野生小蓬竹的光合光响应曲线及其模型拟合  

Model fitting on light response curve of photosynthesis of wild Drepanostachyum luodianense

作　　者：廖小锋[1] 刘济明[1] 张东凯[1] 靳勇[1] 张勇[1] 闫国华[1] 王敏[1] 

机构地区：[1]贵州大学林学院,贵州贵阳550025

出　　处：《中南林业科技大学学报》2012年第3期124-128,共5页Journal of Central South University of Forestry & Technology

基　　金：贵州省科技厅对外合作项目"濒危植物小蓬竹生态适应性及育苗技术研究"[黔科合外G字(2009)70010];贵州大学引进人才基金项目"濒危植物小蓬竹耐旱性及小生境生长特征研究";贵州大学大学生SRT项目"喀斯特濒危植物小蓬竹耐旱性研究"

摘　　要：应用5种典型的光响应模型对野生小蓬竹叶片光响应曲线进行了拟合,并探讨了几种模型在光响应研究中的适用性。结果表明:①直角双曲线、非直角双曲线及指数函数模型无法求取植物最大净光合速率(Pnmax)和光饱和点(Isat)的解析解,而结合其它方法拟合的相应值却与实测值相差很大,同时也不能处理光抑制部分的光响应数据;②二次多项式模型能够一定程度地处理光抑制部分的光响应数据,但其拟合得到的各项光合参数与实测值相差较大,甚至会出现逻辑错误;③修正的直角双曲线模型拟合的各项光合参数均比较准确,同时也能很好地处理发生光抑制部分的光响应数据;④采用修正的直角双曲线模型拟合的野生小蓬竹Pnmax、Isat、光补偿点(Ic)、暗呼吸速率(Rd)和初始量子效率(α)分别为8.53μmol.m-2s-1、1 750.75μmol.m-2s-1、21.40μmol.m-2s-1、1.06μmol.m-2s-1、0.054。Several typical models of light-response curve of leaf net photosynthesis,such as non-rectangular hyperbolic model,rectangular hyperbolic model,prompted rectangular hyperbolic model and index function model,were tested on wild Drepanostachyum luodianense,and the applicability of these models also were investigated.The results were summarized as follows：①the plant＇s analytical solution of maximum net photosynthetic rate（Pnmax） and saturation point（Isat） couldn＇t be solved by rectangular hyperbola model,non-rectangular hyperbola model and exponential equation model,while the values simulated by combining other methods existed a big difference compared with the measured value,and the data under photoinhibition couldn＇t be processed by these three models;②the quadratic polynomial model could process the data under photoinhibition to a certain extent,but the photosynthetic parameters simulated by it also existed larger difference compared with the measured value,even generated logic error;③the photosynthetic parameters simulated by modified rectangular hyperbola model all were close to the measured values,and this model also could well process the data under photoinhibition;④the Pnmax,Isat,compensation point（Ic）,respiration rate（Rd） and initial quantum efficiency（a） of wild D.luodianense simulated by modified rectangular hyperbola model were 8.53 μmol·m^-2s^-1,1 750.75 μmol·m^-2s^-1,21.40 μmol·m^-2s^-1,1.06 μmol·m^-2s^-1 and 0.054 respectively.

关 键 词：小蓬竹 光响应曲线 光响应模型 修正的直角双曲线 

分 类 号：S718.43[农业科学—林学]