【摘要】 通过对滩地杨树净光合速率日变化与多种生理生态因子之间相互关系的研究 ,建立净光合速率与单生态因子间的模型及多种生理生态因子之间的多元回归模型 .结果表明 ,在长江中下游地区 ,光照、温度和气孔导度 (生理因子 )对杨树净光合速率的影响曲线均为 :y2 =Ax;在 I-69杨不同年龄阶段、不同生长地、不同高程条件下 ,影响其净光合速率的主导因子不同 ;影响 16.2 m高程处的 1年生、10年生杨树净光合速率的主导生态因子为气孔导度 ,影响 14 .9m高程处 3年生和 10年生杨树净光合速率的主导生态因子为温度 .更多还原

【Abstract】 The relations between the photosynthetic daily change and the eco physiological factors of the poplar trees on the Yangtze River beach land were studied. Results show that the relation curve between P n and photon flux density ( Q n ) is y 2=Ax and the same is that among P n , temperature ( T ) and stomatal conductance ( G s ); that the main factor affecting P n is quite different at varied developmental stages and in varied sites such as elevation; and that the main factor affecting P n for high elevation (16.2 m) is stomatal conductance and that for low elevation (14.9 m) is temperature.更多还原