TY  - JOUR
AU  - Prevost-Boure, N.C.
AU  - Ngao, J.
AU  - Berveiller, D.
AU  - Bonal, D.
AU  - Damesin, C.
AU  - Dufrene, E.
AU  - Lata, J.C.
AU  - Le Dantec, V.
AU  - Longdoz, B.
AU  - Ponton, S.
AU  - Soudani, K.
AU  - Epron, D.
PY  - 2009//
TI  - Root exclusion through trenching does not affect the isotopic composition of soil CO2 efflux
T2  - Plant Soil
JO  - Plant and Soil
SP  - 1
EP  - 13
VL  - 319
IS  - 1-2
PB  - SPRINGER
KW  - Stable carbon isotopes
KW  - Natural abundance
KW  - Soil respiration
KW  - Trenched plot
KW  - Rainforest
KW  - Temperate forest
N2  - 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.
SN  - 0032-079X
N1  - ISI:000266143400001
ID  - Prevost-Boure_etal2009
ER  -