Simulating leaf stomatal conductance of reed(Phragmites communis) plant in Panjin wetland

The stomata are a key channel of gas exchange between plants and their environment.Stomatal conductance is an important parameter for estimating the fluxes between vegetation and atmosphere.Leaf stomatal conductance of reed plant in Panjin wetland were simulated,based on the long term leaf photosynthetically ecophysiological observations of reed plant.It showed that there was a linear relationship between stomatal conductance and photosynthesis rate,and a non-rectangular hyperbolic response of photosynthesis to photosynthetically active radiation(PAR).Thus,a leaf stomatal conductance model was constructed by coupling a Ball-Berry model and a non-rectangular hyperbolic photosynthesis model.The model could simulate the stomatal conductance directly from environmental variables,whilst taking account of the interaction between stomata movement and photosynthesis.The simulated values of stomatal conductance were correspondence with the observed data very well(R=0.82,P0.05).