【摘要】 分析了青冈(Quercusglauca)光合速率(Pn)与光强(L)、气温(T)和空气相对湿度(RH)在不同叶片类型、季节及全年几个水平上的相互关系,发现Pn与L正相关,在T<25℃时Pn主要由L决定,T>25℃后T对Pn有负作用,T越高负作用越明显,土壤湿度低时T的负作用表现明显。Pn与RH关系较小,可忽略。不同类型叶片(阳生、阴生)对环境因子反应有较大差异。在1年中的绝大部分时间里,都能通过光照和温度的观测获得叶片光合速率的估计,如果再附加一定的限制条件则可用L来预测Pn更多还原

【Abstract】 Relationships among the net photosynthesis ( Pn ), light intensity ( L ),air temperature( T ),relative humidity ( RH ) of Quercus glauca at the levels of different leaf types, seasons, and the whole year were analyzed. Results showed that Pn was a positively bound to the L. The L determined Pn when T <25℃. But when T >25℃, it had a negative effect on Pn , and the effect became stronger as T rising. Low soil moisture made a strongly negative effect of T on Pn . The relation between Pn and RH was light and could be neglected. The respond of different leaf type to the environment factors differed greatly. The Pn of Quercus glauca could be estimated by the L and T through the model in the most time of one year, and could be estimated only by L if some limits were added.更多还原