地中海浅海湾内巨藻森林在蓝色碳储存中的作用
Uxue Moreda1, Inés Mazarrasa2, Emma Cebrian1
1Centre d'Estudis Avançats de Blanes, Consejo Superior de Investigaciones Científicas (CEAB-CSIC), Blanes, Spain.
The Science of the total environment
|May 16, 2024
概括
海藻森林在地中海沿海沉积物中捕获了大量的有机碳 (Corg),与海草生态系统相似. 这项研究支持将大藻类纳入蓝色碳计划,因为它们具有长期碳储存能力.
科学领域:
- 海洋生态海洋生态学
- 蓝碳研究 蓝碳研究
- 生物地质化学生物地质化学
背景情况:
- 海藻是高度生产力的全球息地,但它们在蓝色碳框架中的作用仍在开发中.
- 由于基质类型和出口,在海藻息地中证明长期有机碳 (Corg) 储存存在挑战.
- 宏观藻类对沉积式Corg储存的贡献需要进一步调查蓝碳会计.
研究的目的:
- 调查地中海大藻林和相邻息地中Corg沉积物储存的情况.
- 量化Corg埋葬率并评估有机碳的来源.
- 提供关于将大藻类纳入蓝碳框架的证据.
主要方法:
- 在宏藻 (Gongolaria barbata),海草 (Cymodocea nodosa) 和混合藻类 (Caulerpa prolifera) 草地和赤裸裸的沙中研究了沉积体Corg.
- 分析了30厘米顶部的沉积物,以了解谷粒大小,Corg含量和Corg埋葬率 (自1950年以来).
- 使用稳定的碳同位素 (δ13Corg) 和热解来确定Corg的来源和组成.
主要成果:
- 宏观藻类森林呈现出与已建立的蓝碳生态系统相比较的Corg种群和埋葬率 (15.5 g Corg m-2 y-1).
- Cymodocea nodosa是沉积Corg的主要贡献者 (36%),但大藻 (G. barbata和C. prolifera) 的贡献很大 (49%).
- 分析性热解证实了沉积物中的宏藻衍生化合物,表明对Corg种群的直接贡献.
结论:
- 地中海浅层沿海海域的宏观藻类森林封存了长期的宏观藻类衍生Corg (大约. 70年) 的时间.
- 与大藻相关的沉积式Corg埋葬率在5.4至9.5g Corg m-2 y-1.1之间.
- 经验证据支持将大藻类纳入蓝碳框架以缓解气候变化.
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