[中国太行山南麓栓皮栎和刺槐光合 - CO₂响应模拟]
[Simulation on photosynthetic-CO response of Quercus variabilis and Robinia pseudoacacia in the southern foot of the Taihang Mountain, China].
作者信息
Ren Bo, Li Jun, Tong Xiao Juan, Mu Yan Mei, Meng Ping, Zhang Jin Song
机构信息
College of Forestry, Beijing Forestry University, Beijing 100083, China.
Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
出版信息
Ying Yong Sheng Tai Xue Bao. 2018 Jan;29(1):1-10. doi: 10.13287/j.1001-9332.201801.003.
In this study, leaf photosynthetic CO-response curves of Quercus variabilis and Robinia pseudoacacia were measured using a Li-6400XT photosynthetic measurement system in the southern foot of the Taihang Mountain, China. The rectangular hyperbola model (RH), nonrectangular hyperbola model (NRH) andYe model (YZP) were used to fit photosynthetic-CO response curves and compare photosynthetic parameters, including the maximum net photosynthetic rate (A), the initial carboxylation rate (η), light respiration rate (R), CO compensation point (CCP) and CO saturation point (CSP). Compared with the NRH and YZP models, A, η, R and CCP obtained by the RH model were higher, and were 59.8%, 128.6%, 133.4% and 19.8% higher than the measured values. The accuracy of the RH model was lower and its relative error was higher than that of the NRH and YZP models.Compared with the RH and YZP models, A fitted by the NRH model was higher, and was 11.1% higher than the measured value. η, R and CCP fitted by the NRH model were closer to the measured values. CO saturation phenomenon of photosynthesis could be simulated by the YZP model, and A and CSP were fitted well. A, R and CCP in the shaded leaves of Q. variabilis were 31.3%, 5.2% and 14.3% lower than those in the sunlit leaves. A, R and CCP in shaded leaves of R. pseudoacacia were 23.5%, 11.0% and 5.4% more than those in the sunlit leaves. η in the shaded leaves of Q. variabilis and R. pseudoacacia were 6.9% and 7.0% higher than those in the sunlit leaves, respectively. R and CCP of R. pseudoacacia leaves had linear relationships with temperature (T) and photosynthetic active radiation (PAR), and η had a significant relationship with stomatal conductance (g). η of Q. variabilis leaves was linearly correlated with PAR and g, and CCP was affected by T and relative humidity. A of Q. variabilis leaves had significant positive linear relationships with RH and g.
在本研究中，利用Li-6400XT光合测量系统，在中国太行山南麓测定了栓皮栎和刺槐的叶片光合CO响应曲线。采用直角双曲线模型（RH）、非直角双曲线模型（NRH）和叶模型（YZP）对光合-CO响应曲线进行拟合，并比较光合参数，包括最大净光合速率（A）、初始羧化速率（η）、光呼吸速率（R）、CO补偿点（CCP）和CO饱和点（CSP）。与NRH和YZP模型相比，RH模型得到的A、η、R和CCP更高，分别比测量值高59.8%、128.6%、133.4%和19.8%。RH模型的精度较低，其相对误差高于NRH和YZP模型。与RH和YZP模型相比，NRH模型拟合的A更高，比测量值高11.1%。NRH模型拟合的η、R和CCP更接近测量值。YZP模型可模拟光合作用的CO饱和现象，A和CSP拟合良好。栓皮栎遮荫叶片的A、R和CCP分别比阳生叶片低31.3%、5.2%和14.3%。刺槐遮荫叶片的A、R和CCP分别比阳生叶片高23.5%、11.0%和5.4%。栓皮栎和刺槐遮荫叶片的η分别比阳生叶片高6.9%和7.0%。刺槐叶片的R和CCP与温度（T）和光合有效辐射（PAR）呈线性关系，η与气孔导度（g）呈显著关系。栓皮栎叶片的η与PAR和g呈线性相关，CCP受T和相对湿度影响。栓皮栎叶片的A与RH和g呈显著正线性关系。
Zotero 插件