乐昌含笑幼苗在不同光照环境下的光响应模型拟合分析  

Fitting Analysis of Light Response Models of Michelia chapensis Seedlings Under Different Light Environments

作　　者：周欢 韦如萍[2] 李吉跃 苏艳 胡德活[2] 郑会全[2] ZHOU Huan;WEI Ruping;LI Jiyue;SU Yan;HU Dehuo;ZHENG Huiquan(College of Forestry and Landscape Architecture,South China Agricultural University,College of Forestry and Landscape Architecture,Guangzhou 510642,China;Guangdong Academy of Forestry,Guangdong Provincial Key Lab.of Silviculture,Protection and Utilization,Guangzhou 510520,China)

机构地区：[1]华南农业大学林学与风景园林学院,广东省森林植物种质创新与利用重点实验室,广州510642 [2]广东省林业科学研究院,广东省森林培育与保护利用重点实验室,广州510520

出　　处：《热带亚热带植物学报》2024年第4期531-539,共9页Journal of Tropical and Subtropical Botany

基　　金：广东省林业科技创新项目(2022KJCX010)资助。

摘　　要：为探究不同光强下乐昌含笑(Michelia chapensis)光响应特征及光响应模型的适用性,以乐昌含笑1 a生幼苗为试材,设置5种光强100%、70%、50%、30%、10%全光照处理,测定其光响应曲线,并采用直角双曲线模型(RH)、非直角双曲线模型(NRH)、指数模型(EM)、修正直角双曲模型(MRH)及修正指数模型(MEM)5种模型对其进行拟合,进而利用R_a~2、均方误差(MSE)、平均绝对误差(MAE)结合光合参数实测值与拟合值对5种模型拟合效果进行综合评价。结果表明,应用RH、NRH和EM模型拟合不同光强下乐昌含笑光响应曲线不符合其光合-光响应特征;MRH模型拟合的各项光合参数与实测值最为接近,MEM模型次之。因此,MRH模型具有较高的拟合精度和适用性,是拟合不同光强下乐昌含笑幼苗光合-光响应特征的最适模型。To elucidate the light response characteristics and the applicability of the light response model of Michelia chapensis under different light intensities,one-year-old M.chapensis seedlings were grown under five light intensities,including 100%,70%,50%,30%and 10%of nature light.The light response curves were measured and fitted by five models,such as rectangular hyperbola model(RH),nonrectangular hyperbola model(NRH),exponential model(EM),modified rectangular hyperbola model(MRH)and modified exponential model(MEM).Then,the fitting effects of the five models were comprehensively evaluated by using Ra2,MAE and MSE combined with the measured values and fitting values of photosynthetic parameters.The results showed that the light response curves of M.chapensis under different light intensities fitted by RH,NRH and EM model did not conform to its photosynthetic-light response characteristics.The photosynthetic parameters fitted by the MRH models were the closest to the measured values,followed by the MEM model.Therefore,the MRH model has high fitting accuracy and applicability and is the most suitable model for fitting the photosynthetic light response characteristics of M.chapensis under different light intensities.

关 键 词：乐昌含笑 光照强度 光合作用 光响应曲线 光响应模型 

分 类 号：S792.99[农业科学—林木遗传育种]