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Nitrogen, organic carbon and sulphur cycling in terrestrial ecosystems: linking nitrogen saturation to carbon limitation of soil microbial processes
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SYSNO ASEP 0396982 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Nitrogen, organic carbon and sulphur cycling in terrestrial ecosystems: linking nitrogen saturation to carbon limitation of soil microbial processes Author(s) Kopáček, Jiří (BC-A) RID, ORCID
Cosby, B. J. (US)
Evans, C. D. (GB)
Hruška, J. (CZ)
Moldan, F. (SE)
Oulehle, F. (CZ)
Šantrůčková, H. (CZ)
Tahovská, K. (CZ)
Wright, R. F. (NO)Source Title Biogeochemistry. - : Springer - ISSN 0168-2563
Roč. 115, 1-3 (2013), s. 33-51Number of pages 19 s. Action BIOGEOMON : international symposium on ecosystem behavior /7./ Event date 15.07.2012-20.07.2012 VEvent location Northport Country US - United States Event type WRD Language eng - English Country NL - Netherlands Keywords nitrogen ; carbon ; sulphur ; acidification ; forest soil ; modelling Subject RIV DJ - Water Pollution ; Quality R&D Projects GAP504/12/1218 GA ČR - Czech Science Foundation (CSF) Institutional support BC-A - RVO:60077344 UT WOS 000325116700003 EID SCOPUS 84884903568 DOI 10.1007/s10533-013-9892-7 Annotation Elevated and chronic nitrogen (N) deposition to N-limited terrestrial ecosystems can lead to nitrogen saturation, with resultant ecosystem damage and leaching of nitrate (NO3–) to surface waters. Present-day N deposition, however, is often a poor predictor of NO3– leaching, and the pathway of the ecosystem transition from N-limited to N-saturated remains incompletely understood. The dynamics of N cycling are intimately linked to the associated carbon (C) and sulphur (S) cycles. We hypothesize that N saturation is associated with shifts in the microbial community, manifest by a decrease in the fungi-to-bacteria ratio and a transition from N to C limitation. Three mechanisms could lead to lower amount of bioavailable dissolved organic C (DOC) for the microbial community and to C limitation of N-rich systems: (1) Increased abundance of N for plant uptake, causing lower C allocation to plant roots; (2) chemical suppression of DOC solubility by soil acidification; and (3) enhanced mineralisation of DOC due to increased abundance of electron acceptors in the form of SO42– and NO3– in anoxic soil micro-sites. Here we consider each of these mechanisms, the extent to which their hypothesised impacts are consistent with observations from intensively-monitored sites, and the potential to improve biogeochemical models by incorporating mechanistic links to the C and S cycles. Workplace Biology Centre (since 2006) Contact Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Year of Publishing 2014
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