that Incense Nanmu has the highest light compensation point and highest dark respiration rate. The optimum temperature for photosynthesis was 30 ℃ for Taiwan Phoebe, Large-leaved Nanmu, and Incense Nanmu, while the temperatures optimum for Red Nanmu was 35 ℃. Taiwan Phoebe was more tolerant of low temperatures. and Incense Nanmu was less tolerant of high temperature(40 ℃ ). The water-use efficiency of all 4 species decreased with increases in temperature. The mesured datum is influented by the growing condition and measured time...etc. Therefore] the results should be different to that measured in the field. However, they could be used for comparing relative reference of the respeonses of different species. |
本系統中英文摘要資訊取自各篇刊載內容。