亚热带10种蕨类植物光响应模型拟合及光合特性研究

通过合适的光响应模型来准确计算植物光合参数是研究植物光合特性的重要手段。为深入了解亚热带蕨类植物的光合特性，采用直角双曲线模型、非直角双曲线模型、指数模型和直角双曲线修正模型等4种常用光响应模型分别对10种亚热带蕨类植物进行光响应曲线拟合。通过分析决定系数(R~2)、均方根误差(RMSE)、平均绝对误差(MAE)、光饱和点(LSP)、光补偿点(LCP)、最大净光合速率(P_nmax)、暗呼吸速率(R_d)和表观量子效率(AQE)等9种参数，探讨亚热带蕨类植物的光响应模型拟合效果及其光合特性。结果表明：直角双曲线修正模型和非直角双曲线模型对本研究10种亚热带蕨类植物的拟合效果较好，其中直角双曲线修正模型的LSP拟合效果最好，非直角双曲线模型的拟合精度最高。光合参数的聚类分析和TOPSIS(Technique for Order Preference by Similarity to an Ideal Solution)综合评价法表明，10种亚热带蕨类植物的光合特性既具有相似性又存在物种特异性。黑鳞耳蕨(Polystichum makinoi(Tag...

Light response model fitting and photosynthetic characteristics of ten different fern species in subtropics

Accurate calculation of photosynthetic parameters by appropriate light response model is an important means to study photosynthetic characteristics of plants. In order to understand the photosynthetic characteristics of fern species in subtropical region, four light response models, namely rectangular hyperbola model, non-rectangular hyperbolic model, exponential model, and modified rectangular hyperbolic model, were used to fit the light response curves of 10 species of ferns in subtropical region. Nine parameters, such as determination factor (R²), light saturation point (LSP), light compensation point (LCP), maximum net photosynthetic rate (P_nmax), dark respiration rate (R_d), and apparent quantum efficiency (AQE), were analyzed to investigate the fitting effect of light response model and photosynthetic characteristics for subtropical fern species. The results showed that the modified rectangular hyperbolic model and non-rectangular hyperbolic model had the best fitting effect on the 10 species of subtropical ferns in this study, and the LSP fitting effect of the modified rectangular hyperbolic model was the best, while the non-rectangular hyperbolic model had the highest fitting accuracy. The clustering analysis of photosynthetic parameters and Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) showed that the photosynthetic characteristics of 10 subtropical fern species were both similar and species-specific. Polystichum makinoi (Tagawa) had the highest shade tolerance, Parathelypteris glanduligera (Kunze) Ching had the highest strong light tolerance, and Stenoloma chusanum Ching had the highest photosynthetic potential. In conclusion, the non-rectangular hyperbolic model and modified rectangular hyperbolic model are more suitable for the light response curve fitting of subtropical fern species. The 10 subtropical fern species show similarities and species specificity in three photosynthetic characteristics, namely shade tolerance, strong light tolerance, and photosynthetic potential.