Sedimentary carbon burial driven by the biological carbon pump: mechanistic insights into recalcitrant organic carbon in karst reservoirs
生物炭素ポンプによる堆積性炭素埋没：カルスト貯水池における難分解性有機炭素のメカニズム解明 (AI 翻訳)
Shijun Tu, Wanfa Wang, Sen Xu, Haijun Peng, Amit Kumar, Wenhong Shi, Luxue Wang, Dengming He, Xuan Hu, Aili Yang, Hong Wang, Si-Liang Li
🤖 gxceed AI 要約
日本語
本論文は、カルスト貯水池（宋白山貯水池）における生物炭素ポンプの強度が、自生有機炭素の蓄積と難分解性有機炭素の安定化に与える影響を解明した。熱成層が生物炭素ポンプを強化し、溶解性無機炭素の減少とδ13CDICの濃縮を引き起こした。自生有機炭素は堆積性有機炭素プールの65.8%を占め、高い有機炭素埋没率（89.5 g C m⁻² a⁻¹）を支えた。難分解性有機炭素が堆積性有機炭素の59.8%を占め、炭素隔離における主要な役割を果たしていることが示された。
English
This paper investigates how the intensity of the biological carbon pump regulates autochthonous organic carbon accumulation and recalcitrant organic carbon stabilization in a karst reservoir (Songbaishan Reservoir). Thermal stratification enhanced the biological carbon pump, leading to a drawdown of dissolved inorganic carbon and enrichment of δ13CDIC. Autochthonous organic carbon accounted for 65.8% of sedimentary organic carbon, supporting a high organic carbon burial rate of 89.5 g C m⁻² a⁻¹. Recalcitrant organic carbon constituted 59.8% of sedimentary organic carbon, playing a dominant role in carbon sequestration.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
In the global GX context
This paper provides mechanistic insights into carbon sequestration in karst reservoirs, which are significant carbon sinks. The findings contribute to understanding the global carbon cycle and potential for natural climate solutions, though direct application to corporate disclosure or transition finance is limited.
👥 読者別の含意
🔬研究者:This paper offers a detailed mechanism of organic carbon burial in karst reservoirs, useful for carbon cycle modeling and assessing natural carbon sinks.
📄 Abstract（原文）
How the intensity of biological carbon pump (BCP) regulates the accumulation of autochthonous organic carbon (AOC) and the stabilization of recalcitrant organic carbon (ROC) in reservoir sediments remains poorly understood. Here, we integrated stable carbon and nitrogen isotopes (δ13C and δ15N), organic carbon (OC) classification, and molecular fingerprinting to elucidate the sources and stabilization mechanisms of sedimentary OC in the Songbaishan Reservoir. Thermal stratification enhanced the BCP, resulting in a drawdown of dissolved inorganic carbon by 9.1 mg L−1 and concurrent enrichment of δ13CDIC by + 2.7‰ relative to inflowing rivers. This shift, driven by distinct nutrient (carbon-phosphorus) limitations, promoted substantial AOC production. The AOC accounted for 65.8 ± 12.1% of the sedimentary OC pool, supporting a high organic carbon burial rate (OCBR) of 89.5 g C m⁻2 a⁻1. Additionally, ROC constituted 59.8% of the sedimentary OC, indicating its dominant role in carbon sequestration. The enhanced OCBR in karst reservoirs is therefore primarily driven by the accumulation of sedimentary ROC, which constitutes the key mechanism ensuring efficient carbon sequestration. Consequently, we propose the ratio of ROC to total organic carbon as an effective and practical metric for evaluating a reservoir’s carbon sequestration capacity.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1007/s44246-026-00269-1first seen 2026-06-17 06:14:19 · last seen 2026-06-17 07:14:40
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