柳属植物光合-光响应曲线模型拟合  

Modeling Photosynthetic Light-response Curve in Salix L.

作　　者：蒋冬月[1] 钱永强[1] 费英杰[1] 王正超[1] 孙振元[1] 

机构地区：[1]中国林业科学研究院林业研究所/国家林业局林木培育重点实验室,北京100091

出　　处：《核农学报》2015年第1期169-177,共9页Journal of Nuclear Agricultural Sciences

基　　金：林业公益性行业科研专项(201304115);中央公益性科研院所基本科研业务费专项(CAFYBB008)

摘　　要：为了研究柳属植物的光合-光响应曲线模型,利用直角双曲线模型、非直角双曲线模型和直角双曲线修正模型对柳属植物的光合-光响应曲线进行拟合。结果表明,直角双曲线拟合所得的初始量子效率、暗呼吸速率、最大光合速率和光饱和点的值均高于非直角双曲线的拟合结果,但由于在有限光强下,2模型均不存在极值,因此无法直接得到最大净光合速率和饱和光强;而直角双曲线修正模型存在极值点,可以直接求得植物的饱和光强和最大净光合速率,且拟合值更加接近实测值。通过比较另外5种柳属植物净光合速率的实测值与模型估计值,得出直角双曲线修正模型估计值的相对误差之和最小,证明了直角双曲线修正模型的估计值更接近实测值。因此,直角双曲线修正模型是拟合柳属植物光合-光响应曲线的最佳模型。利用此模型可有效地对柳属植物光能利用效率进行评价,为高光效柳树的筛选提供理论参考。In order to select the optimum model of photosynthetic light-curve in Salix L. The photosynthetic lightresponse curves of 6 Salix L. species were determined using rectangular hyperbola,non-rectangular hyperbola and modified rectangular hyperbola models in order to investigate which model better describes the photosynthetic lightresponse curve in Salix L. The results showed that the initial quantum efficiency,dark respiration rate,maximum photosynthetic rate and light saturation point from rectangular hyperbola model were higher than those from nonrectangular hyperbola model the maximum photosynthetic rate and light saturation point were not determined directly,because of no extrema in the models under the limited light intensity. However,the maximum photosynthetic rate and light saturation point can be calculated directly in the modified rectangular hyperbola model because of the existence of extrema. And the result from modified rectangular hyperbola model was mostly closed to the measured data. Compared the net photosynthetic rate between measured value and estimated value of fitting curve models of other five Salix plants,the sum of relative error of estimated value from modified rectangular hyperbola model was the least,which suggest that the estimated value from modified rectangular hyperbola model was mostly closed to the measured data. In conclusion,modified rectangular hyperbola model should be used to estimate photosynthetic light-response curve parameters in Salix L. It is feasible for Salix spp. to evaluate radiation use efficiency using the model,which provides the scientific basis for selecting willows with high photosynthetic efficiency.

关 键 词：柳树 光合作用 光响应曲线 模型拟合 

分 类 号：Q945.11[生物学—植物学]