黄菇娘光响应与CO_2响应曲线模型的比较

Comparative Study on Different Photosynthetic Light-response and CO_2 Response Models for Physalis pubescens L.

以黄菇娘为试材,采用直角双曲线修正模型、分段函数等5种模型对黄菇娘的光响应及CO2响应曲线进行拟合,研究相关光合参数的变化,比较其拟合效果。结果表明：5种模型中以直角双曲线修正模型、分段函数的拟合效果较好。直角双曲线与非直角双曲线2种模型的LSP、CSP远小于观测值,而Pmax和Amax也远大于观测值。二次多项式的光响应曲线预测值与实测值相对偏离较大,尤其在弱光区域（0～400μmol·m-2·s-1）,LCP为负值。

With Physalis pubescens L.as test materials,five models including modified rectangular hyperbola,subsection function etc.were used to describe photosynthesis-light response and CO2 response curves of Physalis pubescens L.respectively.Photosynthetic parameters from different models were compared,in order to compare fitting effect of different models.The results showed that,modified rectangular hyperbola and subsection function had better fitting effect than other models.The LSP and the CSP obtained from rectangular hyperbola or non-rectangular hyperbola were clearly underestimated,whereas Pmaxand Amaxobtained from these two models were overestimated.The prediction values of quadratic polynomial regressions were distinctly different from observed values,especially in the area of weak light（0-400μmol·m-2·s-1）.The light compensation point of quadratic polynomial regressions was unreasonable negative.