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- Title
Effect of Microbial Activity and Nitrogen Mineralization on Free-living Nitrogen Fixation in Permanent Grassland Soils.
- Authors
Patra, A. K.; Le Roux, X.; Abbadie, L.; Clays-Josserand, A.; Poly, F.; Loiseau, P.; Louault, F.
- Abstract
Free-living nitrogen (N) fixation can be important for sustainable soil fertility, particularly in extensively managed soils with low abundance of leguminous plant species. However, the factors affecting free N2-fixation in situ are still poorly documented. We investigated the role of microbial active biomass activity, particularly substrate-induced respiration (SIR) and net N mineralization, on the free-living N2 fixation in soils under a semi-natural grassland ecosystem in France. Analysis of replicated bulk soil and rhizospheric soil samples obtained from sites experiencing contrasting grazing regimes revealed highly significant negative relationships (P < 0.01) between free-living N2-fixation and SIR or N-mineralization with a significant rhizosphere effect. The study has demonstrated that the activity of free-living N2-fixers is more important in soils having low active microbial biomass and low N-mineralization rates in these permanent grasslands.
- Subjects
FRANCE; NITROGEN fixation; SOIL fertility; PLANT species; LEGUMES; BIOMASS; GRASSLANDS
- Publication
Journal of Agronomy & Crop Science, 2007, Vol 193, Issue 2, p153
- ISSN
0931-2250
- Publication type
Article
- DOI
10.1111/j.1439-037X.2006.00247.x