Abstract
Biomass production by perennial plants promises to increase land use efficiency and reduce greenhouse gas emissions from cropping systems dedicated to bioenergy production. The modelling of both biomass production and the environmental impacts of these systems over the long term is needed in order to evaluate their sustainability. New equations have been added to the STICS soil-crop-atmosphere model to provide a better description of perennial organs and their relationship with non-perennial ones, corresponding to the rhizomes and shoots, respectively in the Miscanthus × giganteus case study. Their description is intended to be generic for perennial plants, supported by the functional approach of STICS. The new version of STICS 8 was calibrated using published data and then validated against independent data. It was able to simulate the biomass and nitrogen content of the shoots (with a model efficiency of 0.95 and 0.70, respectively) and reproduce the dynamic of biomass and nitrogen in perennial organs (with a model efficiency of 0.41 and 0.63, respectively). Some of the model’s improvements are discussed. Modifications to the model allowed simulations of the effect of cultural practices, such as nitrogen fertilisation or harvest date, on the biomass and nitrogen content of rhizomes and shoots.
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Acknowledgments
The assistance provided by C. Demay, C. Dominiarczyk, J. Haxaire, E. Mignot, M. Preudhomme and A. Teixeira and the experimental unit around the acquisition of data is gratefully acknowledged. The authors gratefully thank M. Launay for the time spent for constructive discussions on the model. The authors thank all physiologists and modellers around the world whose work and publications allow the modelling of plant processes. This research has been funded by OSEO as part of the Futurol project.
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Appendix: Model Equations
Appendix: Model Equations
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1.
Perennial organs (Rhizome and associated coarse roots in 0–25 cm depth)
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Remobilisable biomass and nitrogen
$$ \mathrm{RESPERENNE}=\mathrm{PROPRESP}\times \mathrm{MAPERENNE} $$(1)$$ \mathrm{QNRESPERENNE}=\mathrm{PROPRESPN}\times \mathrm{QNPERENNE} $$(2) -
Non remobilisable biomass and nitrogen
$$ \mathrm{RESPERENNESTRUC}=\left(1-\mathrm{PROPRESP}\right)\times \mathrm{MAPERENNE} $$(3)$$ \mathrm{QNRESPERENNESTRUC}=\left(1-\mathrm{PROPRESPN}\right)\times \mathrm{QNPERENNE} $$(4) -
Death
$$ \Delta \mathrm{PERENNESEN}=\mathrm{TAUXMORTP}\times \mathrm{MAPERENNE} $$(5)$$ \Delta \mathrm{QNPERENNESEN}=\Delta \mathrm{PERENNESEN}\times \frac{\mathrm{QNPERENNE}}{\mathrm{MAPERENNE}} $$(6)
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2.
Non-perennial organs (stems and leaves)
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Maximal temporary reserves
$$ \mathrm{RESTEMPMAX}=\mathrm{PROPRES}\times \frac{\mathrm{MAFEUIL}\mathrm{VERTE}}{\mathrm{MAFEUIL}}\times \mathrm{MASECVEG} $$(7) -
C/N ratio and nitrogen contents
$$ \mathrm{CSURNFEUIL}=\frac{\mathrm{PARAZOFMORTE}}{\mathrm{NNI}} $$(8)$$ \mathrm{CSURNTIGE}=\frac{\mathrm{PARAZOTMORTE}}{\mathrm{NNI}} $$(9)$$ \mathrm{QNVEGSTRUC}=\left[\frac{\mathrm{CFEUIL}}{\mathrm{CSURNFEUIL}}\right]+\left[\frac{\mathrm{CTIGESTRUC}}{\mathrm{CSURNTIGE}}\right] $$(10)$$ \mathrm{QNRESTEMP}=\mathrm{QNVEG}-\mathrm{QNVEGSTRUC} $$(11) -
Biomass and nitrogen remobilisation
$$ \Delta \mathrm{REMOBIL}=\mathrm{EFREMOBIL}\times \Delta \mathrm{REMOBIL}\mathrm{BRUT} $$(12)$$ \varDelta CO2\mathrm{RESPERENNE}=0.40\times \left(1-\mathrm{EFREMOBIL}\right)\times \Delta \mathrm{REMOBILBRUT} $$(13)$$ \Delta \mathrm{REMOBILN}=\Delta \mathrm{REMOBILBRUT}\times \frac{\mathrm{QNRESPERENNE}}{\mathrm{RESPERENNE}} $$(14) -
Temporary reserves
$$ \mathrm{RESTEMP}=\mathrm{MASECVEG}-\mathrm{MAFEUIL}-\mathrm{MATIGESTRUC}-\mathrm{MAENFRUIT} $$(15)$$ \Delta \mathrm{REMOBSEN}={\displaystyle \sum_{J=1}^n\varDelta \mathrm{MS}(J)\cdot \left(1-\mathrm{RATIOSEN}\right)\cdot \mathrm{PFEUILVERTE}(J)} $$(16)with n = leaf lifespan
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3.
Transfer and allocation
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Biomass transfer and its allocation:
$$ \Delta \mathrm{RESTEMP}=\mathrm{RESTEMP}-\mathrm{RESTEMPMAX} $$(17)$$ \begin{array}{ll}\mathrm{if}\hfill & \begin{array}{ll}\mathrm{RESPERENNE}<\mathrm{PROPRESP}\times \mathrm{MAPERENNE}\hfill & \mathrm{then}\hfill \end{array}\hfill \\ {}\hfill & \Delta \mathrm{RESPER}=\Delta \mathrm{RESTEMP}\hfill \\ {}\hfill & \Delta \mathrm{RESPSTRUC}=0\hfill \\ {}\mathrm{else}\hfill & \hfill \\ {}\hfill & \Delta \mathrm{RESPER}=\mathrm{PROPRESP}\times \Delta \mathrm{RESTEMP}\hfill \\ {}\hfill & \Delta \mathrm{RESPSTRUC}=\left(1-\mathrm{PROPRESP}\right)\times \Delta \mathrm{RESTEMP}\hfill \\ {}\mathrm{endif}\hfill & \hfill \end{array} $$(18) -
Nitrogen transfer and its allocation:
$$ \Delta \mathrm{RESTEMPN}=\Delta \mathrm{RESPSTRUC}\times \mathrm{CNRESPSTRUC} $$(19)$$ \Delta \mathrm{RESTEMP}\mathrm{N}=\Delta \mathrm{RESTEMP}\times \frac{\mathrm{QNRESTEMP}}{\mathrm{RESTEMP}} $$(20)$$ \begin{array}{ll}\mathrm{if}\hfill & \begin{array}{ll}\mathrm{RESPERENNE}<\mathrm{RESPERENNEMAX}\hfill & \mathrm{then}\hfill \end{array}\hfill \\ {}\hfill & \Delta \mathrm{RESPSTRUC}\mathrm{N}=0\hfill \\ {}\hfill & \Delta \mathrm{RESPERN}=\Delta \mathrm{RESTEMPN}\hfill \\ {}\mathrm{else}\hfill & \hfill \\ {}\hfill & \Delta \mathrm{RESPSTRUC}\mathrm{N}=\Delta \mathrm{RESPSTRUC}\times \mathrm{CNRESPSTRUC}\hfill \\ {}\hfill & \Delta \mathrm{RESPERN}=\Delta \mathrm{RESTEMPN}-\Delta \mathrm{RESPSTRUC}\mathrm{N}\hfill \\ {}\mathrm{endif}\hfill & \hfill \end{array} $$(21)$$ \begin{array}{llll}\mathrm{if}\hfill & \Delta \mathrm{RESPERN}<0\hfill & \mathrm{then}\hfill & \mathrm{TRANSFN}=-\Delta \mathrm{RESPERN}\hfill \end{array} $$(22)
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Strullu, L., Beaudoin, N., de Cortàzar Atauri, I.G. et al. Simulation of Biomass and Nitrogen Dynamics in Perennial Organs and Shoots of Miscanthus × Giganteus Using the STICS Model. Bioenerg. Res. 7, 1253–1269 (2014). https://doi.org/10.1007/s12155-014-9462-4
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DOI: https://doi.org/10.1007/s12155-014-9462-4