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作 者 ：陈德祥,李意德,骆土寿,陈步峰,林明献

期 刊 ：生态学报 2004年 24卷 8期 页码：1622~1628

关键词：CO2浓度倍增；光合特性；盘壳栎；热带山地雨林；海南岛；

Keywords:elevated CO_2, light response of photosynthesis, Castanopsis patelliformis, tropical mountain rain forest, Hainan island, Jianfengling,

摘 要 ：比较研究了海南岛尖峰岭热带山地雨林上层乔木盘壳栎 (Castanopsis patelliformis(Chun) Chun)叶片光合作用对高 CO2浓度的短期响应。用 L i- 6 4 0 0 (L i- cor,Inc.,USA)便携式光合作用测定系统外置 CO2 气源 ,程序控制 CO2 处理浓度为35 0μmol/ mol及其加倍浓度 ,测定叶片光合速率的日变化进程 ,并通过光合作用相关响应曲线计算主要光合参数。结果表明 ,CO2 浓度倍增可使盘壳栎植株阳性叶净光合速率平均提高 75 % ,光饱和光合速率提高 6 5 % ,气孔导度降低 2 8%～ 73% ,水分利用效率提高 4 3%～ 70 % ,光补偿点升高近 7μmol/ (m2· s) ,饱和点提高 10 0 μmol/ (m2·s) ,表观量子产量提高 6 1% ,反映出 CO2浓度升高可提高植物的光合生产力。叶片光合作用日变化趋势在高 CO2 浓度的短期作用下并未发生明显改变。

Abstract:The responses of tropical plants to CO_2 enrichment are interest in view of the global increase in CO_2 levels. In this research we measure and analyze the short-term responses of photosynthesis diurnal courses and photosynthetic light response in sun leaves of the canopy species Castanopsis patelliformis. The measurements were made with Li-6400 (Li-cor, Inc., USA) portable photosynthesis system, where CO_2 was controlled at ambient (350μmol/mol) and elevated (700μmol/mol) concentrations respectively, ...

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