亚热带4个水土保持树种幼苗光响应和CO_(2)响应模型拟合  

Model fitting of light response and CO_(2) response of four subtropical tree species seedlings for soil and water conservation

作　　者：张冲 刘芳梅 彭铁双 刁文颖 陈楚湘 何功秀[1] ZHANG Chong;LIU Fangmei;PENG Tieshuang;DIAO Wenying;CHEN Chuxiang;HE Gongxiu(Key Laboratory of Soil and Water Conservation and Desertification Combating of Hunan Province,Central South University of Forestry&Technology,Changsha 410004,Hunan,China;Huaihua Water Resources Bureau,Huaihua 418000,Hunan,China)

机构地区：[1]中南林业科技大学水土保持与荒漠化防治湖南省高校重点实验室,湖南长沙410004 [2]怀化市水利局,湖南怀化418000

出　　处：《湖南林业科技》2025年第2期1-9,共9页Hunan Forestry Science & Technology

基　　金：国家重点研发计划课题(2021YFD2201303)。

摘　　要：筛选闽楠、香樟、赤皮青冈、红榉等4个水土保持树种幼苗光响应与CO_(2)响应曲线的最适模型,分析光合特性差异,为苗木培育与林分经营提供依据。在测定幼苗光合参数的基础上,采用直角双曲线(RH)、非直角双曲线(NRH)、修正直角双曲线(MRH)和指数函数(EF)模型拟合光响应过程,采用RH、Michaelis-Menten(M-M)和MRH模型拟合CO_(2)响应过程。结果表明:(1)光响应与CO_(2)响应模型拟合的R2均达0.98以上,其中NRH模型对闽楠光响应拟合最优,MRH模型对香樟、红榉和赤皮青冈的光响应及4个树种的CO_(2)响应拟合最优;(2)MRH模型对闽楠、香樟、红榉的光响应参数及4个树种的CO_(2)响应参数拟合值最接近实测值,EF模型则对赤皮青冈的光响应参数拟合最优;(3)红榉和香樟的最大净光合速率与暗呼吸速率显著高于闽楠和赤皮青冈的,香樟的光补偿点最低,闽楠的光饱和点最高且具有高羧化能力(高CO_(2)饱和点)和低CO_(2)补偿点。建议采用MRH模型评价香樟与红榉的光合能力,采用NRH+MRH组合评价闽楠的,采用MRH+EF组合评价赤皮青冈的。Ihe optimal models for light and CO_(2) response curves of four soil and water conservation tree species(Phoebe bournei,Cinnamomum camphora,Cyclobalanopsis gilva,and Zelkova serrala)seedlings were screened,and their photosynthetic characteristics were analyzed to guide afforestation practices.Photosynthesis-light and CO_(2) response curves were measured.The light response processes were fitted by rectangular hyperbola(RH),non-rectangular hyperbola(NHH),modified rectangular hyperlmla(MRH),and exponential function(EF)models;while CO_(2) response processes were fitted by RH,Michaelis-Menten(M-M),and MRH models.The results showed:(1)All models achieved R^(2)>0.98.NRH model provided the best fit for P.bournei light response,while MRH model performed best for light responses of C.camphora,Z.serrata,C.gilva and CO_(2) responses of all species.(2)The MRH model fitted the light response parameters of P.lx)urnei,C.camphora and Z.serrata and the CO_(2) response parameters the four species closest to the measured values,while the EF model fitted the light response parameters of C.gilva best.(3)Z.serrata and C.camphora exhibited higher maximum net photosynthetic rate and dark respiration rate than P.bournei and C.gilva.C.camphora had the lowest light compensation point,while P.bournei displayed the highest light saturation point with superior carboxylation capacity(high CO_(2) saturation point)and low CO_(2) compensation point.M RH model was recommended for evaluating the photosynthetic capacity of C.camphora and Z.serrata,NRH+MRH for R bournei,and MRH+EF for C.gilva.

关 键 词：光响应曲线 CO_(2)响应曲线 模型 光合参数 水土保持树种 

分 类 号：S722.5[农业科学—林木遗传育种]