Photosynthetic response to light conditions in 1.5 years seedling of 3 Casuarina equisetifolia clones ,701 ,A8 and W6 ,were tested. The measured data were fitted with the rectangular hyperbola model and the classical Farquhar model. The results showed that estimates by the two models were highly eon determination r were above 0. 99). Simulated with sistent and reached significant level (all coefficients of determination r2 were above 0.99).Simulated with rectangular hyperbola model, light compensation points of the 3 clones were 43.43,46. 02 and 30. 66 μmol · m-2 · s-1 , respectively, whereas light saturation points were 2 707.67,2 579. 54 and 2 404. 71 μmol · m-2 · s-1, respectively. Maximum net photosynthetic rate were 20.69, 22.42 and 15.64 μmol · m-2 · s-1 ,respectively. The light compensation points, the light saturation points and the dark respiration rate of 701 and A8 were higher than those of W6.%对701、A8、W6共3个木麻黄Casuarina equisetifolia无性系1.5年生幼树进行光响应测定,利用直角双曲线修正模型及经典Farquhar生化模型分别进行模拟.结果表明,2种模型模拟符合度非常高,且达显著水平.利用直角双曲线修正模型模拟的3个木麻黄无性系光合作用光补偿点分别为43.43、46.02和30.66μmol·m-2·s-1,光饱和点分别为2 707.67、2 579.54和2 404.71 μmnol·m-2·s-1,最大净光合速率分别为20.69、22.42和15.64μmo1·m-2·s-1,701、A8具有较高的光合作用光补偿点、光饱和点和暗呼吸速率,W6光补偿点、光饱和点和暗呼吸速率较低.
展开▼
