Ecological half-life of ¹³⁷Cs in plants associated with a contaminated stream

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• 作者：Peles ; John D. ; Smith ; Michael H. ; Lehr Brisbin Jr ; I.
• 关键词：Ecological half-life ; Long-term decline ; Radiocesium ; Vegetation ; Primary producers
• 刊名：Journal of Environmental Radioactivity
• 出版年：2002
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：2002
• 卷：59
• 期：2
• 页码：169-178
• 文件大小：163 K

摘要

Ecological half-life (T_e) is a useful measure for studying the long-term decline of contaminants, such as radionuclides, in natural systems. The current investigation determined levels of radiocesium (¹³⁷Cs) in two aquatic (Polygonum punctatum, Sagittaria latifolia) and three terrestrial (Alnus serrulata, Myrica cerifera, Salix nigra) plant species from a contaminated stream and floodplain on the U.S. Department of Energy's Savannah River Site. Current ¹³⁷Cs levels in plants were used in conjunction with historical data to determine T_e of ¹³⁷Cs in each species. Median concentrations of ¹³⁷Cs were highest in S. latifolia (0.84Bqg⁻¹) and lowest in M. cerifera (0.10Bqg⁻¹). T_e's ranged from 4.85yr in M. cerifera to 8.35yr in S. nigra, both terrestrial species. T_e's for all aquatic (6.30yr) and all terrestrial (5.87) species combined were very similar. The T_e's of the two aquatic primary producers (P. punctatum and S. latifolia) in the Steel Creek ecosystem were somewhat longer than T_e values previously reported for some consumers from this ecosystem.