在宏藻生长过程中释放的有机颗粒碳在海洋中具有显著的碳封存潜力
Hongmei Li1,2,3,4, Xiuting Feng1,3, Tianqi Xiong1
1CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
Environmental science & technology
|November 14, 2023
概括
大藻类的开花会释放有机碳颗粒 (POC). 虽然大量的POC降解,但很大一部分成为反抗性碳,从而导致长期的碳捕获.
科学领域:
- 海洋生物学 海洋生物学
- 生物地质化学生物地质化学
- 海洋学 海洋学 海洋学
背景情况:
- 宏观藻类的开花会释放出大量的有机颗粒碳 (POC).
- 人们对宏POC的最终命运和碳捕集潜力仍然不太了解.
- 以前的评估可能忽视了宏衍生碳的长期封存能力.
研究的目的:
- 调查大藻释放的POC的转化和命运.
- 量化宏藻POC对长期碳封存的贡献.
- 评估生物降解和光降解在POC命运中的作用.
主要方法:
- 在宏藻繁殖期间对POC增加的现场观测.
- 实验室模拟以评估微生物对POC的降解.
- 在光降解条件下对生物热剂POC和溶解有机碳 (DOC) 的分析.
主要成果:
- 微生物降解迅速消耗了77.6%的宏POC,产生DOC.
- 3个月后,39.6%的初始POC仍然是生物缩剂形式 (POC和DOC).
- 生物化剂POC的光降解率高于生物化剂DOC,POC的去除率为14.1%,而DOC的1.2%.
结论:
- 大量的 (36.3%) 宏POC可以成为反抗性,有助于长期碳封存.
- 来自大藻类的固的POC和DOC是碳捕获的重要,以前被忽视的组成部分.
- 宏观藻类的碳捕集潜力需要纳入这些惰性碳池.
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