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題 名 | Photosynthetic Responses and Acclimation to Temperature in Seven Conifers Grown from Low to High Elevations in Subtropical Taiwan=原生於亞熱帶臺灣從低至高海拔的七種針葉樹之光合作用對溫度之反應及馴化 |
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作 者 | 翁仁憲; 廖天賜; | 書刊名 | 臺灣林業科學 |
卷 期 | 25:2 2010.06[民99.06] |
頁 次 | 頁117-127 |
分類號 | 436.11 |
關鍵詞 | 海拔; 針葉樹; 光合作用; 溫度; Elevation; Conifer; Photosynthesis; Temperature; |
語 文 | 英文(English) |
中文摘要 | 由於針葉樹大多分布於低溫地區,對分布於高溫地區者較少研究。為提供地球暖化因應之基本資料,本研究以7種分布於台灣不同海拔之針葉樹為對象,探討其光合作用對其生長溫度及測定溫度之反應。結果顯示,當幼苗培養於高溫環境(30/23℃, 日/夜)下,會減少測定時的高溫對其光合作用之抑制,使光合適溫(T(下標 opt))升高。分布於低及高海拔之針葉樹種,當生長於低溫(20/10℃)時,其T(下標 opt)分別為20~23及16~21℃,而生長於高溫時則分別為23~27及21℃。當同一物種分別培養於高溫及低溫環境下,其T(下標 opt)之差異,三種(竹柏、大葉羅漢松、台灣肖楠)分布於低海拔(< 1000~1900 m)及一種分布於廣海拔(台灣二葉松,750~3000 m)者為2.2~7.7℃,而兩種(紅檜、台灣扁柏)分布於高海拔(1000~2900 m)者為-0.7~2.3℃。此外,有一分布於高海拔樹種(鐵杉,2000~3500 m)當培養於低溫環境下,及另一廣海拔分布樹種(台灣二葉松)當培養於高溫環境下時,均可在較廣泛圍之溫度下(各為18~34及8~24℃)維持高光合速率(≥最大值之90%)。由以上結果可知,就如常綠闊葉樹,原生於亞熱帶台灣不同海拔之針葉樹種,其光合作用能藉基因分化及對溫度之馴化來適應其棲地的溫度。而且分布於低海拔及廣海拔者,當生長溫度上升時,其T(下標 opt)之熱馴化潛力通常較高。 |
英文摘要 | Since most conifer species are commonly distributed in low-temperature regions, information of the photosynthetic response to temperature of conifers growing in high-temperature regions is little known. In order to obtain information on the photosynthetic response of conifers to global warming, the photosynthetic responses of 7 conifers grown from low to high elevations in subtropical Taiwan to both growth and measurement temperatures were studied. The results indicated that plants, except Chamaecyparis obtusa var. formosana, grown at high temperatures (30/23℃, day/night), exhibited lower inhibition of the light-saturated photosynthetic rate (P(subscript N)) at high temperature and an increase in the optimum temperature for photosynthesis (T(subscript opt)). The T(subscript opt) values of conifers with low-and high-elevational distributions grown at low temperatures (20/10℃) were 20~23 and 16~21℃, respectively; and T(subscript opt) values of these conifers grown at high temperatures were 23~27 and 21℃, respectively. Differences in T(subscript opt) values for 3 conifers (Nageia nagi, Podocarpus macro-phyllus, and Calocedrus macrolepis var. formosana) with low-elevation (<1000~1900 m) distributions, and 1 conifer (Pinus taiwanensis) with a broad-elevational (750~3000 m) distribution with low-and high-temperature acclimation were 2.2~7.7℃; those for 2 conifers with high-elevational distributions (Cha. formosensis and Cha. obtusa var. formosana, 1000~2900 m) were -0.7~2.3℃. In addition, 1 species with a high-elevational distribution (Tsuga chinensis var. formosana, 2000~3500 m) grown at low temperatures, and 1 species (P. taiwanensis) with a broad elevational distribution grown at high-temperatures both maintained relatively high P(subscript N) values (≥ 90% of the maximum) at wide temperature ranges (8~24 and 18~34℃, respectively). From the above results it was concluded that, just like broadleaf evergreen trees, the photosynthesis of conifer plants distributed at low and high elevations in Taiwan adapts to the temperature of their habitat through both genetic variations and thermal acclimation. Conifers with low-and broad-elevational distributions generally exhibited a higher potentiality for thermal acclimation of the T(subscript opt) when growth temperatures shifted from low to high. |
本系統中英文摘要資訊取自各篇刊載內容。