Root exclusion through trenching does not affect the isotopic composition of soil CO2 efflux - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Plant and Soil Year : 2009

Root exclusion through trenching does not affect the isotopic composition of soil CO2 efflux

Jérome Ngao
Daniel Berveiller
Damien Bonal
Eric Dufrene
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Kamel Soudani
Daniel Epron

Abstract

Disentangling the autotrophic and heterotrophic components of soil CO2 efflux is critical to understanding the role of soil system in terrestrial carbon (C) cycling. In this study, we combined a stable C-isotope natural abundance approach with the trenched plot method to determine if root exclusion significantly affected the isotopic composition (δ13C) of soil CO2 efflux (RS). This study was performed in different forest ecosystems: a tropical rainforest and two temperate broadleaved forests, where trenched plots had previously been installed. At each site, RS and its δ13C (δ13CRs) tended to be lower in trenched plots than in control plots. Contrary to RS, δ13CRs differences were not significant. This observation is consistent with the small differences in δ13C measured on organic matter from root, litter and soil. The lack of an effect on δ13CRs by root exclusion could be from the small difference in δ13C between autotrophic and heterotrophic soil respirations, but further investigations are needed because of potential artefacts associated with the root exclusion technique.

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bioemco-00353850 , version 1 (16-01-2009)

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Nicolas Chemidlin Prévost-Bouré, Jérome Ngao, Daniel Berveiller, Damien Bonal, Claire Damesin, et al.. Root exclusion through trenching does not affect the isotopic composition of soil CO2 efflux. Plant and Soil, 2009, 319 (1-2), pp.1-13. ⟨10.1007/s11104-008-9844-5⟩. ⟨bioemco-00353850⟩
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