# LTSER platform P3M: Mediterranean Plain, Piedmont and Plateau

Héloïse Benard, Pierre-Alain Ayral, Jean-Stéphane Bailly, Brice Boudevillain, Cedric Champollion, Jérôme Demarty, Christelle Batiot-Guilhe, Didier Josselin, Hervé Jourde, Patrick Lachassagne, et al.

<figure><img src="image_1.png" /></figure>

To cite this version:

Héloïse Benard, Pierre-Alain Ayral, Jean-Stéphane Bailly, Brice Boudevillain, Cedric Champollion, et al.. LTSER platform P3M: Mediterranean Plain, Piedmont and Plateau. IAHS - AISH Scientific Assembly 2022, May 2022, Montpellier, France. hal-03752134

HAL Id: hal-03752134

https://hal.inrae.fr/hal-03752134

Submitted on 16 Aug 2022

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.

<figure><img src="image_2.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
<figure><img src="image_3.png" /></figure>

# LTSER platform P3M : Mediterranean Plain, Piedmont and Plateau

Héloïse Bénard<fnref n="1" />, Pierre-Alain Ayral2,3, Jean-Stéphane Bailly4, Brice Boudevillain7, Cédric Champollion5, Jérôme Demarty6, Christelle Batiot-Guilhe8, Didier Josselin2, Hervé Jourde8, Patrick Lachassagne6, Jérôme Molenat1, Guillaume Nord7, and Fabrice Vinatier1

The eLTER H2020 process aims at developing an European ecosystem research infrastructure and at creating long term observations platforms. In this context, we proposed a platform called P3M (Mediterranean **Plain, Piedmont and Plateau**) located in the Mediterranean basin that is considered as a hot-spot of both biodiversity and climate change. P3M provides an observation system of several contrasted socio-ecosystems representative of the Mediterranean diversity from local to territorial scales.

P3M will study the connection between strong hydro-pedo-climatic gradients and biodiversity that are subjected to an increasing variability of hydroclimatic processes, while being strongly connected to anthropic drivers. P3M is structured around a toposequence of four different agro-ecosystems where the natural and cultivated sphere are highly connected : (i) Cevenol medium-size mountains characterized with hillside forest ecosystem and extensive agriculture on the valley bottom, (ii) High-altitude plateau with an agropastoralism-dryland system and a karstic hydrogeology reagent to precipitations that highly influences the quality and quantity of the water ressource on the entire platform, (iii) Cevenol piedmont natural forest and garrigue ecosystems, (iv) Herault watershed hilly plains organized around cultivated plains and mainly viticultural activities.

This scientific collaboration will focus on i) analyzing the hydro-eco-sedimentary dynamics in between each ecosystems but also throughout the entire toposequence, ii) identifying the interactions between those dynamics and human activities within the different ecosystems iii) predicting the evolution of mediterranean landscape facing climate change and providing adapting solutions. To face these challenges, a transdisciplinary approach is necessary to better understand the connections between the increasing pressure of human activity, climatic phenomena, biophysic processus and biodiversity.

P3M will answer European environmental scientific issues by ensuring the stability, the availability and the European standardisation of abiotic, biotic and social datas on a long term scale but also the reception of foreigners scientists. This platform gathers four OZCAR labelised observation networks (OMERE, Larzac Observatory, OHM-CV, MEDYCCYS) but also includes ANAEE and ICOS sites. Non-academics partners will take part in this project, for example the national and regional park or the local watershed facilities, to integrate the existing data but also to facilitate the transfer of research to local policies.

<footnote n="1">¹INRAE, UMR LISAH, France</footnote>

<footnote n="2">²CNRS InSHS (Univ. Avignon), antenne cévenole ESPACE, France</footnote>

<footnote n="3">³EMA IMT Alès, HydroSciences Montpellier, France</footnote>

<footnote n="4">⁴AgroParisTech, UMR LISAH, France</footnote>

<footnote n="5">⁵UM / CNRS, Géosciences Montpellier, France</footnote>

<footnote n="6">⁶IRD / UM / CNRS, HydroSciences Montpellier, France</footnote>

<footnote n="7">⁷Université Grenoble Alpes / CNRS / IRD, Institut des Géosciences de l'Environnement, France</footnote>

<footnote n="8">⁸UM/IRD/CNRS, HydroSciences Montpellier, France</footnote>
<figure><img src="image_4.png" /></figure>