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14 results on '"Albrecht, Remy"'

6. Vascular plant-mediated controls on atmospheric carbon assimilation and peat carbon decomposition under climate change

Author

Gavazov, Konstantin, Albrecht, Remy, Buttler, Alexandre, Dorrepaal, Ellen, Garnett, Mark H., Gogo, Sebastien, Hagedorn, Frank, Mills, Robert T. E., Robroek, Bjorn J. M., Bragazza, Luca, Gavazov, Konstantin, Albrecht, Remy, Buttler, Alexandre, Dorrepaal, Ellen, Garnett, Mark H., Gogo, Sebastien, Hagedorn, Frank, Mills, Robert T. E., Robroek, Bjorn J. M., and Bragazza, Luca

Abstract

Climate change can alter peatland plant community composition by promoting the growth of vascular plants. How such vegetation change affects peatland carbon dynamics remains, however, unclear. In order to assess the effect of vegetation change on carbon uptake and release, we performed a vascular plant-removal experiment in two Sphagnum-dominated peatlands that represent contrasting stages of natural vegetation succession along a climatic gradient. Periodic measurements of net ecosystem CO2 exchange revealed that vascular plants play a crucial role in assuring the potential for net carbon uptake, particularly with a warmer climate. The presence of vascular plants, however, also increased ecosystem respiration, and by using the seasonal variation of respired CO2 radiocarbon (bomb-C-14) signature we demonstrate an enhanced heterotrophic decomposition of peat carbon due to rhizosphere priming. The observed rhizosphere priming of peat carbon decomposition was matched by more advanced humification of dissolved organic matter, which remained apparent beyond the plant growing season. Our results underline the relevance of rhizosphere priming in peatlands, especially when assessing the future carbon sink function of peatlands undergoing a shift in vegetation community composition in association with climate change.

Published
2018
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10. Changes in microbial communities of green waste and sewage sludge composts following maturity: competition and co-metabolism

Author

Albrecht, Remy, Périssol, Claude, Ruaudel, Florence, Le Petit, Jean, Terrom, Gérard, Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UMR237-Aix Marseille Université (AMU)-Avignon Université (AU), and Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS)

Subjects
CLPP, [SDE]Environmental Sciences, metabolic diversity, CLPP compost, maturity, ComputingMilieux_MISCELLANEOUS, maturity 17, FEMS Microbiology Ecology compost
Abstract

International audience

Published
2009

14. Calibration of Chemical and Biological Changes in Cocomposting of Biowastes Using Near-Infrared Spectroscopy.

Author

ALBRECHT, REMY, JOFPRE, RICHARD, LE PETIT, JEAN, TERROM, GERARD, and PÉRISSOL, CLAUDE

Subjects
*COMPOSTING, *NEAR infrared spectroscopy, *CHEMICAL reactions, *BIODEGRADATION, *ORGANIC compounds research, *PROTEOLYTIC enzymes, *PHOSPHATASES
Abstract

Cocomposting of green wastes and sewage sludges is a complex process involving rapid biological and chemical changes. The objective of the study was to assess the usefulness of near-infrared reflectance spectroscopy (NIRS) to characterize these changes, as an alternative to standard procedures which are often time-consuming and laborious. Samples obtained during 146 days of composting were analyzed by 14 conventional methods and NIRS. Results from conventional methods demonstrated a noticeable separation into two distinct phases. An initial phase from 4 to 50-60 days was characterized by intensive degradation. A second phase up to 146 days was characterized by a decrease in all biological activities. NIRS calibrations allowed accurate predictions of nitrogen (N), carbon (C), C/N, humic acid (HA), pH, respiration, cellulase, phenoloxidase, and composting time successfully. Results were less accurate for organic matter (OM), protease, acid, and alkaline phosphatases and unsatisfactory for fulvic acid. NIRS calibration allows composting time/state of progress of maturation to be predicted accurately to within 10 days. A global index of composting evolution (GICE), resulting from the 14 parameters studied, is proposed. It is precisely predicted and shows that since NIRS is able to predict essential parameters of compost maturity, it could prove invaluable for monitoring biowastes cocomposting. [ABSTRACT FROM AUTHOR]

Published
2009
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