从长期微生物降解的角度来看,在沿海海洋中沉没的大藻类的命运和碳封存潜力
Hongmei Li1, Zenghu Zhang1, Jing Chen2
1Qingdao New Energy Shandong Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
National science review
|August 22, 2025
概括
每年沉没的数百万大藻类可以封存大量的碳. 这项研究表明沉没的大藻生物质在海洋中转化为稳定的有机和无机碳形式.
科学领域:
- 海洋生物学
- 海洋学
- 生物地质化学
背景情况:
- 大规模藻的自然沉没发生在沿海海洋中,每年有数百万的藻在绿色潮之后沉没在黄海中.
- 沉没的大藻类的最终命运和碳封存潜力仍然不太清楚,尽管微生物群落在分解中发挥着至关重要的作用.
研究的目的:
- 通过模拟微生物降解,研究沉没的大藻生物质的命运及其碳封存潜力.
- 阐明在沉没的大藻中驱动碳转化和储存的微生物机制.
主要方法:
- 使用Ulva prolifera进行为期2年的模拟微生物降解实验.
- 将碳转化为各种形式的分析 (溶解的无机二碳酸盐,反抗性有机碳,碎片).
- 基因组分析以确定微生物群落及其功能作用.
主要成果:
- 沉没的大藻生物质中约有38%的碳最终被隔离.
- 10%的碳被转化为溶解的无机二碳酸盐,增强性和无机碳储存.
- 28%的保留碳转化为反的溶解/颗粒的有机碳和富含稳定化合物的藻类碎片.
- 由微生物碳和性介导的从r-战略家到K战略家的微生物继承推动了这些转变.
结论:
- 大规模沉没的Ulva prolifera具有长期海洋碳封存的巨大潜力.
- 沉没的大藻类对有机和无机形式的稳定碳池有所贡献.
- 微生物过程是从沉没的藻中捕获碳的关键驱动因素.
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