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Effect of microbial activity and nitrogen mineralization on free-living nitrogen fixation in permanent grassland soils

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 N-2-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 N-2 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 N-2-fixation and SIR or N-mineralization with a significant rhizosphere effect. The study has demonstrated that the activity of free-living N-2-fixers is more important in soils having low active microbial biomass and low N-mineralization rates in these permanent grasslands.
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https://hal-bioemco.ccsd.cnrs.fr/bioemco-00166647
Contributor : Luc Abbadie <>
Submitted on : Wednesday, August 8, 2007 - 11:07:06 AM
Last modification on : Saturday, September 19, 2020 - 4:39:22 AM

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  • HAL Id : bioemco-00166647, version 1

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Ashok Patra, Xavier Le Roux, Luc Abbadie, Annie Clays-Josserand, Franck Poly, et al.. Effect of microbial activity and nitrogen mineralization on free-living nitrogen fixation in permanent grassland soils. JOURNAL OF AGRONOMY AND CROP SCIENCE 193, 2007, pp.153-156. ⟨bioemco-00166647⟩

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