樱桃叶片气孔导度动态模拟研究

目的]利用气孔导度(Gs)模型模拟红灯樱桃(Prunus avium L.‘Hongdeng’)叶片Gs在不同气象条件下的动态变化规律。方法]于2008～2011年在红灯樱桃园中,利用树冠上层叶片气体交换数据拟合相应参数。结果]在晴天,樱桃上层叶片Gs呈双峰曲线,最大峰值出现在08:00左右,约240 mmol/(m2.s);第2峰值在16:00,气孔的"午休"现象主要与中午较低的RH和Ψl有关。晴天时,一天当中Gs的平均值为154.36 mmol/(m2.s)。结论]该研究为采用Gs模型来模拟不同气象条件下果树叶片Gs提供了科学依据。

Study on Dynamic Simulation of Stomatal Conductance( Gs ) of Cherry(Prunus avium L.' Hongdeng' ) Leaf

Objective] The aim was to simulate the dynamic change law of cherry leaf’s Gs under different weather by Gs model.Method] The experiment was conducted in a ’Hongdeng’ cherry orchard.The parameters of the model were tested by the data observed in upper canopy from 2008 to 2011 during the growing seasons.Result] The diurnal course of Gs showed a double-peak curve on sunny days.And it reached the first peak of 240 mmol/(m2·s) at mid-morning about 08:00 and the second at mid-afternoon about 16:00.The decline of Gs at noon was caused by lower RH and Ψl.During a whole day(12 h),average Gs was about 154.36 mmol/(m2·s) on sunny day.Conclusion] The study provides a scientific basis for using Gs model to simulate Gs of fruit tree leaf under different weather.