The impact of bacteria, plants and trees on accumulations and fractionations of rare earth elements at the atmosphere-soil-water-interface
Data of laboratory experiments with and without bacteria and plants are compared with data of trees (beech, spruce) from a natural forested catchment. Bacteria support the trace element uptake by plains. Plants are enriched with light rare earth elements (LREE) and Eu. These enrichments, however, are not bacteria induced but caused by plants metabolism. The process of LREE enrichment in plants and trees causes LREE depletion in catchment waters. Litter layers below beech are strongly enriched com pared to trees (100 times) but not much fractionated. Litter decomposition and high water storm events allow the removal of LREE enriched colloidal and dissolved organic matter by surface waters. These surface waters reach the streamlet and may cause instantaneoualy LREE enrichments in stream waters. Soil horizons just below the litter layer at 5 to 10cm depth are rich in Fe and Mn oxides. Bacteria probably caused their precipitation. The oxides are important sinks for REE. Isotope data as well as REE distribution patterns indicate that they derived from decomposed organic matter in the litter layer and the atmosphere.
plants bacteria water soil bioalteration forested catchment waste glass rare earth elements Pb-Sr-Nd-iso-topes
P. Stille J. L. Crovisier M. C. Pierret G. Aouad F. Gauthier-Lafaye F. Chabaux
Ecole et Observatoire des Sciences de la Terre, Centre de G ochimie de la Surface (CNRS, UMR7517)
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
30-31
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）