カルスト貯水池における溶存無機炭素動態と植物プランクトン群集遷移速度が生物ポンプに及ぼす複合的影響
Coupled effects of dissolved inorganic carbon dynamics and phytoplankton community succession rates on the biological carbon pump (BCP) in karst reservoirs (原題)
Jing Xiao, Baoli Wang, Wanzhu Li, Meiling Yang, Na Liu, Xiao-long Qiu
🤖 gxceed AI 要約
日本語
本研究は、烏江流域の11のカルスト貯水池を季節調査し、溶存無機炭素（DIC）動態と植物プランクトン群集遷移が生物炭素ポンプ（BCP）に与える影響を解析した。非珪藻類が優占する貯水池では群集遷移が速く、低CO₂条件下でHCO₃⁻利用による効率的な炭素固定がBCPを強化することを示した。水理負荷が低い貯水池では成層化が非珪藻類の成長を促し、BCP効果が高まる。これらの知見は、地球温暖化や富栄養化下での炭素源・吸収源機能の理解に貢献する。
English
This study surveyed 11 karst reservoirs in the Wujiang River Basin to analyze how dissolved inorganic carbon (DIC) dynamics and phytoplankton community succession affect the biological carbon pump (BCP). Reservoirs dominated by nondiatoms showed faster succession, and low CO₂ conditions favored efficient carbon fixation via HCO₃⁻ utilization, enhancing BCP. Low hydraulic load reservoirs with stratification promoted nondiatom growth and stronger BCP. Findings inform carbon source-sink functions under global warming and eutrophication.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本の貯水池や湖沼の炭素循環研究に示唆を与えるが、直接的なGX政策や開示実務への関連は限定的。気候変動適応や水圏生態系の炭素吸収源評価に関心のある研究者には参考になる。
In the global GX context
This paper contributes to understanding carbon dynamics in freshwater systems, relevant to global carbon cycle research and climate change mitigation. It offers insights for assessing carbon sinks in reservoirs, which could inform nature-based solutions and blue carbon accounting frameworks.
👥 読者別の含意
🔬研究者:Provides empirical evidence on how phytoplankton community dynamics regulate carbon pump efficiency in karst reservoirs, useful for carbon cycle modeling.
🏛政策担当者:May inform water resource management and carbon accounting for reservoir systems, but direct policy application is limited.
📄 Abstract（原文）
Karst reservoirs with high dissolved inorganic carbon (DIC) concentration exhibit an efficient biological carbon pump (BCP) effects driven by phytoplankton photosynthesis; however, the influence of phytoplankton community succession on BCP potential remains unclear. To address this issue, we conducted seasonal surveys across 11 karst reservoirs in the Wujiang River Basin and analyzed phytoplankton species composition, nutrients, DIC and its stable carbon isotopes (δ13CDIC). The results showed that reservoirs dominated by nondiatoms exhibited faster seasonal community succession rates, particularly those with algal bloom such as cyanobacteria or dinoflagellates. Environmental filtering-controlled phytoplankton community succession regulated the BCP, and this regulation was closely linked to dynamic changes in DIC speciation (e.g., CO₂(aq) and HCO₃⁻). Low CO₂(aq) favored nondiatoms with strong CO₂ concentrating mechanisms (CCMs), facilitating efficient carbon fixation through HCO₃⁻ utilization and enhancing primary productivity and BCP. Moreover, reservoirs with low hydraulic loads demonstrated pronounced seasonal vertical stratification, which promoted nondiatom growth and resulted in faster seasonal community succession rates and a stronger BCP effect than reservoirs with high hydraulic loads and were dominated by diatoms year-round. These findings indicate that phytoplankton community succession rate under the influence of DIC dynamic as a key regulator of BCP in karst reservoirs, informing their carbon source-sink functions in the context of global warming and eutrophication causing changes in biological communities.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.ecolind.2026.115392first seen 2026-08-31 05:01:24
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