沉积物衍生的碳转移到水生植物中,用于C生物圈评估
Soroush Majlesi1,2, Safi Ullah3, Zahra Shirani3
1Department of Chemistry, Radiochemistry, University of Helsinki, P.O. Box 55 (A. I. Virtasen aukio 1), Helsinki, 00014, Finland. soroush.majlesi@helsinki.fi.
Radiation and environmental biophysics
|February 5, 2026
概括
来自核活动的碳-14 (C) 可以进入水生生态系统. 这项研究表明,像Lemna minor这样的自由浮动植物包含了最多的沉积碳,尽管总体吸收仍然很低.
科学领域:
- 环境科学 环境科学
- 放射化学 放射化学是指辐射化学.
- 水生生态学 水生生态学
背景情况:
- 碳-14 (C) 是核设施释放的显著放射性核化物,由于其移动性和长半衰期,对生物圈构成潜在威胁.
- 水生生态系统容易受到14C污染,可能被水生植物吸收,但这种纳入的程度尚不清楚.
研究的目的:
- 通过微观宇宙实验,研究水生植物从沉积物中吸收碳.
- 量化沉积物衍生的碳与水/空气来源对水生植物的贡献.
主要方法:
- 一个微观宇宙实验,利用古老的泥炭沉积物和富含水/空气来源之间的14C的天然同位素特征差异.
- 应用一个双池同位素混合模型来确定碳源贡献.
主要成果:
- 自由漂浮的Lemna minor表现出沉积物碳贡献最高 (高达60%),其次是沉浸的Littorella uniflora (15-17%) 和新兴物种 (高达10%).
- 总的来说,水生植物从沉积物中吸收的碳总量不到2%,无论来源的贡献如何.
- 浮动植物证明了水柱或空气中可用的沉积物衍生碳的更有效的吸收.
结论:
- 水生植物,特别是自由漂浮的物种,可以从沉积物中吸收碳,但沉积物衍生的碳的整体同化到植物生物质中是最小的.
- 浮动植物在水生生态系统内从沉积物中获得的碳转移中发挥着关键作用.
- 在物种内部,根和叶之间的沉积物衍生的碳转移并没有显著差异.
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