<br>巨藻生长过程中释放的颗粒有机碳在海洋中具有显着的碳封存潜力,Environmental Science & Technology

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巨藻生长过程中释放的颗粒有机碳在海洋中具有显着的碳封存潜力
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-11-14 , DOI: 10.1021/acs.est.3c04959
Hongmei Li _{1,

2,

3,

4} , Xiuting Feng _{1,

3} , Tianqi Xiong ₁ , Wei Shao ₁ , Wangchi Wu ₅ , Yongyu Zhang _{1,

2,

3,

4}

Affiliation

大型藻类生长过程中会释放大量颗粒有机碳（POC）；然而，这些 POC 的命运及其碳封存效应仍不清楚。现场调查发现，在大型藻华期间，石莼导致地表以下海水中的 POC 显着增加。然而，实验室模拟显示，其中77.6%的POC很容易在短时间内被微生物降解，同时POC转化产生溶解有机碳（DOC）。经过3个月的时间，大型藻类释放的POC和POC转化的DOC的生物可利用成分被降解，剩下39.6%的抗生物降解物质由生物难降解的POC和生物难降解的DOC组成。然而，尽管生物难降解POC富含抗生物降解的腐殖质类成分，但生物难降解POC表现出比生物难降解DOC更高的光降解敏感性。生物难降解POC的光降解去除率（14.1%）是生物难降解DOC（1.2%）的10倍以上。最终，由大型藻类生长释放的 POC 的很大一部分（36.3％）在转化为顽固性 POC 和顽固性 DOC 后可能会进行长期碳封存，而这些源自大型藻类 POC 的惰性碳之前已被忽略，也应包括在内大型藻类固碳核算。

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Particulate Organic Carbon Released during Macroalgal Growth Has Significant Carbon Sequestration Potential in the Ocean

Substantial amounts of particulate organic carbon (POC) are released during macroalgal growth; however, the fate of these POCs and their carbon sequestration effects remain unclear. Here, field investigations found that Ulva prolifera caused a significant increase of POC in seawater below the surface during a macroalgal bloom. However, laboratory simulations revealed that 77.6% of these POC was easily degraded by microorganisms in a short period of time, concurrently resulting in the production of dissolved organic carbon (DOC) from POC transformation. Over a period of 3 months, the bioavailable components of macroalgae-released POC and POC-transformed DOC were degraded, leaving 39.6% of the antibiodegradable substances composed of biorecalcitrant POC and biorecalcitrant DOC. However, although the biorecalcitrant POC was rich in humic-like components resisting biodegradation, the biorecalcitrant POC exhibited greater sensitivity to photodegradation than biorecalcitrant DOC. The photodegradation removal rate of biorecalcitrant POC (14.1%) was more than 10 times that of biorecalcitrant DOC (1.2%). Ultimately, a substantial portion (36.3%) of the POC released by growing macroalgae could potentially perform long-term carbon sequestration after conversion to recalcitrant POC and recalcitrant DOC, and these inert carbons derived from macroalgal POC have been previously ignored and should also be included in macroalgal carbon sequestration accounting.

更新日期：2023-11-14

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