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锦橙、脐橙的树冠外部光合速率的季节变化曲线均呈双峰型,最高峰出现在六月,八月略有下降,九月再次回升,出现次高峰,在两个高峰期,锦橙光合速率极显著于脐橙。叶绿素含量和叶含 N 量对光合速率具有正向效应,而比叶重对光合速率无直接正效应。
The curves of seasonal changes of external photosynthetic rate of canopy of Jincheng and Navel orange all showed bimodal pattern with the highest peak appearing in June and a slight decrease in August and again rising in September with the second highest peak. The rate is extremely significant in navel orange. Chlorophyll content and leaf N content had a positive effect on photosynthetic rate, while specific leaf weight had no direct effect on photosynthetic rate.