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Open Access Green as soon as Postprint is submitted to ZB.
Microbial immobilization and mineralization of dissolved organic nitrogen from forest floors.
Soil Biol. Biochem. 43, 1742-1745 (2011)
Dissolved organic nitrogen (DON) plays a key role in the N cycle of many ecosystems, as DON availability and biodegradation are important for plant growth, microbial metabolism and N transport in soils. However, biodegradation of DON (defined as the sum of mineralization and microbial immobilization) is only poorly understood. In laboratory incubations, biodegradation of DON and dissolved organic carbon (DOC) from Oi and Oa horizons of spruce, beech and cypress forests ranged from 6 to 72%. Biodegradation of DON and DOC was similar in most samples, and mineralization of DON was more important than microbial immobilization. Nitrate additions (0-10 mg N L(-1)) never influenced either DON immobilization by microorganisms or mineralization. We conclude that soil microorganisms do not necessarily prefer mineral N over DON for meeting their N demand, and that biodegradation of DON seems to be driven by the microbial demand for C rather than N. Quantifying the dynamics of DON in soils should include consideration of both C and N demands by microbes.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Dissolved organic nitrogen; Dissolved organic carbon; Nitrate; Biodegradation; Mineralization; Microbial immobilization
ISSN (print) / ISBN
0038-0717
e-ISSN
1879-3428
Journal
Soil Biology & Biochemistry
Quellenangaben
Volume: 43,
Issue: 8,
Pages: 1742-1745
Publisher
Elsevier
Publishing Place
Amsterdam
Reviewing status
Peer reviewed
Institute(s)
Institute of Soil Ecology (IBOE)