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Microbial immobilization and mineralization of dissolved organic nitrogen from forest floors

Title data

Schmidt, Bettina ; Kalbitz, Karsten ; Braun, Sabine ; Fuß, Roland ; McDowell, William H. ; Matzner, Egbert:
Microbial immobilization and mineralization of dissolved organic nitrogen from forest floors.
In: Soil Biology & Biochemistry. Vol. 43 (2011) Issue 8 . - pp. 1742-1745.
ISSN 0038-0717
DOI: https://doi.org/10.1016/j.soilbio.2011.04.021

Abstract in another language

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) isonly 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 (0e10 mg N L1) 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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER85131
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Chair Soil Ecology - Univ.-Prof. Dr. Egbert Matzner
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:32
Last Modified: 27 Apr 2016 09:08
URI: https://eref.uni-bayreuth.de/id/eprint/19071