CO2-response function of radiation use efficiency in rice for climate change scenarios

Pesquisa Agropecuária Brasileira

Nereu Augusto Streck¹  Hamilton Telles Rosa¹  Lidiane Cristine Walter¹  Michel Rocha Da Silva¹  Lilian Osmari Uhlmann¹ 

[1],Universidade Federal de Santa Maria Departamento de Fitotecnia Santa Maria RS ,Brazil

关键词: Oryza sativa;    global warming;    modeling;    photosynthesis;    Oryza sativa;    aquecimento global;    modelagem;    fotossíntese;   

DOI  :  10.1590/S0100-204X2012000700001

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate a generalized response function to the atmospheric CO2 concentration [f(CO2)] by the radiation use efficiency (RUE) in rice. Experimental data on RUE at different CO2 concentrations were collected from rice trials performed in several locations around the world. RUE data were then normalized, so that all RUE at current CO2 concentration were equal to 1. The response function was obtained by fitting normalized RUE versus CO2 concentration to a Morgan-Mercer-Flodin (MMF) function, and by using Marquardt's method to estimate the model coefficients. Goodness of fit was measured by the standard deviation of the estimated coefficients, the coefficient of determination (R²), and the root mean square error (RMSE). The f(CO2) describes a nonlinear sigmoidal response of RUE in rice, in function of the atmospheric CO2 concentration, which has an ecophysiological background, and, therefore, renders a robust function that can be easily coupled to rice simulation models, besides covering the range of CO2 emissions for the next generation of climate scenarios for the 21st century.

【 授权许可】

CC BY   
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