Scholarlink

<p>Among the released radionuclides from nuclear power plants and radioactive waste repositories, <sup>14</sup>C is of great importance. Continuous discharges of <sup>14</sup>C from nuclear industries, the risk of uncontrolled releases, and possible leaking from facilities may cause a threat to the biosphere. Because of high mobility and a long half-life of <sup>14</sup>C, it has great potential to be released into aquatic ecosystems and to be assimilated by aquatic plants. However, the amount of <sup>14</sup>C incorporated into organic matter and hydrophytes is largely unknown. In this study, the uptake of carbon from sediment into aquatic plants was investigated in a microcosm experiment. The study was carried out based on the natural difference in the isotopic signature of <sup>14</sup>C between the 8000-year-old peat and more enriched sources (water and atmosphere). The two-pool isotope mixing model was applied to determine the relative contribution of each source (sediment vs. air/water) to the hydrophytes. The results indicated the highest contribution of sediment-derived carbon to the free-floating <i>Lemna minor</i> (up to 60%), followed by submerged <i>Littorella uniflora</i> (15–17%) and the emergent species, <i>Stachys palustris</i> and <i>Lysimachia nummularia</i> (up to 10%). Despite the contribution of sediment-derived C to their C source, the hydrophytes incorporated less than 2% of their total C from sediment. The results also indicated the importance of floating plants in more efficient uptake of sediment-derived C available in water column or the air. Furthermore, no significant difference was found in the transfer of sediment-derived C between the roots and the leaves within the species.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Transfer of sediment-derived carbon into aquatic plants for 14C biosphere assessment

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月5日

查看全文
  • Soroush Majlesi,
  • Safi Ullah,
  • Zahra Shirani,
  • Jukka Pumpanen,
  • Susanna Salminen-Paatero,
  • Jarkko Akkanen,
  • Ari T. K. Ikonen

摘要

Among the released radionuclides from nuclear power plants and radioactive waste repositories, 14C is of great importance. Continuous discharges of 14C from nuclear industries, the risk of uncontrolled releases, and possible leaking from facilities may cause a threat to the biosphere. Because of high mobility and a long half-life of 14C, it has great potential to be released into aquatic ecosystems and to be assimilated by aquatic plants. However, the amount of 14C incorporated into organic matter and hydrophytes is largely unknown. In this study, the uptake of carbon from sediment into aquatic plants was investigated in a microcosm experiment. The study was carried out based on the natural difference in the isotopic signature of 14C between the 8000-year-old peat and more enriched sources (water and atmosphere). The two-pool isotope mixing model was applied to determine the relative contribution of each source (sediment vs. air/water) to the hydrophytes. The results indicated the highest contribution of sediment-derived carbon to the free-floating Lemna minor (up to 60%), followed by submerged Littorella uniflora (15–17%) and the emergent species, Stachys palustris and Lysimachia nummularia (up to 10%). Despite the contribution of sediment-derived C to their C source, the hydrophytes incorporated less than 2% of their total C from sediment. The results also indicated the importance of floating plants in more efficient uptake of sediment-derived C available in water column or the air. Furthermore, no significant difference was found in the transfer of sediment-derived C between the roots and the leaves within the species.