Michalzik, B; Matzner, E: Dynamics of dissolved organic nitrogen and carbon in a Central European Norway spruce ecosystem, European Journal of Soil Science, 50, 579-590 (1999)
Abstract:
Dissolved organic nitrogen and carbon (DOC) are significant in the C and N cycle in terrestrial ecosystems. Little is known about their dynamics in the field and the factors regulating their concentrations and fluxes. We followed the fluxes and concentrations of the two in a Norway spruce (Picea abies [L.] Karst.) forest ecosystem in Germany from 1995 to 1997 by sampling at fortnightly intervals. Bulk precipitation, through-fall, forest floor percolates from different horizons and soil solutions from different depths were analysed for major ions, dissolved organic N and DOC. The largest fluxes and concentrations were observed in percolates of the Oi layer, which contain amino N and amino sugar N as the major components. The average ratio of dissolved organic C to N in forest floor percolates corresponded to the C/N ratio of the solid phase. Concentrations and fluxes were highly dynamic with time and decreased with depth. The largest fluxes in forest floor percolates occurred when the snow melted. The concentrations and fluxes of DON were significantly correlated to DOC, however the correlation was weak, indicating different mechanisms of release and consumption. The dynamics of neither dissolved organic N nor DOC in forest floor percolates were explained by pH and ionic strength of the soil solution or by the water flux despite large variations of these. Furthermore, the release of these fractions from the forest floor was not related to the quality and amount of through-fall. Concentrations of dissolved organic N in forest floor percolates increased with soil temperature, while temperature effects on DOC were less pronounced, but their fluxes from the forest floor were not correlated with temperature. In the growing season concentrations of both dissolved organic N and C in forest floor percolates decreased with increasing intensity of through-fall. Thus, the average throughfall intensity was more important than the amount of percolate in regulating their concentrations in forest floor percolates. Our data emphasize the role of dissolved organic N and DOC in the N and C cycle of forest ecosystems.
Upcoming ...



BayCEER Colloquium:
Th. 2019-11-14 now
Analysis of ozone formation and trend over northern Bavaria by using stochastic and deterministic models
Th. 2019-11-21
Quantification of subsurface properties using the groundwater response to Earth and atmospheric tides
Conferences:
Fr. 2019-11-22
Geoökologie-Tagung 2019
Ecological-Botanical Garden:
Su. 2019-11-24
Mikroplastik in der Umwelt
Talk:
Fr. 2019-11-15
Changing the game in Earth Observation - The European Union’s Copernicus programme -
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): 961.4 hPa
Lufttemperatur: 2.7 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 7 h/d
Wind (Höhe 17m): 9.0 km/h
Wind (Max.): 24.1 km/h
Windrichtung: SO

...more
Globalstrahlung: 0 W/m²
Lufttemperatur: 0.6 °C
Niederschlag: 0.0 mm/24h
Sonnenschein: 2 h/d
Wind (Höhe 32m): 25.7 km/h

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