Global parameterization and validation of a two-leaf light use efficiency model for predicting gross primary production across FLUXNET sites - Université de Lorraine Access content directly
Journal Articles Journal of Geophysical Research: Biogeosciences Year : 2016

Global parameterization and validation of a two-leaf light use efficiency model for predicting gross primary production across FLUXNET sites

Yanlian Zhou
  • Function : Author
Xiaocui Wu
  • Function : Author
Weimin Ju
  • Function : Correspondent author
  • PersonId : 1012203

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Shaoqiang Wang
  • Function : Author
T. Andrew Black
  • Function : Author
Rachhpal Jassal
  • Function : Author
Shijie Han
  • Function : Author
Fenghua Zhao
  • Function : Author
Gregory Starr
  • Function : Author
Georg Wohlfahrt
Petra d'Odorico
  • Function : Author
David Cook
M. Altaf Arain
  • Function : Author
Jason Beringer
  • Function : Author
Janusz Olejnik
  • Function : Author

Abstract

Light use efficiency (LUE) models are widely used to simulate gross primary production (GPP). However, the treatment of the plant canopy as a big leaf by these models can introduce large uncertainties in simulated GPP. Recently, a two-leaf light use efficiency (TL-LUE) model was developed to simulate GPP separately for sunlit and shaded leaves and has been shown to outperform the big-leaf MOD17 model at six FLUX sites in China. In this study we investigated the performance of the TL-LUE model for a wider range of biomes. For this we optimized the parameters and tested the TL-LUE model using data from 98 FLUXNET sites which are distributed across the globe. The results showed that the TL-LUE model performed in general better than the MOD17 model in simulating 8 day GPP. Optimized maximum light use efficiency of shaded leaves (epsilon(msh)) was 2.63 to 4.59 times that of sunlit leaves (epsilon(msu)). Generally, the relationships of epsilon(msh) and epsilon(msu) with epsilon(max) were well described by linear equations, indicating the existence of general patterns across biomes. GPP simulated by the TL-LUE model was much less sensitive to biases in the photosynthetically active radiation (PAR) input than the MOD17 model. The results of this study suggest that the proposed TL-LUE model has the potential for simulating regional and global GPP of terrestrial ecosystems, and it is more robust with regard to usual biases in input data than existing approaches which neglect the bimodal within-canopy distribution of PAR.
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Dates and versions

hal-01557860 , version 1 (26-09-2017)

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Yanlian Zhou, Xiaocui Wu, Weimin Ju, Jing M. Chen, Shaoqiang Wang, et al.. Global parameterization and validation of a two-leaf light use efficiency model for predicting gross primary production across FLUXNET sites. Journal of Geophysical Research: Biogeosciences, 2016, 121 (4), pp.1045 - 1072. ⟨10.1002/2014JG002876⟩. ⟨hal-01557860⟩
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