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Zeitschriftenartikel

Nitrogen and phosphorus budgets in experimental grasslands of variable diversity

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons62531

Roscher,  C.
Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons62551

Schumacher,  J.
Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons62549

Schulze,  E. D.
Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Zitation

Oelmann, Y., Kreutziger, Y., Temperton, V. M., Buchmann, N., Roscher, C., Schumacher, J., et al. (2007). Nitrogen and phosphorus budgets in experimental grasslands of variable diversity. Journal of Environmental Quality, 36(2), 396-407. doi:10.2134/jeq2006.0217.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000E-D590-E
Zusammenfassung
Previous research has shown that plant diversity influences N and P cycles. However, the effect of plant diversity on complete ecosystem N and P budgets has not yet been assessed. For 20 plots of artificially established grassland mixtures differing in plant diversity, we determined N and P inputs by bulk and dry deposition and N and P losses by mowing (and subsequent removal of the biomass) and leaching from April 2003 to March 2004. Total deposition of N and P was 2.3 +/- 0.1 and 0.2 +/- 0.01 g m(-2) yr(-1), respectively. Mowing was the main N and P loss. The net N and P budgets were negative (-6.3 +/- 1.1 g N and -1.9 +/- 0.2 g P m(-2) yr(-1)). For N, this included a conservative estimate of atmospheric N-2 fixation. Nitrogen losses as N2O were expected to be small at our study site (< 0.05 g m(-2) yr(-1)). Legumes increased the removal of N with the harvest and decreased leaching of NH4-N and dissolved organic nitrogen (DON) from the canopy. Reduced roughness of grass-containing mixtures decreased dry deposition of N and P. Total dissolved P and NO3-N leaching from the canopy increased in the presence of grasses attributable to the decreased N and P demand of grass-containing mixtures. Species richness did not have an effect on any of the studied fluxes. Our results demonstrate that the N and P fluxes in managed grassland are modified by the presence or absence of particular functional plant groups and are mainly driven by the management. [References: 58]