International Science Community Association International Research Journal of Environmental Sciences 2319-1414 7 12 2018 12 22 Phosphorus transformations in mangrove soils under microcosm study 21 35 EN Areola A.A. 1 Department of Geography, University of Ibadan, Nigeria Ikporukpo C.O. 2 Department of Geography, University of Ibadan, Nigeria Razafitsalama Falintsoa Fanantenana Asombola 1 National Institute of Nuclear Science and Technology (INSTN- Madagascar), P.O 3901Antananarivo-101, Madagascar Ranaivoson Ravo Tokiniaina 2 National Institute of Nuclear Science and Technology (INSTN- Madagascar), P.O 3901Antananarivo-101, Madagascar Rajaobelison Joël 3 National Institute of Nuclear Science and Technology (INSTN- Madagascar), P.O 3901Antananarivo-101, Madagascar and Mention Physics and Applications, Faculty of Sciences - University of Antananarivo, Madagascar Ramaroson Voahirana Ramaroson 4 National Institute of Nuclear Science and Technology (INSTN- Madagascar), P.O 3901Antananarivo-101, Madagascar and Mention Physics and Applications, Faculty of Sciences - University of Antananarivo, Madagascar Fareze Lahimamy Paul 5 National Institute of Nuclear Science and Technology (INSTN- Madagascar), P.O 3901Antananarivo-101, Madagascar Rakotomalala Christian Ulrich 6 National Institute of Nuclear Science and Technology (INSTN- Madagascar), P.O 3901Antananarivo-101, Madagascar Renuka R. 1 Department of Soil Science, Kerala Forest Research Institute, Thrissur, Kerala-680653, India Sandeep S. 2 Department of Soil Science, Kerala Forest Research Institute, Thrissur, Kerala-680653, India Sujatha M.P. 3 Department of Soil Science, Kerala Forest Research Institute, Thrissur, Kerala-680653, India > Research Paper 2018 8 21 2018 12 22 Various phosphorus (P) fractions in the mangrove soils were studied by incubation study (180days) to understand the biogeochemical cycling in the mangrove soils of Eastern coast of India. The soil was analysed using sequential extraction procedure. Total phosphorus were ranged from 18893 mg/kg and 3268 mg/kg and Org-P was the dominant fraction which contributed about 89.2% of total P. Ion bound phosphorus (Fe-P) was the most important fraction among the inorganic P forms may be because of Fe-oxide, sulphate reduction. The study suggested that speciation of phosphorous (P) had good correlation among themselves. In addition, the various P fractions were increased during incubation period and these pools in turn supplement the SP thereby maintaining a high amount of P in the mangrove soil. At surface soils the pH and Eh exhibited stable values during inundation and the Eh dropped significantly from 98 to -215.1 mV, concurrently with pH increase to basic values (6.2-8.1). These results indicate that influence of electro chemical properties on phosphorus geochemistry in mangrove soil. The study concluded that quantifying the relation between P fractions in mangrove soils is required to realize the mangrove ecosystem in connection with human intervention. Copyright@ International Science Community Association