Seminar: Vanessa Haverd

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Abstract
Several lines of evidence point to an increase in the activity of the terrestrial biosphere over recent decades1-4, impacting the global net land carbon sink (NLS) and its control on the growth of atmospheric carbon dioxide (ca). Global terrestrial gross primary production (GPP) — the rate of carbon fixation by photosynthesis — has risen by (31 ± 5)% since 19004. This increase remains to be attributed. Here we show that this increase in GPP is predominantly driven by CO2.. We reconcile leaf-level and global atmospheric constraints on trends in modelled biospheric activity to reveal a global CO2 fertilisation effect on photosynthesis of 30% since 1900, or 47% for a doubling of ca above the pre-industrial level. Our historic value is nearly twice as high as current estimates3,5 (17 ± 4)% that do not use the full range of available constraints. Consequently, under a future low emissions scenario6, our projected natural land carbon sink (174 PgC, 2006 to 2099) is 57 PgC larger than if a lower CO2 fertilisation effect comparable with current estimates is assumed. These findings suggest a larger beneficial role of the land carbon sink in modulating future excess anthropogenic CO2 in lower emissions scenarios consistent with the target of the Paris agreement to stay below 2°C warming, and underscores the importance of preserving terrestrial carbon sinks.
Speaker
Vanessa Haverd, Climate Science Centre, CSIRO Oceans & Atmosphere, Canberra, Australia
Vanessa Haverd has a Ph.D. in physical chemistry (Oxford University, 2003), and joined the Continental Biogeochemical Cycles Team at CSIRO in 2007 as a terrestrial biosphere modeller. She has co-developed new descriptions of fundamental physical processes, including coupled transport of heat, water and stable isotopes in soil and litter, encapsulated in the SLI (Soil-Litter-Isotope) model; heat storage, and radiative transfer in plant canopies. In 2013, she published the first complete carbon budget for the Australian continent, quantifying the contribution of the Australian biosphere to the global carbon budget, using multiple observational constraints. More recently, she co-developed a novel approach to representing vegetation structural dynamics in Earth system modeling, introducing vegetation structure and disturbance patterns into land surface models. Vanessa contributes CABLE-POP simulations to the annual update of the Global Carbon Budget, as part of the TRENDY ensemble of global terrestrial biosphere models.

Workshop BENCHAFOR

On October 2nd & 3rd, scientists from the ONF, INRA and DSF will discuss the current knowledge on the biology and ecology of cockchafers to explore novel options to limit the insect outbreaks and their detrimental impact on forest regenerations.

The common and forest Cockchafer are two beetle species well known for the damages they can inflict to forest ecosystems. Whereas the adults may occasion spectacular defoliations to adult trees, the larvae also feed on the roots of young trees causing severe mortality in forest regenerations, further impacting the whole forest management process. Eastern European countries had been facing recurrent infestations since the 1960’s; in France, cockchafer populations seem to have turned from endemic to epidemic in the last 10 years, with dramatic damages reported in young forest stands of Picardie and Northern Alsace. In Germany, chemical treatments proved to be efficient in reducing populations and subsequent damages but their use is now forbidden. A wide diversity of alternatives had been investigated in Europe, mainly based on biological control methods. To date, these studies did not produce results that could be developed and ultimately applied in everyday forest management.

Forest managers now question the opportunity of modifying forest ecosystem parameters that are critical for the different phases of the cockchafer lifecycle. Such actions are likely to produce short-term efficient methods with limited environmental impacts. This project is based on a benchmarking approach of the acquired scientific knowledge of cockchafer biology and of thetechnical experiences accumulated in the European countries that have been subjected to outbreaks in the last decades. We aim at investigating whether changes in silvicultural management are able to limit cockchafer population dynamics.

Our first objective is to establish a state-of-the-art review of the knowledge concerning the environmental factors which determine cockchafer outbreaks. Then, our second objective is to propose a protocol to describe stand cover structure and ground vegetation characteristics which determine cockchafer larval density. These two objectives will initiate national and international networking on the research for solutions to cockchafer damages to forests.

Finally, the proposed project will provide a framework of hypothesis for the research of ecological solutions to prevent cockchafer outbreaks. This innovative project is likely to initiate a technical and scientific strategy for the management crisis caused by cockchafer outbreaks.

 

#MT180

Congratulations to Nathalie Carol for her award, 1st Audience Prize, during the “My Thesis in 180 s“ competition at the University of Lorraine. She did a great job in describing her joint LabEx ARBRE project with the National Forest Service, AgroParisTech, INRA and University of Lorraine.DZeXJOKWkAAQWT9 DZeiAlAWAAY9YJa.jpg-large

CiTIQUE – Une application qui dépasse les frontières

Vignette signalement tiques

Le programme de recherche participative collaboratif CiTIQUE, porté par l’INRA et le LabEx ARBRE, et soutenu par de nombreuses structures telles que le Centre Permanent d’Initiatives pour l’Environnement Nancy-Champenoux et l’Université de Lorraine, dépasse les frontières !

L’application Signalement-Tique, maillon important de CiTIQUE est mise à l’honneur du quotidien “The Telegraph”. Retrouvez l’intégralité de l’article sur ce lien.

Signalement-Tique est une application disponible gratuitement pour les smartphones ios et android ainsi que via son site internet. Elle permet de signaler rapidement aux scientifiques les piqûres de tiques, qu’elle soient repérées sur un humain ou un animal.

Pour plus de renseignements : site web CiTIQUE

 

 

Journée de restitution « ClimAgri »

ClimAgriLa Région Grand Est a été sélectionnée par l’ADEME courant 2017 au titre de l’appel à projets national « initiation et mise en œuvre de nouvelles démarches et nouveaux diagnostics ClimAgri® à l’échelle régionale ».

Afin de vous présenter et d’échanger autour des premiers résultats de la démarche régionale « Climagri® : vers une stratégie Grand Est en matière d’énergie, gaz à effet de serre (GES) et qualité de l’air en agriculture, élevage, viticulture et forêt », une journée dédiée se tiendra le mardi 20 février 2018 de 9h30-16h30 au Centre INRA Grand Est-Nancy Salle de conférence.

Cette séance est ouverte à tous citoyens et professionnels sur inscription avant le 15 février : laetitia.prevost@grandest.chambagri.fr

Pour plus de renseignements : programme détaillé et fiche de présentation de la démarche.

Salon – Truffe : une planète à découvrir

Affiche Salon Truffe Valence

Laure Fauchery et Claude Murat (UMR IAM lNRA-UL) ont présenté les activités de recherches sur les truffes développées dans le cadre du LabEx ARBRE au salon “Truffe : une planète à découvrir” les 27 et 28 janvier 2018 à Valence. Le salon était organisé par la ville de Valence avec la participation des trois syndicats de trufficulteurs de la Drôme. Le salon a eu beaucoup de succès avec 5 000 à 6 000 visiteurs sur deux jours. Sur le stand, les visiteurs pouvaient observer des ectomycorhizes de truffe sous une loupe binoculaire. IMG_6054Une démonstration d’analyse ADN pour identifier les truffes et, ainsi éviter les fraudes, a été réalisée à l’aide du thermocycleur en temps réel du laboratoire mobile M-POETE (ANAEE). Cette démonstration a beaucoup intéressé les professionnels en démystifiant les analyses ADN.

Pour plus d’informations : cliquez ici