植物光合作用模型参数的温度依存性研究进展

Temperature dependence of parameters of plant photosynthesis models:A review

综述了植物光合作用与温度响应模型研究的进展,围绕光合作用生化模型的4个主要参数:胞间CO2浓度、RuBP最大碳同化速率(V c max)的活化能、RuBP最大再生速率(J max)的活化能和J max/V c max,讨论了影响光合作用-温度响应曲线的内在机理.随着生长温度的升高,所有物种的V c max活化能均呈增加趋势,而其他参数的变化因物种不同而存在明显差异,说明V c max的活化能可能是决定光合作用温度依存性的首要参数.最后分析了研究中存在的问题并提出研究展望,认为应整合叶片与群落水平的光合作用模型,从叶面积、太阳辐射、冠层结构、冠层小气候和光合能力等方面研究植物群落对全球变化的响应机理.这对于人们理解和准确估算植物生长、群落碳收支和生态系统初级生产力具有重要意义.

This paper reviewed the progress on the temperature response models of plant photosyn- thesis. Mechanisms involved in changes in the photosynthesis-temperature curve were discussed based on four parameters, intercellular CO2 concentration, activation energy of the maximum rate of RuBP （ribulose-1,5-bisphosphate） carboxylation （Vc max） , activation energy of the rate of RuBP re- generation （Jmax） , and the ratio of Jmax to Vc . All species increased the activation energy of Vc max with increasing growth temperature, while other parameters changed but differed among species, suggesting the activation energy of Vc m= might be the most important parameter for the temperature response of plant photosynthesis. In addition, research problems and prospects were proposed. It＇ s necessary to combine the photosynthesis models at foliage and community levels, and to investigate the mechanism of plants in response to global change from aspects of leaf area, solar radiation, ca- nopy structure, canopy microclimate and photosynthetic capacity. It would benefit the understanding and quantitative assessment of plant growth, carbon balance of communities and primary productivity of ecosystems.