https://scholars.lib.ntu.edu.tw/handle/123456789/137755
標題: | Photosynthesis Related Characteristics of Upper and Lower Canopy Leaves of Kandelia obovata, a Mangrove Species in Taiwan 水筆仔樹?上、下層?光合作用相關特徵比較 |
作者: | 高文媛 | 關鍵字: | Mangroves;Kandelia obovata;Photosynthesis;Chlorophyll fluorescence;紅樹?;水筆仔;光合作用;??素螢光 | 公開日期: | 九月-2006 | 卷: | 51 | 期: | 3 | 起(迄)頁: | 181-187 | 來源出版物: | Taiwania | 摘要: | To understand the light use properties of canopy leaves in K. obovata, the dominant mangrove species in the west coast of northern Taiwan, I compared photosynthesis related characters, such as leaf angles, leaf area, stomatal density, specific leaf area, and chlorophyll fluorescence, of upper and lower canopy leaves of the species. Leaves that had developed in exposed positions (upper canopy) exhibited significantly steeper leaf angles, smaller leaf area, higher stomatal density and lower specific leaf area than those in shaded positions (lower canopy). No significant difference was found in chlorophyll (Chl) content per unit leaf area and Chl a/b ratio between the two types of leaves. In contrast, compared to lower canopy leaves, upper canopy leaves had higher nitrogen content per unit leaf area indicating a higher light saturated CO2 assimilation. Chlorophyll fluorescence measurement revealed that photosaturated electron transport rate (ETR) and the photon flux required to saturate ETR were significantly higher in upper canopy leaves than in lower canopy leaves. The plasticity in morphological and physiological response to variation in light regimes may represent an important mechanism for K. obovata to adapt to the saline and nitrogen limiting environment. 水筆仔是?台灣西岸主要紅樹?樹種。水筆仔樹?的上層?和下層?可能因為接受到的光??同,導致其在形態和生?反應上有所調整。本文比較該樹?上、下層?的?面角?、?面積大小、氣孔密?、單位重?面積、??素螢光等與光合作用相關特徵,以?解水筆仔樹?對光使用特性。結果發現上、下層?在形態上有顯著差?:上層??面角?較大、面積較小、氣孔密?較高以及單位重?面積較小。雖然?者單位面積??素含?和??素a/b 比沒有顯著差?,但上層?單位面積有顯著較高的氮含?。??素螢光測?顯示:相較於下層?,上層?其電子傳遞鏈速?在較高光?下才會達到飽和且有顯著較高的光飽和值。這些特徵差?顯示水筆仔為因應?同光環境,在?形態和生?上有所調整。 |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/283498 http://ntur.lib.ntu.edu.tw/bitstream/246246/283498/1/5103_200609_4.pdf |
顯示於: | 生命科學系 |
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