Selenium phytoextraction, speciation and microbial groups in Se-contaminated soils

摘要：

Phytoextraction of selenium (Se) was studied in Indian mustard (IM), fodder radish (FR) and alfalfa cultures, grown in soils ar-tificially contaminated with selenite or selenat. In a pot experiment, IM and FR plant shoots accumulated one order of magnitude less selenium from selenite than from selenate- treated (2. 5 mg·kg<1> ) brown forest soil. 40％-50％ of total Se in plants was ac-cumulated in the shoots, where Se concentrations reached 657μg·g<1> (IM) or 745μg·g<1> (FR). In case of selenate treatment selenate was the dominant Se form in the leaves, while 45％ (IM) or 23％ (FR) was present in organic form (selenomethionine and selenocisteine). In an open-field experiment (Nagyhorcsok, Hungary) from a calcareous chemozem treated 14 years before with a single, massive application of 30-810 kg·ha<- 1> Se (as selenite) in spite of the considerable downward migration (leac-hing) of Se-alfalfa shoots accumulated 85. 3- 727μg·g<1> Se. This can be explained by oxidation of selenite to selenate in the soil. In Se-ontaminated soils we have not found microbial species (except Pseudomonas and Bacillus sp. ), which could directly affect the Se phytoextraction and/or phytovolatization rate of plants.

关键词： contaminated soils microbes phytoextraction selenium speciation

作者: L. Simon E. Szeles S. Balazsy B. Biro

作者单位: College of Nyiregyhaza, Department of Land and Environmental Management University of Debrecen, Centre of Agricultural Sciences, Department of Food Science and Technology, College of Nyiregyhaza, Institute of Biology, H-4401 Nyiregyhaza Research Institute for Soil Science and Agricultural Chemistry of the Hungarian Academy of Sciences,

会议类型: 国际会议

会议名称: 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)

会议地点: 北京

会议语种:英文

页码: 554-555

在线出版日期: 2007-07-15（万方平台首次上网日期，不代表论文的发表时间）