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Esperschütz, J. ; Buegger, F. ; Winkler, J.B. ; Munch, J.-C. ; Schloter, M. ; Gattinger, A.*

Microbial response to exudates in the rhizosphere of young beech trees (Fagus sylvatica L.) after dormancy.

Soil Biol. Biochem. 41, 1976-1985 (2009)
DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Plants act as an important link between atmosphere and soil: CO2 is transformed into carbohydrates by photosynthesis. These assimilates are distributed within the plant and translocated via roots into the rhizosphere and soil microorganisms. In this study, 3 year old European beech trees (Fagus sylvatica L.) were exposed after the chilling period to an enriched 13C-CO2 atmosphere (δ13C = 660 parts per thousand - 80 parts per thousand) at the time point when leaves development started. Temporal dynamics of assimilated carbon distribution in different plant parts, as well as into dissolved organic carbon and microbial communities in the rhizosphere and bulk soil have been investigated for a 20 days period. Photosynthetically fixed carbon could be traced into plant tissue, dissolved organic carbon and total microbial biomass, where it was utilized by different microbial communities. Due to carbon allocation into the rhizosphere, nutrient stress decreased; exudates were preferentially used by Gram-negative bacteria and (mycorrhizal) fungi, resulting in an enhanced growth. Other microorganisms, like Gram-positive bacteria and mainly micro eucaryotes benefited from the exudates via food web development. Overall our results indicate a fast turnover of exudates and the development of initial food web structures. Additionally a transport of assimilated carbon into bulk soil by (mycrorhizal) fungi was observed.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Korrespondenzautor
Schlagwörter C labelling; Microbial biomass; Cmic; PLFA; Rhizosphere; Rhizodeposition; Beech; Dormancy; Chilling; C dynamics
ISSN (print) / ISBN 0038-0717
e-ISSN 1879-3428
Zeitschrift Soil Biology & Biochemistry
Quellenangaben Band: 41, Heft: 9, Seiten: 1976-1985 Artikelnummer: , Supplement: ,
Verlag Elsevier
Verlagsort Amsterdam
Nichtpatentliteratur Publikationen
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Soil Ecology (IBOE)
Research Unit Environmental Simulation (EUS)