Simulation of Canopy Resistance for Paddy Rice Based on PenmanMonteith Model

doi:10.3969/j.issn.1000-6362.2015.01.003

Abstract

Abstract: A model simulating the relationship between rice canopy surface resistance（rc）and meteorological as well as environmental factors（net solar radiation，air temperature，saturated vapour pressure deficit and soil moisture）was established in Nanjing area from 2012 to 2013.Considering the canopy surface resistance parameterization of Penman Monteith formula，this model specifically referenced Jarvis stomatal resistance model and compared the simulated results with observed evapotranspiration by lysimeter in order to check the accuracy of the model.The results showed that the agreement indices of the rice canopy surface resistance model were 0.991 for 2012 and 0.810 for 2013.It was shown that the model was capable of modeling paddy field water consumption with agreement index of 0.967 and 0.953，respectively when combining the model with PenmanMonteith formula.Also，sensitivity analysis of the model showed that saturated vapour pressure deficit（a2）had a great impact on the model.As a result，this model can help simplify the calculation of canopy resistance and avoid errors in observation，which can be used as one of the ways to calculate paddy field water consumption.

Key words: Canopy resistance, Lysimeter, Paddy rice, Meteorological factors, Environmental factors, Model

ZHAO Hua，SHEN Shuang he，HUA Rong qiang，TAO Su lin，ZHANG Xue song. Simulation of Canopy Resistance for Paddy Rice Based on PenmanMonteith Model[J]. Chinese Journal of Agrometeorology, 2015, 36(01): 17-23.

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