How aerobic and anaerobic microbial activities modify Se aqueous, gaseous and solid distribution in soils
Many redox transformations of selenium in soils can be mediated by microorganisms, either directly favouring reduction and volatilisation, or indirectly by affecting the chemical properties of the soil solution. The aims of this study were to determine the effects of microbial activities on Se distribution between the gaseous, liquid and solid phases and to distinguish between bacterial and fungal contributions to Se transformations. Aerobic incubations were performed with soil samples, some of which had previously been sterilised and/or amended with glucose. A part of the amended soil samples were treated with either a bactericide or a fungicide. The distribution of selenium was determined by analysing Se-75 in the aqueous, solid and gaseous phases. Abiotic in teractions between soil particles and selenite occurred mainly in the first hour of incubation and led to the immobilisation of 50％ of the applied selenium Bacterial activities increased the amount of selenium retained by the soil up to 95％. Both bacteria and fungi appeared to contribute to the volatilisation of Se. However, fungi alone produced 8-fold more volatile selenium than bacteria alone. When only bacteria were present, the amount of volatilised selenium was the same as when bacteria and fungi were present.
selenium soil solid-liquid distribution volatilisation bacteria fungi
O. Darcheville L. F vrier A. Martin-Garin P. Renault
IRSN-DEI/SECRE/LRE Bat 186, CE Cadarache, BP 3, 13115 St Paul-lez-Durance Cedex, France INRA UMR Climat Sol et Environnement Site Agroparc 84914 Avignon Cedex 9, France
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
390-391
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）