Seasonal variations of belowground carbon transfer assessed by in situ 13CO2 pulse labelling of trees. Epron, D., Ngao, J., Dannoura, M., Bakker, M., R., Zeller, B., Bazot, S., Bosc, A., Plain, C., Lata, J., C., Priault, P., Barthes, L., & Loustau, D. Biogeosciences, 8(5):1153-1168, 2011. doi abstract bibtex Soil CO2 efflux is the main source of CO2 from forest ecosystems and it is tightly coupled to the transfer of recent photosynthetic assimilates belowground and their metabolism in roots, mycorrhiza and rhizosphere microor- ganisms feeding on root-derived exudates. The objective of our study was to assess patterns of belowground carbon allo- cation among tree species and along seasons. Pure 13CO2 pulse labelling of the entire crown of three different tree species (beech, oak and pine) was carried out at distinct phe- nological stages. Excess 13C in soil CO2 efflux was tracked using tuneable diode laser absorption spectrometry to deter- mine time lags between the start of the labelling and the ap- pearance of 13C in soil CO2 efflux and the amount of 13C allocated to soil CO2 efflux. Isotope composition (δ13C) of CO2 respired by fine roots and soil microbeswas measured at several occasions after labelling, together with δ13C of bulk root tissue and microbial carbon. Time lags ranged from 0.5 to 1.3 days in beech and oak and were longer in pine (1.6–2.7 days during the active growing season,more than 4 days dur- ing the resting season), and the transfer of C to the microbial biomasswas as fast as to the fine roots. The amount of 13Cal- located to soil CO2 effluxwas estimated from a compartment model. It varied between 1 and 21%of the amount of 13CO2 taken up by the crown, depending on the species and the sea- son. While rainfall exclusion that moderately decreased soil water content did not affect the pattern of carbon allocation to soil CO2 efflux in beech, seasonal patterns of carbon allo- cation belowground differed markedly between species, with pronounced seasonal variations in pine and beech. In beech, it may reflect competition with the strength of other sinks (aboveground growth in late spring and storage in late sum- mer) that were not observed in oak. We report a fast transfer of recent photosynthates to the mycorhizosphere and we con- clude that the patterns of carbon allocation belowground are species specific and change seasonally according to the phe- nology of the species.
@article{
title = {Seasonal variations of belowground carbon transfer assessed by in situ 13CO2 pulse labelling of trees},
type = {article},
year = {2011},
pages = {1153-1168},
volume = {8},
id = {38abd4a1-2aba-3e06-b093-c340f384f91c},
created = {2016-03-08T11:01:34.000Z},
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last_modified = {2017-03-14T17:16:18.928Z},
read = {false},
starred = {false},
authored = {false},
confirmed = {true},
hidden = {false},
citation_key = {Epron2011},
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abstract = {Soil CO2 efflux is the main source of CO2 from forest ecosystems and it is tightly coupled to the transfer of recent photosynthetic assimilates belowground and their metabolism in roots, mycorrhiza and rhizosphere microor- ganisms feeding on root-derived exudates. The objective of our study was to assess patterns of belowground carbon allo- cation among tree species and along seasons. Pure 13CO2 pulse labelling of the entire crown of three different tree species (beech, oak and pine) was carried out at distinct phe- nological stages. Excess 13C in soil CO2 efflux was tracked using tuneable diode laser absorption spectrometry to deter- mine time lags between the start of the labelling and the ap- pearance of 13C in soil CO2 efflux and the amount of 13C allocated to soil CO2 efflux. Isotope composition (δ13C) of CO2 respired by fine roots and soil microbeswas measured at several occasions after labelling, together with δ13C of bulk root tissue and microbial carbon. Time lags ranged from 0.5 to 1.3 days in beech and oak and were longer in pine (1.6–2.7 days during the active growing season,more than 4 days dur- ing the resting season), and the transfer of C to the microbial biomasswas as fast as to the fine roots. The amount of 13Cal- located to soil CO2 effluxwas estimated from a compartment model. It varied between 1 and 21%of the amount of 13CO2 taken up by the crown, depending on the species and the sea- son. While rainfall exclusion that moderately decreased soil water content did not affect the pattern of carbon allocation to soil CO2 efflux in beech, seasonal patterns of carbon allo- cation belowground differed markedly between species, with pronounced seasonal variations in pine and beech. In beech, it may reflect competition with the strength of other sinks (aboveground growth in late spring and storage in late sum- mer) that were not observed in oak. We report a fast transfer of recent photosynthates to the mycorhizosphere and we con- clude that the patterns of carbon allocation belowground are species specific and change seasonally according to the phe- nology of the species.},
bibtype = {article},
author = {Epron, Daniel and Ngao, J. and Dannoura, M. and Bakker, M. R. and Zeller, B. and Bazot, S. and Bosc, Alexandre and Plain, C. and Lata, J. C. and Priault, P. and Barthes, L. and Loustau, Denis},
doi = {10.5194/bg-8-1153-2011},
journal = {Biogeosciences},
number = {5},
keywords = {FR_FON}
}
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