Redox condition and nitrate change in a newly flooded rice soil under percolation as influenced by oxidative iron and manganese(Soil chemistry and soil mineralogy)

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概要

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• Nitrate leaching from intermittently flooded rice fields contributes to nitrate pollution in groundwater. In this study, redox conditions and nitrate change in a newly flooded rice soil under the influence of oxidative iron (Fe) and manganese (Mn) were investigated using flooded soil columns under moderate percolation (4.2mm d^<-1>). The amendments of α-Fe_2O_3 and β-MnO_2 powder (5 and 2.7mg g^<-1>, respectively) delayed the establishment of reducing conditions and lowered the rate of nitrate removal in the soil column, and subsequently increased the percolation of soil indigenous nitrate (8.3mg nitrogen [N] kg^<-1>) from 2.0% to 8.0%, and the percolation of externally amended nitrate (250mg N kg^<-1>) from 11.0% to 26.0%. The pool of oxidative iron-centered metal oxidants needs to be jointly considered with the availability of organic carbon and hydrological conditions in evaluating redox conditions and nitrate change in intermittently flooded rice soils.

著者

• Huang Bin

  State Key Laboratory Of Forest And Soil Ecology Institute Of Applied Ecology Chinese Academy Of Science:key Laboratory Of Pollution Ecology And Environmental Engineering Institute Of Applied Ecology Cas

• GAMBRELL Robert

  School of Coast and Environment, Louisiana State University

関連論文

• Redox condition and nitrate change in a newly flooded rice soil under percolation as influenced by oxidative iron and manganese(Soil chemistry and soil mineralogy)

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