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| Hauptseite > Publikationsdatenbank > Nitrogen and phosphorus budgets in experimental grasslands of variable diversity |
| Hauptseite > Publikationsdatenbank > Nitrogen and phosphorus budgets in experimental grasslands of variable diversity |
| Journal Article | PreJuSER-56229 |
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2007
ASA [u.a.]
Madison, Wis.
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Please use a persistent id in citations: doi:10.2134/jeq2006.0217
Abstract: 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 N(2)O 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 NH(4)-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 NO(3)-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.
Keyword(s): Agriculture: methods (MeSH) ; Biodiversity (MeSH) ; Biomass (MeSH) ; Fabaceae: growth & development (MeSH) ; Nitrates: analysis (MeSH) ; Nitrogen: analysis (MeSH) ; Phosphorus: analysis (MeSH) ; Poaceae: growth & development (MeSH) ; Quaternary Ammonium Compounds: analysis (MeSH) ; Rain (MeSH) ; Soil: analysis (MeSH) ; Nitrates ; Quaternary Ammonium Compounds ; Soil ; Phosphorus ; Nitrogen ; J
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