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.
Upcoming ...



BayCEER Colloquium:
Th. 2019-11-21 now
Quantification of subsurface properties using the groundwater response to Earth and atmospheric tides
Th. 2019-11-28
Rates and Dates in Alpine geosystems - Monitoring and reconstruction of geomorphologic processes
Conferences:
Fr. 2019-11-22
Geoökologie-Tagung 2019
Ecological-Botanical Garden:
Su. 2019-11-24
Mikroplastik in der Umwelt
SFB Mikroplastik:
We. 2019-11-27
Microbial Degradation of Plastics: Searching the Needle in the Haystack
BayCEER Blog
24.05.2019
Stoichiometric controls of C and N cycling
07.05.2019
Flying halfway across the globe to dig in the dirt – a research stay in Bloomington, USA
07.05.2019
EGU – interesting research and free coffee
16.04.2019
Picky carnivorous plants?
RSS Blog as RSS Feed
Weather research site
Luftdruck (356m): 964.6 hPa
Lufttemperatur: 6.5 °C
Niederschlag: 0.4 mm/24h
Sonnenschein: 3 h/d
Wind (Höhe 17m): 2.5 km/h
Wind (Max.): 7.2 km/h
Windrichtung: SW

...more
Globalstrahlung: 131 W/m²
Lufttemperatur: 5.7 °C
Niederschlag: 0.4 mm/24h
Sonnenschein: <1 h/d
Wind (Höhe 32m): 2.1 km/h

...more
This site makes use of cookies More information