柑橘叶片气孔导度的环境响应模型研究

Study of Jarvis model on stomatal conductance of mandarin leaf

对柑橘叶片气孔导度的模拟研究结果表明 ,柑橘叶片气孔导度的环境响应模型中环境变量至少需含有光合有效辐射在内的 2个及其以上的环境变量 ;在温度较适宜的生长季除光合有效辐射外 ,环境变量对模型精度影响程度依次为饱和水汽压差 >叶片温度 >空气CO2 浓度 ;在温度和空气CO2 浓度变化较大的季节模型精确度则受单一环境变量和变量间交互作用的影响 ;3月份柑橘叶片气孔导度对环境因子的响应可采用Jarvis模型的G(Qp)g(De)形式 ,而 7月、11月和 3～ 11月份则均可采用G(Qp)g(De)g(Tl)

The simulation on stomatal conductance of mandarin leaf is studied. The results show that more than one environmental variables including the photosynthetic active radiation have significant effects on the stomatal conductance of mandarin leaf. During the warmer growing period, the sequence affecting the accuracy of Jarvis model for environmental factors is photosynthetic active radiation>vapor deficit>leaf temperature>air CO_2 concentration. There exit separate and mutual effects of environmental factors on the accuracy of Jarvis model during the growing period in which the temperature and the CO_2 concentration changed significantly. The stomatal conductance of mandarin leaf in response to environmental factors can adopt different forms of Jarvis model including G(Q_p)g(D_e)for March; G(Q_p)g(D_e)g(T_l)for July, November or for March～November.