Park, J-H; Matzner, E: Carbon control on nitrogen dynamics in the forest floor of an N-enriched deciduous forest ecosystem, Water, Air and Soil Pollution, 130, 643-648 (2001) | |
Abstract: Recent evidence from nitrogen (N) saturation studies indicates that forest floors in moderately impacted forests are the primary sink for atmospheric N inputs. Some researchers have suggested that the sink capacity of organic horizons is dependent on the amount of available carbon (C), which can be used for microbial N assimilation. To test the hypothesis that C limitation in forest floors exposed to chronic N deposition leads to an enhanced N leaching, a field C input manipulation experiment is under way in a deciduous forest. Since September 1999 aboveground C input has been doubled (by doubling litter input or by amending glucose) or excluded in replicated plots. Here we report the short-term response of concentrations of dissolved inorganic N (DIN: NO3--N and NH4+-N) in forest floor percolate to the C input manipulation. In autumn following the C input manipulation, DIN concentrations in forest floor percolate decreased in all plots except the No Litter plots compared to the pre-treatment summer concentrations. In contrast, the concentrations of DIN in the No Litter plots remained high. A different seasonal pattern of DIN leaching among treatments, along with measurements of microbial biomass C and potential nitrification rates of forest floor samples, indicates that seasonal N dynamics in the forest floor are largely regulated by C availability changes associated with litterfall C input. |
Antrittsvorlesung: |
---|
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" |