中国农业气象

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CO_2浓度升高对茶树光合速率影响的初步研究

杨书运,张庆国,李伟,王凤文   

  1. 安徽农业大学,安徽农业大学,安徽农业大学,安徽农业大学 合肥230036 ,合肥230036 ,合肥230036 ,合肥230036
  • 出版日期:2005-04-10 发布日期:2005-04-10
  • 基金资助:
    国家自然科学基金项目 (70 2 710 6 2 ) ;; 农业部茶叶生物技术重点开放实验室开放基金项目

Effect of CO_2 Concentration Increasing on the Photosynthetic Rate of Camellia sinensis

YANG Shu-yun,ZHANG Qing-guo,LI Wei,WANG Feng-wen (Anhui Agriculture University. Hefei 230036, China)   

  • Online:2005-04-10 Published:2005-04-10

摘要: 通过人工调控CO2 浓度,对不同光环境下茶树(Camelliasinensis)的光合速率进行了研究。在气温34 0℃以上、光合有效辐射强度80 0 μmol/ (m2 s)左右的高温、强光环境中,提高大气CO2 浓度可缓解高温对光合速率的抑制作用,CO2 浓度提高到5 5 0 μl/l可使抑制茶树光合作用的气温提高约1~2℃,70 0 μl/l则可使抑制气温提高3~4℃。在强光下CO2 对茶树有较强的“气肥”作用,在光合有效辐射强度为4 0 0 μmol/ (m2 s)左右的弱光环境中CO2浓度提高也可提高光合速率水平。弱光环境中气温对光合作用的影响较强,茶树最适宜生长温度为2 9 0~30 0℃,气温超过30 0℃则温度开始对光合作用产生抑制,在气温达34 0℃以上高温时,茶树表现为净呼吸

关键词: 茶树, 光合速率, CO2浓度

Abstract: The photosynthetic rate under different CO_2 concentration condition was measured during the growth stage of Camellia sinensis from March to July in 2004. The results showed that: when the temperature was above 34.0℃ and PAR reached about 800μmol m~(-2)s~(-1), the decreasing speed of photosynthetic rate due to high temperature became slow by enhancing the atmospheric CO_2 concentration. And the inhibited temperature enhances approximately 1~2℃ or 3~4℃ when the CO_2 concentration was 550ppm or 700ppm. Under a weak light (the PAR was below 400μmol m~(-2)s~(-1)) condition, although increasing CO_2 concentration could improve the photosynthesis rate, the effect of air temperature on the photosynthesis rate was more obvious. At this light condition, the most suitable temperature was 29.0~30.0℃, the photosynthesis rate would weaken even stop if the temperature exceed 30.0℃ or 34.0℃.

Key words: Camellia sinensis, Camellia sinensis, Photosynthetic rate, CO_2 concentration