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在 (亚) 深水库下沉时量化追踪内源颗粒有机碳的分解:使用放射性碳同位素 Δ14C

Chao Yin¹, Yan Zeng¹, Jingan Chen¹

¹State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550001, PR China; Guizhou Province Field Scientific Observation and Research Station of Hongfeng Lake Reservoir Ecosystem, Guiyang, 551499, PR China.

|December 22, 2024

概括

水库的扩张会影响碳循环. 这项研究量化了沉降过程中的微粒有机碳 (POC) 分解,发现显著的分解减少了沉积物中的碳埋葬.

科学领域:

环境科学环境科学
地质化学地质化学
临界技术临界技术

背景情况:

水库的扩张和温和化显著改变了区域和全球的碳循环.
准确评估水库的碳沉积潜力需要量化固体颗粒有机碳 (POC) 在颗粒物沉积过程中的分解.
气温上升和人类活动加剧了了解这些过程的需要.

研究的目的:

系统地探索 (次) 深水库内源性POC的来源和演变.
在洪峰水库中颗粒物沉降过程中量化内源性POC的分解.
评估内源性POC对水库中的碳池的贡献.

主要方法:

从流入的河流和水库中收集的颗粒物和水样.
分析的POC含量,POC的稳定同位素 (δ13C_POC),POC的放射性同位素 (Δ14C_POC),微粒和叶绿素度.
利用 Δ14C_POC 作为追踪POC来源和沉没过程中的分解的主要指标.

主要成果:

在河流和水库颗粒物之间发现了POC含量和碳同位素的显著差异,表明不同的来源.
从地表到底部水域的POC贡献减少了 (73-85%到41-57%).
大约74.7-75.4%的内源性POC在沉降过程中分解,最小的有机物质到达沉积层.

结论:

Δ14C_POC是追踪水库中POC命运的可靠指标.
内源性POC的很大一部分在沉降过程中分解,限制了其对沉积物碳埋葬的贡献.
需要对分解产品进行进一步的研究,以充分了解储水库的碳汇潜力.

关键词:

碳循环是一个碳循环.分解过程是分解过程.在 POC POC POC 中.储水池是一个水库.Δ(14c) 的情况.

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