%0 Journal Article
%T Root exclusion through trenching does not affect the isotopic composition of soil CO2 efflux
%A Prevost-Boure, N.C.
%A Ngao, J.
%A Berveiller, D.
%A Bonal, D.
%A Damesin, C.
%A Dufrene, E.
%A Lata, J.C.
%A Le Dantec, V.
%A Longdoz, B.
%A Ponton, S.
%A Soudani, K.
%A Epron, D.
%J Plant and Soil
%D 2009
%V 319
%N 1-2
%I SPRINGER
%@ 0032-079X
%F Prevost-Boure_etal2009
%O ISI:000266143400001
%O exported from refbase (http://php.ecofog.gf/refbase/show.php?record=203), last updated on Wed, 04 May 2011 14:04:30 -0300
%X 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 (delta C-13) of soil CO2 efflux (R-S). 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, R-S and its delta C-13 (delta C-13(Rs)) tended to be lower in trenched plots than in control plots. Contrary to R-S, delta C-13(Rs) differences were not significant. This observation is consistent with the small differences in delta C-13 measured on organic matter from root, litter and soil. The lack of an effect on delta C-13(Rs) by root exclusion could be from the small difference in delta C-13 between autotrophic and heterotrophic soil respirations, but further investigations are needed because of potential artefacts associated with the root exclusion technique.
%K Stable carbon isotopes
%K Natural abundance
%K Soil respiration
%K Trenched plot
%K Rainforest
%K Temperate forest
%P 1-13