【作者】 金志凤； 李永秀； 景元书；

【Author】 Jin Zhi-Feng~1 Li Yong-Xiu~2 Jing Yuan-Shu~2 (1Zhejiang Climate Center,Hangzhou 310017,China;2 College of Applied Meteorology,Nanjing University of Information Science & Technology,Nanjing 210044,China)

【机构】 浙江省气候中心； 南京信息工程大学应用气象学院；

【摘要】 采用 LI—6400光合作用仪测定了杨梅成熟期（6月下旬）叶片的净光合速率（P_n）日变化,并分析了 P_n 与气孔导度（G_s）、蒸腾速率（T_r）等植物生理参数以及光合有效辐射（PAR）、叶片温度（T₁）、二氧化碳浓度（C_i） 等生态因子的相关关系。结果表明,杨梅成熟期 P_n 日变化为双峰型曲线,存在"午休"现象;P_n 与 G_s 和 T_r 均有显著的二次曲线关系,与 PAR 有双曲线关系,与 T₁有 S 型曲线关系,与 C_i 有二次曲线关系。杨梅的光合作用与生理生态因子的关系密切,可为探索杨梅生产力提供科学依据。更多还原

【Abstract】 Daily changes of net photosynthetic rate（P_n） of Myrica rubra in maturing stage,as well as the relationships between net photosynthetic rate and related physiological ecological factors including stomatic conductance to H₂O（G_s）,transpiration rate（T_r）,photosynthetic available radiation（PAR）,leaf temperature（T₁） and CO₂ concentration（C_i） were studied using LI-6400 Portable Photosynthesis System.The results showed that the daily changes of net photosynthetic rate presented a double apexes curve with a slightly "midday depression". There existed a conic curve relation between net photosynthetic rate of Myrica rubra and G_s,so did with Tr.A hyperbola curve relationship was found between P_n and PAR,S function relationship between P_n and T₁,a conic curve relationship between P_n and C_i concentration.The closely relation between photosynthesis of Myrica rubra and physiological ecological factors provide a scientific bases to probe Myrica rubra productivity.更多还原