J. Abadín, S. J. González-prieto, and T. Carballas, Relationships among main soil properties and three N availability indices, Plant and Soil, vol.34, issue.5, pp.193-208, 2010.
DOI : 10.1007/s11104-010-0568-y

L. Abbadie and J. Lata, Nitrogen Dynamics in the Soil-Plant System, p.417, 2006.
DOI : 10.1007/978-0-387-33857-6_15

URL : https://hal.archives-ouvertes.fr/bioemco-00353830

L. Abbadie, A. Mariotti, and J. Menaut, Independence of Savanna Grasses from Soil Organic Matter for Their Nitrogen Supply, Ecology, vol.73, issue.2, pp.608-613, 1992.
DOI : 10.2307/1940766

S. A. Macko, Nitrogen isotope composition of soils, C-3 and C-4 plants along 423 land use gradients in southern Africa, Journal of Arid Environments, vol.72, pp.326-337, 2008.

R. D. Bardgett and D. A. Wardle, HERBIVORE-MEDIATED LINKAGES BETWEEN ABOVEGROUND AND BELOWGROUND COMMUNITIES, Ecology, vol.84, issue.9, pp.2258-2268, 2003.
DOI : 10.1034/j.1600-0706.2000.890102.x

A. J. Belsky and D. M. Blumenthal, Effects of Livestock Grazing on Stand Dynamics and Soils in Upland Forests of the Interior West. Efectos del Pastoreo sobre la Dinamica de Arboles y Suelos en Bosques en el Altiplano del Occidente Interior, Conservation Biology, vol.11, issue.2, pp.315-327, 1997.
DOI : 10.1046/j.1523-1739.1997.95405.x

A. Bilgo, D. Masse, S. Sall, G. Serpantié, J. L. Chotte et al., Chemical and 429 microbial properties of semiarid tropical soils of short-term fallows in Burkina Faso, p.430, 2006.

S. Boudsocq, J. C. Lata, J. Mathieu, L. Abbadie, and S. Barot, Modelling approach to 432 analyze the effects of nitrification inhibition on primary production, pp.220-230, 2009.

T. W. Boutton, S. R. Archer, A. J. Midwood, S. F. Zitzer, and R. Bol, ??13C values of soil organic carbon and their use in documenting vegetation change in a subtropical savanna ecosystem, Geoderma, vol.82, issue.1-3, pp.5-41, 1998.
DOI : 10.1016/S0016-7061(97)00095-5

I. C. Burke, W. A. Reiners, and D. S. Schimel, Plant-soil interactions in temperate 439 grasslands, Biogeochemistry, vol.42, issue.1/2, pp.121-143, 1998.
DOI : 10.1023/A:1005987807596

J. César, L'influence de l'exploitation sur la pérennité des pâturages de savane II, 1989.

K. S. Chapman, J. A. Langley, S. C. Hart, and G. W. Koch, Plants actively control nitrogen cycling: uncorking the microbial bottleneck, New Phytologist, vol.62, issue.1, pp.27-34, 2006.
DOI : 10.1007/PL00008860

J. M. Craine, Resource strategies of wild plants, p.445, 2009.
DOI : 10.1515/9781400830640

R. A. Welker, J. M. Wright, and I. J. , Global patterns of foliar nitrogen isotopes and 453 their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and 454 nitrogen availability, New Phytologist, vol.183, pp.980-992, 2009.

J. M. Craine, W. G. Lee, W. J. Bond, R. J. Williams, and L. C. Johnson, ENVIRONMENTAL CONSTRAINTS ON A GLOBAL RELATIONSHIP AMONG LEAF AND ROOT TRAITS OF GRASSES, Ecology, vol.86, issue.1, pp.12-19, 2005.
DOI : 10.1034/j.1600-0706.2000.910104.x

S. K. Danso, I. G. Hardarson, and F. Zapata, Misconceptions and practical problems in 462 the use of 15 N soil enrichment techniques for estimating N 2 fixation, Plant and Soil, vol.463, pp.152-177, 1993.

C. De-mazancourt, M. Loreau, and L. Abbadie, GRAZING OPTIMIZATION AND NUTRIENT CYCLING: WHEN DO HERBIVORES ENHANCE PLANT PRODUCTION?, Ecology, vol.79, issue.7, pp.2242-2252, 1998.
DOI : 10.1126/science.1273598

J. D. Derner, D. D. Briske, and T. W. Boutton, Does grazing mediate soil carbon and 467 nitrogen accumulation beneath C 4 , perennial grasses along an environmental gradient? 468 Plant and Soil 191, pp.147-156, 1997.

P. Dijkstra, C. M. Laviolette, J. S. Coyle, R. R. Doucett, E. Schwartz et al., N enrichment as an integrator of the effects of C and N on microbial metabolism and ecosystem function, Ecology Letters, vol.52, issue.4, pp.389-397, 2008.
DOI : 10.1016/j.tree.2006.04.002

K. Minamisawa, Endophytic colonization and in planta, p.474, 2001.

D. A. Frank and R. D. Evans, Effects of native grazers on grassland, p.477, 1997.

D. A. Frank, P. M. Groffman, R. D. Evans, and B. F. Tracy, Ungulate stimulation of nitrogen cycling and retention in Yellowstone Park grasslands, Oecologia, vol.123, issue.1, pp.116-480, 2000.
DOI : 10.1007/s004420050996

E. Garnier and S. Vancaeyzeele, Carbon and nitrogen content of congeneric annual and perennial grass species: relationships with growth, Plant, Cell and Environment, vol.72, issue.4, pp.399-483, 1994.
DOI : 10.1007/BF00317120

J. Gignoux, P. Mordelet, and J. Menaut, Biomass Cycle and Primary Production, p.485, 2006.
DOI : 10.1007/978-0-387-33857-6_7

URL : https://hal.archives-ouvertes.fr/bioemco-00175288

J. P. Grime, Evidence for the Existence of Three Primary Strategies in Plants and Its Relevance to Ecological and Evolutionary Theory, The American Naturalist, vol.111, issue.982, pp.1169-1194, 1977.
DOI : 10.1086/283244

J. P. Grime, Plant strategies, vegetation processes, and ecosystem properties, p.490, 2001.

S. E. Hobbie, Effects of plant species on nutrient cycling, Trends in Ecology & Evolution, vol.7, issue.10, p.492, 1992.
DOI : 10.1016/0169-5347(92)90126-V

R. B. Jackson and M. M. Caldwell, Geostatistical Patterns of Soil Heterogeneity Around Individual Perennial Plants, The Journal of Ecology, vol.81, issue.4, pp.683-692, 1993.
DOI : 10.2307/2261666

R. Joffre, Plant and soil nitrogen dynamics in mediterranean grasslands: a comparison of annual and perennial grasses, Oecologia, vol.61, issue.1, pp.142-149, 1990.
DOI : 10.1007/BF00317355

A. Kahmen, W. Wanek, and N. Buchmann, Foliar ??15N values characterize soil N cycling and reflect nitrate or ammonium preference of plants along a temperate grassland gradient, Oecologia, vol.13, issue.4, pp.861-870, 2008.
DOI : 10.1007/s00442-008-1028-8

J. M. Knops, K. L. Bradley, and D. A. Wedin, Mechanisms of plant species impacts on ecosystem nitrogen cycling, Ecology Letters, vol.81, issue.3, pp.454-466, 2002.
DOI : 10.1126/science.274.5293.1720

M. Kriszan, W. Amelung, J. Schellberg, T. Gebbing, and W. Kühbauch, Long-term changes of the ??15N natural abundance of plants and soil in a temperate grassland, Plant and Soil, vol.4, issue.1-2, pp.157-169, 2009.
DOI : 10.1007/s11104-009-9965-5

J. Lata, V. Degrange, X. Raynaud, P. Maron, R. Lensi et al., Grass populations control nitrification in savanna soils, Functional Ecology, vol.84, issue.4, pp.605-611, 2004.
DOI : 10.1016/0168-6496(94)90080-9

URL : https://hal.archives-ouvertes.fr/bioemco-00139318

J. Lata, J. Durand, R. Lensi, and L. Abbadie, Stable coexistence of contrasted nitrification statuses in a wet tropical savanna ecosystem, Functional Ecology, vol.88, issue.6, pp.762-509, 1999.
DOI : 10.1016/0378-1127(91)90195-2

URL : https://hal.archives-ouvertes.fr/bioemco-00353154

A. Mariotti, J. C. Germon, P. Hubert, P. Kaiser, R. Letolle et al., Experimental determination of nitrogen kinetic isotope fractionation: Some principles; illustration for the denitrification and nitrification processes, Plant and Soil, vol.61, issue.9, pp.62-413, 1981.
DOI : 10.1021/j150551a007

H. B. Nacro, M. Larré-larrouy, A. Mariotti, C. Feller, and L. Abbadie, Natural 515 nitrogen-15 abundance and carbohydrate content and composition of organic matter 516 particle-size fractions from a sandy soil, pp.171-177, 2004.

K. Nadelhoffer, G. Shaver, B. Fry, G. Giblin, L. Johnson et al., 15N natural abundances and N use by tundra plants, Oecologia, vol.1, issue.3, pp.386-394, 1996.
DOI : 10.1007/BF00328456

S. J. Mcnaughton, F. F. Banykwa, and M. M. Mcnaughton, Promotion of the Cycling of Diet-Enhancing Nutrients by African Grazers, Science, vol.278, issue.5344, pp.1798-1800, 1997.
DOI : 10.1126/science.278.5344.1798

D. Robinson, ? 15 N as an integrator of the nitrogen cycle. Trends in Ecology and 529, Evolution, vol.16, pp.153-162, 2001.

N. Rossignol, A. Bonis, and J. Bouzillé, Consequence of grazing pattern and vegetation structure on the spatial variations of net N mineralisation in a wet grassland, Applied Soil Ecology, vol.31, issue.1-2, pp.62-72, 2006.
DOI : 10.1016/j.apsoil.2005.04.004

URL : https://hal.archives-ouvertes.fr/hal-00015027

N. A. Somé, Les systèmes écologiques post-culturaux de la zone soudanienne, 1996.

. Faso, structure spatio-temporelle des communautés végétales et évolution des 535 caractères pédologiques, Paris VI), p.536

P. L. Staddon, Carbon isotopes in functional soil ecology. Trends in ecology & 537 evolution 19, pp.148-154, 2004.

W. L. Berry, Biological nitrification inhibition (BNI)-is it a widespread 540 phenomenon?, Plant and Soil, vol.294, pp.5-18, 2007.

G. V. Subbarao, H. Y. Wang, O. Ito, K. Nakahara, and W. L. Berry, NH 4 + triggers the synthesis and release of biological nitrification inhibition compounds in Brachiaria humidicola roots, Plant and Soil, vol.117, issue.1-2, pp.245-257, 2007.
DOI : 10.1007/s11104-006-9156-6

P. H. Templer, G. M. Lovett, K. C. Weathers, S. E. Findlay, and T. E. Dawson, Influence of 548 tree species on forest nitrogen retenton in the Catskill mountains, Ecosystems, vol.8, pp.549-550, 2005.

P. H. Templer, W. L. Silver, J. Pett-ridge, K. M. Deangelis, and M. K. Firestone, Plant 551 and microbial controls on nitrogen retention and loss in a humid tropical forest, Ecology, vol.89, pp.552-3030, 2008.

M. A. Vinton and I. C. Burke, Interactions Between Individual Plant Species and Soil Nutrient Status in Shortgrass Steppe, Ecology, vol.76, issue.4, pp.1116-1133, 1995.
DOI : 10.2307/1940920

L. Wang, P. Odorico, L. Ries, and S. A. Macko, Patterns and implications of plant-soil 556, 2010.

D. A. Wardle, G. M. Barker, G. W. Yeates, K. I. Bonner, and A. Ghani, Introduced 558 browsing mammals in New Zealand natural forests: aboveground and belowground 559 consequences, Ecological Monographs, vol.74, pp.587-614, 2001.