• Aucun résultat trouvé

A process-based interpretation of high-resolution tree-ring stable isotope variations: from simple to more complex models

N/A
N/A
Info
Télécharger
Protected

Academic year: 2022

Partager "A process-based interpretation of high-resolution tree-ring stable isotope variations: from simple to more complex models"

Copied!
2
0
0

Chargement.... (Voir le texte intégral maintenant)

Texte intégral

(1)

HAL Id: hal-02804903

https://hal.inrae.fr/hal-02804903

Submitted on 5 Jun 2020

HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.

L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

A process-based interpretation of high-resolution tree-ring stable isotope variations: from simple to more

complex models

Jérôme Ogée, Lisa Wingate

To cite this version:

Jérôme Ogée, Lisa Wingate. A process-based interpretation of high-resolution tree-ring stable isotope variations: from simple to more complex models. TRACE Conference, May 2012, Potsdam, Germany.

1 p. �hal-02804903�

(2)

A process-based interpretation of high-resolution tree-ring stable isotope variations: from simple to more complex models

Jérôme Ogée and Lisa Wingate INRA EPHYSE UR1263, Bordeaux, France

Abstract

The carbon and oxygen stable isotope ratios of wood cellulose are good indicators of not only climate but also plant physiology. Attempts to interpret tree-ring isotope variations mechanistically have resulted in the development of different isotope-enabled models that vary in complexity and their degree of success to capture tree-ring isotope variations. In this presentation we will investigate and compare a simple big-leaf modelling approach (Ogée et al 2009) with that of the multi-layer soil-vegetation-atmosphere transfer model, MuSICA (Ogée et al., 2003; Wingate et al., 2010). This model comparison will be carried out against a new high-resolution stable isotope tree-ring dataset from five coniferous FLUXNET sites spanning a significant gradient of moisture (MAP range of 280 to 930mm) and temperature (MAT range of -1 to 18oC). This environmental gradient allowed us to test the need for added complexity in process-based models and understand better the drivers of tree-ring isotope signals from a plant physiological perspective.

References

Ogée, J., Barbour, M.M., Wingate, L., Bert, D., Bosc, A., Stievenard, M., Lambrot, C., Pierre, M., Berbigier, P., Bariac, T., Loustau, D. and Dewar, R. (2009). A single-substrate model to interpret intra-annual stable isotope signals in tree ring cellulose. Plant, Cell and Environment, Vol. 32, 8, 1071-1090, doi:10.1111/j.1365-3040.2009.01989.x

Ogée, J., Brunet, Y., Loustau, D., Berbigier, P. & Delzon, S. (2003). MuSICA, a CO2, water and energy multi-layer, multi-leaf pine forest model: evaluation from hourly to yearly time scales and sensitivity analysis. Global Change Biology, Vol. 9, 697-717

Wingate, L., Ogée, J., Burlett, R., Bosc, A., Devaux, M., Grace, J., Loustau, D. and Gessler, A.(2010). Photosynthetic carbon isotope discrimination and its relationship to the carbon isotope signals of stem, soil and ecosystem respiration. New Phytologist, doi10.1111/j.1469- 8137.2010.03384x

Références

Télécharger maintenant ( PDF - 2 Page - 132.25 KB )

Documents relatifs

Getting to understand more and more a (simple?) model of stochastic gene expression

The bursting noise gives rise to higher or slower autocorrelation time depending on the respective value of the mean production rate and the degradation rate.

A SIMPLE ULTRA HIGH RESOLUTION SQUID RESISTANCE BRIDGE

blems by measuring the current ratio directly with a room temperature current comparator (figure lb); these devices have very high accuracy and resolu- tion (^ 1 in 10 7 )

The Influence of the Inclusion of Soil Freezing on Simulations by a Soil–Vegetation–Atmosphere Transfer Scheme

Simple calculations using the observed soil water content (which would tend to underestimate G because of the aforementioned soil water decrease caused by freezing) and the

A Generic First-Order Radiative Transfer Modelling Approach for the Inversion of Soil and Vegetation Parameters from Scatterometer Observations

Parameter estimates are obtained by using ASCAT σ 0 measurements together with auxiliary Leaf Area Index (LAI ) and soil-moisture (SM) datasets provided by the Interactions

Can We Use Satellite-Based Soil-Moisture Products at High Resolution to Investigate Land-Use Differences and Land–Atmosphere Interactions? A Case Study in the Savanna

Comparison of soil moisture (SM) provided by DISPATCH (blue), SMOS-BEC (red), and SMOS (yellow) and 10-cm in situ measurements (black line), using measurements beneath the trees

A simple proof of the tree-width duality theorem

We give a simple proof of the “tree-width duality theorem” of Seymour and Thomas that the tree-width of a finite graph is exactly one less than the largest order of its brambles..

A simple presentation of the effective topos

We have built a realisability framework and with a different but equivalent definition of the Ef- fective Topos, we have proved that the Effective Topos was a topos with an object

A simple parameterization of nitrogen limitation on primary productivity for global vegetation models

Substract- ing this sink from the simulated global terrestrial carbon sink for the period 1970 to 2000, one obtains a carbon sink increase of 3.3 GtC/yr–0.6 GtC/yr = 2.7 GtC/yr for