Apport de l'approche multicouche et du signal isotopique pour la compréhension de la respiration du sol en écosystème forestier

Abstract

Relevance of multilayer approach and isotopic signal in the understanding of soil respiration in forest ecosystem. Soil CO2 efflux is one of the most important flux in carbon cycle. Its amplitude is estimated to 68 ± 4 Pg C per year. In temperate forest, it represents approximately 60-80% of total CO2 emissions from the ecosystem (ecosystem respiration). Given its magnitude and the consequences of any amplitude change on the atmosphere carbon dioxide content, it is essential to improve knowledge of the mechanisms that govern it and know precisely the influence of environmental variables (edaphic and climatic). This paper aims to show the interest of conducting multilayer analysis of the mechanisms causing this flow (transport and production) rather than restricting the study to the soil surface. In addition, this article highlights the isotopic tool benefits to improve the mechanistic understanding of this efflux.

Keywords

• Soil CO2 efflux
• multilayer approach
• stable isotopes
• forest soils
• carbon cycle