| 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. |
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| BayCEER Colloquium: |
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| Th. 2024-04-25 Perspectives and challenges in the restoration and conservation of two isolated habitats: gypsum and cliffs |
| BayCEER Short Courses: |
| We. 2024-04-24 Mobile Film Making Workshop (for PhDs/PostDosc/Profs of BayCEER) |
| Fr. 2024-04-26 Mobile Film Making Workshop (for students of BayCEER) |
| Ecological-Botanical Garden: |
| Fr. 2024-04-19 now Führung | Gesteine im Ökologisch-Botanischen Garten |
| Su. 2024-04-21 Führung | Den ÖBG kennenlernen: Allgemeine Gartenführung |