Particulate organic carbon sedimentation triggers lagged methane emissions in a eutrophic reservoir

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2024-03-08 DOI:10.1002/lol2.10379
Andrés Martínez-García, Ignacio Peralta-Maraver, Eva Rodríguez-Velasco, Gema L. Batanero, Miriam García-Alguacil, Félix Picazo, Juan Calvo, Rafael Morales-Baquero, Francisco J. Rueda, Isabel Reche
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Abstract

Reservoirs act as carbon sinks when sedimentation of particulate organic carbon (POC) exceeds CO2 and CH4 emissions. Here, we study the poorly explored process where phytoplankton-derived acidic polysaccharides (APs) aggregate into particulate organic matter, promoting carbon export to sediments. This source of POC in sediments can mineralize to CO2 and CH4 over various timescales. Our research, centered on a Mediterranean reservoir, elucidates phenological trends of APs and POC sedimentation and identifies their predominant drivers. Our findings present synchronic sedimentation patterns of POC and APs but identify a 2-week delay between POC sedimentation and CH4 emissions. Despite its eutrophic status, our data demonstrate this reservoir's role as a carbon sink, sequestering 4.33 g C m−2 yr−1. This highlights the need to consider various time scales when quantifying carbon budgets in reservoirs.

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微粒有机碳沉积引发富营养化水库甲烷滞后排放
当颗粒有机碳(POC)的沉积量超过二氧化碳和甲烷的排放量时,水库就会成为碳汇。浮游植物产生的酸性多糖(APs)聚集成颗粒有机物,促进碳向沉积物输出。沉积物中的这种 POC 来源可在不同时间尺度上矿化为二氧化碳和甲烷。我们的研究以地中海水库为中心,阐明了 APs 和 POC 沉积的物候趋势,并确定了其主要驱动因素。我们的研究结果表明了 POC 和 APs 的同步沉积模式,但发现 POC 沉积与 CH4 排放之间存在 2 周的延迟。尽管该水库处于富营养化状态,但我们的数据证明了它作为碳汇的作用,每年可固着 4.33 克碳 m-2-1 。这强调了在量化水库碳预算时考虑各种时间尺度的必要性。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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