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。
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℃.
出处
《中国农业气象》
CSCD
2005年第2期90-94,共5页
Chinese Journal of Agrometeorology
基金
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
