PhD on Agriculture and plant breeding, Mazandaran, Iran



Nitrification procedures could have a significant position in the performing of Western Australia natural ecosystem. It is instantly concerned in plant nitrogen defeats via learn and denitrification. This process suppression with pastureland is incorrectly comprehended. The study has been accomplished on the deep sand at Mingenew in the Northern Agricultural Region,WA. Nitrification amount has been specified yearly, perennial pastureland and tagasaste grasses cultivated in site. Nitrification and prohibition amounts have been estimated according to measures of NH_4-N,NO_3-N insix months. In natural situations, the nitrification amounts of ammonium-N (NH_4-N) have been fast from 80 to 97 percent in the season. Nitrification amounts under yearly, perennial pastureland and tagasaste plants have been 35 to 80 percent, 58 to 58 percent, and 30 to 75 percent orderly. There is a highly negative correlation i.e., R^2= -0.84 between biomass and nitrification amount, and a highly positive correlation among biomass and prohibition amount i.e., 0.74. These outcomes present that pastureland types could have significant effects for nitrogen cycling at the constant growing and individual density.


Abbadie, L. and Lensi, R. 1990. Carbon and nitrogen mineralization and denitrification in a humid savanna ofWestAfrica (Lamto Cote d‘ voir) Acta Ecologa, 11: 717-728.
Bate, G. C. 1981. Nitrogen cycling in savanna ecosystem. Terrestrial Nitrogen Cycle (ed. F. E. Clark and T. Rosswell) pp. 463-475. Ecological Bulletin 33. Swedish National Science Research Council, Stockholm.
Bock, E., Sundermeyer-Klinger, H. and Stackbrandt, E. 1983. New facultative lithoudotrophic nitrite-oxidizing bacteria. Archives ofMicrobiology, 136. 281-284.
Bock, E.,Koops, H. P. and Harms,H. 1989. Nitrifying bacteria autotrophic bacteria. pp. 80-96, Science Technology Publishers,MadisonWI,USA.
Degrange, V., Lisi, R. and Bardin, R. 1997. Active, size and structure of Nitrobacter community is affected by organic carbon and nitrite in a sterile soil. FEMS Microbiology Ecology, 24: 173-180.
De Rham, P. 1973. Researches sur la mineralization de L‘azote dans les sols des savannas de Lamto (Lamto Cote d‘ voir) Acta Ecologa, 10: 169-196.
Donaldson, J.M. and Henderson, G.S. 1990. Nitrification potential of secondary- succession upland oak forests. Soil Science Society of American Journal, 54: 892-902.
Hasson, A. and Wiley, T. 2008. Effect of soil organic carbon sequestration under pastures of Western Australia. Unpublished.
Hasson, A.M. Patterson, G., Wiley, T. and Parker, W. 2008. Nitrate leaching under pastures, DAFWA Report.
Hasson, A., Al Kassy, A.W. and Hussain, R. 1988. Inhibition of nitrification by gamma irradiance in soil under plastic house conditions. Soil Science & Plant Nutrition, 34(2): 215-219.
Hynes,R.J. 1986. Role of nitrification in ecosystem.MineralN in the plantsoil system. pp. 149-155. Academic Press, London.
Jordan, C.V., Todd, R.L. and Escalante 1979. Nitrogen conservation in a tropical forests. Oecologia, 39: 123-128.
Keeeney, D.R. 1986. Inhibition of nitrification in soil. Nitrification, Ed. J. Prosser, pp. 99-115, IRL Press, Oxford, UK/Washington, DC, USA.
Lata, J.C., Durand, J., Linsi, R. and Abbadie, L. 1999. Stable coexisting of contrasted nitrification status in a wet tropical savanna ecosystem. Functional Ecology, 13: 762-768.
Lata, J.C.,Guillaume,K.,Degrange,V. and Abbadie,L. and Linsi,R. 2000. Relationship between root density of Africa grass Hyparrhenia diplandara and nitrification in decimetric scale: An inhibition stimulation balance hypothesis. Proceeding of the Royal Society of London, Series B, Biology Sciences, 267: 1-6.
Lensi, R. and Domach, A. M. and Abbadie, L. 1992. Field study of nitrification and denitrification in a wet savanna ofWestAfrica (Lamto Cote d‘ voir). Plant and Soil, 147: 107-113.
Lodhi, M.A.K. 1978. Comparative inhibition of nitrifiers and nitrification in a forest community as a result of the allelopathic nature of various trees species. American Journal of Botany, 65: 1135-1137.
McCary, G.W., Bremner, J.M. and Schmidt, E.L. 1991. Effect of phenolic acid on ammonia oxidation by terrestrial autotrophic nitrifying microorganisms. FEMS Microbiology Ecology, 85: 345-349.
Mieklejohn, J. 1968. Munber of nitrifying bacteria in some of Rhodesian soils under natural grass improved pastures. Journal of Applied Ecology, 5: 291-300.
Munro, P. E. 1966. Inhibition of nitrite-oxidizers by root grass. Journal of Ecology, 3: 227-229.
Purchase, B.S. 1974. Evaluation of the claim that grass root exudates inhibit nitrification. Plant and Soil, 41: 527-539.
Rice, E.L. and Pancholy, S.K. 1972. Inhibition of nitrification by climax ecosystems. American Journal of Botany, 59: 1033-1040.
Robertson, G.P. 1984. Nitrification and nitrogen mineralization in a lowland rain forest succession in Costa Rica, CentralAmerica.Oecologia, 61: 99-104.
Robertson, G.P. 1987. Nitrification and denitrification in a humid tropical ecosystem: Potential control on nitrogen retention: In: Mineral Nutrients in Tropical Forest and Savanna Ecosystems (ed. J. Proctor), pp. 55-69. British Ecological Society Special Publication No. 9.,Blackwell Science, Oxford, UK.
SAS Institute 1989. SAS/STAT User’s Guide. SAS Inst.,Cary, NY. Searle, P.L. 1984. Analysis Methods, 109: 549-568.
Serca, D., Demas, R. and Le Roux, X. 1998. Comparison of nitrogen monoxides emissions from several African tropical ecosystems and influence of season and fire. Global Biogeochemical Cycle, 12: 637-651.
Stienstra, A., Klein, W., Gunnewiek, P.P. and Laanbroek, H.J. 1994. Repression of nitrification in soil under a climax grasslands vegetation. FEMS Microbiology Ecology, 14: 45-52.
Stiven, G. 1952. Production of antibiotic substances by the root of a grass (Trachypogon plumosus H.B.K. Nees) and Pentanesia variabilis (E. Mey.) Harv. (Rubiaceae). Nature, 170: 712-713.
Verstraete, P.M. 1981. Nitrification. In: Terrestrial Nitrogen Cycle (ed. F. F. Clark & T. Rosswell), pp. 303-314. Ecological Bullitin, 33, Swedish National Science Research Council, Stockholm.
Vitousek, P.M., Gosz, J.R., Grier, C.C., Mellilo, J.M., Rieners, W.A. and  Toddel, R.I. 1979.Nitrates losses fromdisturbed ecosystems. Science, 204: 469-474.