Schmidt, BHM; Kalbitz, K; Braun, S; Fuß, R; McDowell, WH; Matzner, E: Microbial uptake and mineralization of dissolved organic nitrogen from forest floors, Soil Biology & Biochemistry, 43, 1742-1745 (2011), doi:10.1016/j.soilbio.2011.04.021 | |
Abstract: 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 (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. |
Antrittsvorlesung: |
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Mi. 22.05.2024 Funktionelle Pilzökologie: Diversität und Prozesse auf unterschiedlichen Skalen |
BayCEER-Kolloquium: |
Do. 06.06.2024 Tracking plant diversity dynamics on islands over thousands of years |
Mo. 10.06.2024 Arsenic biogeochemistry from paddy soil to rice grain |
Do. 13.06.2024 Seeing the forest beneath the trees: Mycorrhizal fungi as trait integrators of ecosystem processes |
Ökologisch-Botanischer Garten: |
Mi. 29.05.2024 Führung | "Grüne Apotheke: Heilpflanzen" |