花生不同光合-CO2响应曲线拟合模型的比较  

Different Fitting Models of Photosynthesis-CO2 Response Curves of Peanut: Comparison

作　　者：李思嘉 陈志德[2] 王晓婧 杨长琴[2] 张国伟[2] 刘瑞显 Li Sijia;Chen Zhide;Wang Xiaojing;Yang Changqin;Zhang Guowei;Liu Ruixian(College of Bioscience and Biotechnology,Yangzhou University,Yangzhou Jiangsu 225009;Institute of Industrial Crops,Jiangsu Academy of Agricultural Sciences,Nanjing 210014)

机构地区：[1]扬州大学生物科学与技术学院,江苏扬州225009 [2]江苏省农业科学院经济作物研究所,南京210014

出　　处：《中国农学通报》2020年第12期33-38,共6页Chinese Agricultural Science Bulletin

基　　金：国家花生产业技术体系“南京综合试验站”(CARS-13);江苏省农业科学院“小而特”学科建设专项资金项目(项目编号ZX(18)2014)。

摘　　要：为选择合适的数学模型来拟合花生(Arachis hypogaea L.)光合-CO2响应曲线,比较了直角双曲线模型、Michaelis-Menten模型、非直角双曲线模型、指数函数、直角双曲线修正模型以及指数改进模型在模拟2个花生品种‘JS702’和‘JS713’的光合-CO2响应曲线中的拟合度。结果表明,6种典型的CO2响应模型均可对花生叶片的光合-CO2响应曲线进行模拟,决定系数均达0.95以上。由计算的响应参数可知,不同模型拟合的2个品种的最大净光合速率均比实测值高,对于‘JS702’品种以指数改进模型计算最大净光合速率值最为接近实测值,而‘JS713’品种以直角双曲线修正模型、非直角双曲线模型和指数改进模型计算的最大净光合速率最为接近实测值。由直角双曲线修正模型与指数改进模型求解的饱和CO2浓度与实测值差异较小,其余模型均与实测值差异较大。6个模型拟合的CO2补偿点差异相对较小,‘JS702’品种的CO2补偿点以直角双曲线修正模型、指数模型和指数改进模型与实测值最为一致;而‘JS713’品种的CO2补偿点以直角双曲线修正模型与实测值最为一致。不同模型拟合的光呼吸速率2个品种均表现出以直角双曲线修正模型和指数改进模型较为接近实测值。综合分析,直角双曲线修正模型和指数改进模型比较适合用于拟合花生的光合-CO2响应曲线。To select an appropriate model to fit the photosynthesis-CO2 response curve of peanut, six typical models(rectangular hyperbolic model, Michaelis-Menten model, non-rectangular hyperbolic model,exponential model, modified rectangular hyperbolic model, and modified exponential model) were adopted to fit the photosynthesis-CO2 response curves of two peanut(Arachis hypogaea L.) varieties(‘JS702’and‘JS713’).Results showed that all the six models could fit the photosynthesis-CO2 response curves of the two peanut varieties(R2>0.95). All the six models overestimated the maximum net photosynthetic rate(Pnmax), while the modified exponential model presented more realistic value for‘JS702’, the non-rectangular hyperbolic model,the modified rectangular hyperbolic model and the modified exponential model presented more realistic values for‘JS713’. The values of CO2 saturation point(Cisat) estimated by modified rectangular hyperbolic model and modified exponential model had small difference with the measured data, however, the Cisatestimated by other four models were significantly different from the measured data. The estimated values of the CO2 compensation point(Γ) by the six models were all close to the measured values, Γ calculated by modified rectangular hyperbolic mode, exponential model and modified exponential model were most consistent with the measured data for‘JS702’, Γ calculated by modified rectangular hyperbolic model was more close to the measured data for‘JS713’. The estimated values of the rate of photorespiration(Rp) by modified rectangular hyperbolic model and modified exponential model were close to the measured values for the two peanut varieties. All data suggested that the modified rectangular hyperbolic model and modified exponential model could well fit the photosynthesis-CO2 response curve for peanut to study the photosynthetic characteristics.

关 键 词：花生 CO2响应曲线 模型 最大净光合速率 饱和CO2浓度 

分 类 号：S565.2[农业科学—作物学]