- 期刊
臺灣赤楊與山鹽菁對擾動地主要環境應力之反應
Responses of Formosan Alder and Roxburgh Sumac to Main Environmental Stresses of Disturbed Land
摘要
本研究選取擾動地優勢樹種臺灣赤楊與山鹽菁為供試植物，針對其在擾動地環境應力之適應性反應進行試驗，文中特別就乾旱馴化後之生理生態反應進行探討。結果顯示，山鹽菁經乾旱馴化處理後光飽和點有增加之現象，而臺灣赤楊則否。二供試植物經乾旱馴化後其光合成最適溫度升高。在低溫時臺灣赤楊之相對淨光合成率較高，顯示臺灣赤楊較適於低溫下生長。在斷水處理過程中，臺灣赤楊的氣孔反應較山鹽菁敏感，但經乾早馴化後兩種植物氣孔反應均較緩慢，顯示其有耐旱性增加之情形。而葉綠素螢光值之反應（Fv／Fm）結果亦顯示，旱馴化處理與否，其反應性差異甚大。另臺灣赤楊之根部經拉拔位移26天後，葉片淨光合成率恢復至原來的76.6～86.8%，而山鹽菁恢復至71.4～82.1%，顯示臺灣赤楊對土體擾動後植物活力之恢復能力較山鹽菁強。
並列摘要
Two pioneer tree species of disturbed land, Formosan alder and Roxburgh Sumac, were chosen to test their eco-physiological responses to environmental stresses, especially to long term drought stress. After drought acclimation, the light saturation point of Roxburgh Sumac was increased while Formosan alder was not, but the optimum photosynthetic temperature was increased for two species. In low leaf temperature, the relative net photosynthetic rate of Formosan alder was higher than that of Roxburgh Sumac, that implied the former was more adaptable growing at low temperature. The stomatal responses of Formosan alder was more sensitive than that of Roxburgh Sumac during the process of water withholding. The leaf stomatal response of drought acclimated individual of two species was less sensitive than that of non-stress individuals, that showed the abilities of drought resistance got increased. The leaf chlorophyll fluorescence responses of long-term drought stress were differ from non-stress individuals. Besides, on the root pulling out testing, the photosynthetic recovery capacity of Formosan alder is better than Roxburgh Sumac, that showed Formosan alder was more suitable to live at disturbed land.
延伸閱讀
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