忽视了持续的藻类-细菌相互作用在海洋反弹性碳封存中的重要作用及其对海洋变暖的反应
Hanshuang Zhao1,2,3, Zenghu Zhang1,2,3, Shailesh Nair1,2,3
1Qingdao New Energy Shandong Laboratory, Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China.
Global change biology
|November 27, 2024
概括
海洋藻类和细菌产生反复性溶解有机碳 (RDOC),对气候调节至关重要. 然而,不断变暖的海洋减少了这种重要的碳捕获,威胁到气候稳定.
科学领域:
- 海洋微生物生态学
- 生物地质化学生物地质化学
- 气候科学是气候科学.
背景情况:
- 海洋溶解有机碳 (DOC) 在长期碳封存中发挥着关键作用.
- 反应性溶解有机碳 (RDOC) 的形成是由藻类和细菌之间的相互作用驱动的.
- 这些相互作用对RDOC积累和海洋碳捕获的长期影响仍然不太清楚.
研究的目的:
- 通过藻类-细菌相互作用来研究RDOC形成的长期动态.
- 量化直接藻类RDOC合成的贡献.
- 评估海洋变暖对RDOC水库和碳封存的影响.
主要方法:
- 使用长期 (720天) 赛内可可克菌-细菌模型系统.
- 测量了随着时间的推移的DOC度和DOC惰性.
- 分析了RDOC的分子组成,并确定了遗传/代谢物标记.
- 模拟了海洋变暖对系统的影响 (+4°C).
主要成果:
- 该模型系统累积了高的DOC度 (高达84毫克L-1),惰性增加 (>50%的RDOC比率).
- 来自Synechococcus-细菌的RDOC分子类似于在公海中发现的RDOC分子.
- 赛内可可可直接合成并释放RDOC,对海洋的RDOC池贡献约0.21 Gt y-1.
- 海洋变暖增强了微生物生长和DOC释放,但破坏了稳定和减少了RDOC储存.
结论:
- 长期的藻类-细菌相互作用对海洋RDOC形成和碳捕获有显著的贡献.
- 赛内可可可是以前被低估的海洋RDOC的直接来源.
- 海洋变暖对海洋的碳捕集能力构成重大威胁,因为它减少了RDOC的储量.
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