亚马逊河干流中颗粒有机碳的热反应性和分子多样性

IF 3.5 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Sarah Z. Rosengard, Jose Mauro S. Moura, Robert G. M. Spencer, Carl Johnson, Ann McNichol, Brenna Boehman, Valier Galy
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引用次数: 0

摘要

亚马逊河调动了陆地到沿海海洋沉积物中颗粒有机碳(POC)的最大通量之一,在海洋生物圈有机碳的长期封存中发挥了重要作用。对亚马逊河干流、Solimões河、马德拉河和Tapajós河的悬浮沉积物进行斜坡氧化(RPO)分析,为通过热反应性分析河流POC提供了机会,提取了这些样品中特定生物分子池的活化能分布,并表征了漫滩中POC的分子多样性。热反应性数据表明,亚马逊河流域的POC在不同样品中具有较宽但相对均匀的活化能范围,表明河流悬浮颗粒有机碳的降解历史在主河道和不同支流的深度上相对恒定。与稳定碳同位素和放射性碳同位素分析相结合的活化能分布表明,约85%的主POC来自一系列部分退化的陆地来源,可能是来自矿质土壤层的有机质,并且类似范围的土壤来源影响支流样品的生物分子多样性。与先前的评估一致,大约10%的河流POC通量是新鲜植被,高达5%是岩质有机质。对亚马逊河到海洋连续体的样本进行扩展的RPO分析,将提供一个机会来追踪下游这些不同有机物质池的命运,这与过去对河流POC的化合物特异性和批量分析有独特的不同,但又互为补充。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Thermal Reactivity and Molecular Diversity of Particulate Organic Carbon in the Amazon River Mainstem

The Thermal Reactivity and Molecular Diversity of Particulate Organic Carbon in the Amazon River Mainstem

The Amazon River mobilizes one of the largest fluxes of particulate organic carbon (POC) from land to coastal ocean sediments, playing an important role in the long-term sequestration of biospheric organic carbon in the ocean. Ramped oxidation (RPO) analyses of suspended sediments collected from the Amazon River mainstem, Solimões River, Madeira River, and Tapajós River presented an opportunity to parse riverine POC by thermal reactivity, extract the activation energy distributions of specific biomolecular pools in these samples, and characterize the molecular diversity of POC across the floodplain. The thermal reactivity data imply that POC from the Amazon River basin spans a wide but relatively homogenous activation energy range across samples, suggesting that the degradation history of the organic carbon comprising riverine suspended particles is relatively constant across depths within the mainstem and different tributary locations. Coupling activation energy distributions to stable and radiocarbon isotopic analyses shows that ca. 85% of mainstem POC derives from a range of partially degraded terrestrial sources, likely organic matter from mineral soil horizons, and that a similar range of soil sources influences the biomolecular diversity in tributary samples. In agreement with earlier assessments, ca. 10% of the riverine POC flux is fresh vegetation and up to 5% of it is petrogenic organic matter. Expanded RPO analyses of samples across the Amazon river-to-ocean continuum would provide an opportunity to track the fate of these different organic matter pools downstream that is uniquely different from, but complementary to, past compound-specific and bulk analyses of riverine POC.

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来源期刊
Journal of Geophysical Research: Biogeosciences
Journal of Geophysical Research: Biogeosciences Earth and Planetary Sciences-Paleontology
CiteScore
6.60
自引率
5.40%
发文量
242
期刊介绍: JGR-Biogeosciences focuses on biogeosciences of the Earth system in the past, present, and future and the extension of this research to planetary studies. The emerging field of biogeosciences spans the intellectual interface between biology and the geosciences and attempts to understand the functions of the Earth system across multiple spatial and temporal scales. Studies in biogeosciences may use multiple lines of evidence drawn from diverse fields to gain a holistic understanding of terrestrial, freshwater, and marine ecosystems and extreme environments. Specific topics within the scope of the section include process-based theoretical, experimental, and field studies of biogeochemistry, biogeophysics, atmosphere-, land-, and ocean-ecosystem interactions, biomineralization, life in extreme environments, astrobiology, microbial processes, geomicrobiology, and evolutionary geobiology
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