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| HAL: halsde-00155959, version 1 |
| DOI: 10.1111/j.1439-037X.2006.00247.x |
| Detailed view |  Export this paper |
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| Journal of Agronomy and Crop Science 193 (2007) 153-156 |
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| Effect of Microbial Activity and Nitrogen Mineralization on Free-living Nitrogen Fixation in Permanent Grassland Soils |
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| Ashok Patra 1Xavier Le Roux 1 |
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| (2007) |
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| 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 substrateinduced 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 signifi- cant 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. |
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| 1: | Ecologie microbienne (EM) |
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CNRS : UMR5557 – INRA : UR1193 – Université Claude Bernard - Lyon I – Ecole Nationale Vétérinaire de Lyon |
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| 2: | Ecologie et évolution |
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CNRS : UMR7625 – Université Paris VI - Pierre et Marie Curie – Ecole Normale Supérieure de Paris - ENS Paris |
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| 3: | Unité d'Agronomie Site de Crouel |
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INRA |
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| subject | : | Environmental Sciences/Biodiversité et Ecologie Life Sciences/Biodiversity Life Sciences/Ecology, environment |
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| Key words: carbon mineralization — free-living N2-fixation — grasslands — microbial activity — N-cycling — N-mineralization |
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| halsde-00155959, version 1 | |
| http://hal-sde.archives-ouvertes.fr/halsde-00155959 | |
| oai:hal-sde.archives-ouvertes.fr:halsde-00155959 | |
| From: Christine Delorme | |
| Submitted on: Tuesday, 19 June 2007 15:31:20 | |
| Updated on: Tuesday, 19 June 2007 15:38:58 | |
