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多种途径驱动沿海宏观藻类生态系统中的CH4和N2O排放
Hongmei Li1,2,3, Xiaojie Wang1,2, Yue Tian1,4
1Qingdao New Energy Shandong Laboratory, Shandong Energy Institute Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
Environmental science & technology
|March 13, 2026
概括
沿海大藻类,如Ulva prolifera,释放出大量的甲和氧化. 这些强大的温室气体通过藻类过程和微生物活动产生,影响气候评估.
科学领域:
- 海洋生态海洋生态学
- 生物地质化学生物地质化学
- 气候科学 气候科学
背景情况:
- 沿海宏观藻类生态系统以碳封存而闻名.
- 它们作为强大的温室气体,甲 (CH4) 和氧化 (N2O) 的来源的作用尚不清楚.
- 绿色潮,由Ulva prolifera主导,在黄海提供了一个独特的案例研究.
研究的目的:
- 调查来自宏生态系统的甲 (CH4) 和氧化 (N2O) 的排放情况,特别是在Ulva prolifera繁殖期间.
- 在不同的溶氧 (DO) 条件下阐明驱动CH4和N2O生产的机制和途径.
- 评估大藻类繁殖对非二氧化碳温室气体流量的贡献.
主要方法:
- 现场测量CH4和N2O度在表面水域,以Ulva prolifera为主.
- 实验室培养实验以研究藻类生长和衰变阶段的CH4释放动态.
- 同位素追踪实验以确定N2O生产的途径 (氨氧化和脱).
主要成果:
- 与非宏藻水相比,含有Ulva prolifera的水中CH4 (346%) 和N2O (147%) 度显著更高,即使DO水平高 (>6.0 mg/L).
- CH4的释放发生在两个阶段:藻类光合作用/生长过程中的ROS (DO>5.0 mg/L) 和衰变过程中的前体微生物降解的增加 (DO>4.0 mg/L).
- 在藻基质中的无氧微利基中发现了甲原体的古生物.
- N2O生产与生长过程中的氨氧化和脱有关,在衰变过程中随着气耗尽而减少.
结论:
- 沿海宏观藻类生态系统,特别是在开花期间,是甲 (CH4) 和氧化 (N2O) 的重要来源.
- 多种有氧途径有助于CH4和N2O排放,由藻类和微生物过程驱动.
- 在评估大藻类对气候的影响时,必须考虑这些以前未被识别的温室气体流与碳捕获一起.
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