Decoupling of dissolved organic carbon (DOC) and dissolved black carbon (DBC) in a temperate fluvial network

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2024-08-19 DOI:10.1007/s10533-024-01172-w
Adrian M. Bass, Chao Gu
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Abstract

Black carbon (BC) is a significant component of the global carbon cycle both in terrestrial and aquatic systems. Dissolved black carbon (DBC) is a significant portion of the total dissolved organic carbon (DOC) pool and represents a major flux of recalcitrant carbon to the coastal and deep oceans. Dissolved black carbon can originate from multiple sources related to its relative biogeochemical reactivity with the dynamics of highly recalcitrant DBC integral to long-term sequestration. Thus, understanding how the more recalcitrant fractions of DBC varies in diverse catchments is critical and currently underexplored. We used hydrogen pyrolysis to isolate the fraction of DBC with aromatic clusters above 7 rings, representing the more stable components. Here we report the dynamics of DBCHyPy over a hydrological year in a temperate catchment, with a long history of coal mining extraction. Quarterly measurements of DBC were undertaken from two main channel and four tributary sites. Hydrogen pyrolysis derived DBC comprised a significant percentage of the total DOC flux (3.2% to 28.3%) and included significant spatial variability. Unlike other studies examining more reactive DBC fractions, bulk DOC concentrations and DBCHyPy were poorly correlated when considered over an annual scale. Rather, DBCHyPy was correlated with indicators of groundwater such as dissolved inorganic carbon and conductivity. Data suggest a consistent source of DBCHyPy not subject to the same mobilisation drivers as DOC, which shows substantial seasonality. Rather, our data shows a potentially consistent supply of stable DBC originating from the coal mining-influenced groundwater. Petrogenic sources of DBC have been poorly constrained to date, the data presented here suggests in some catchments it may be significant and yield catchment scale DOC-DBC decoupling. The dynamics of DBC have implications for carbon fluxes, pollution transport and water quality/treatment requirements. These preliminary findings suggest potentially complex drivers in spatially heterogeneous catchments, contrasting with previous work finding tight DOC-DBC mobilisation dynamics.

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温带河网中溶解有机碳(DOC)和溶解黑碳(DBC)的解耦关系
黑碳(BC)是陆地和水生系统中全球碳循环的重要组成部分。溶解性黑碳(DBC)在溶解性有机碳(DOC)总量中占很大比例,是向沿岸和深海输送难溶碳的主要通量。溶解黑碳有多种来源,与其相对的生物地球化学反应活性有关,其中高难降解性 DBC 的动态变化与长期固碳密不可分。因此,了解 DBC 中难降解部分在不同集水区的变化情况至关重要,而目前对这一问题的探索还很不够。我们利用氢热解分离出了 DBC 中具有 7 环以上芳香簇的部分,这部分代表了更稳定的成分。在此,我们报告了在一个温带集水区的一个水文年中 DBCHyPy 的动态变化情况,该集水区有着悠久的煤矿开采历史。我们在两个主河道和四个支流地点对 DBC 进行了季度测量。氢热解产生的 DBC 在 DOC 总通量中占了很大比例(3.2% 到 28.3%),而且空间变化很大。与研究活性更强的 DBC 部分的其他研究不同,在考虑年度尺度时,DOC 总量浓度与 DBCHyPy 的相关性很低。相反,DBCHyPy 与溶解无机碳和电导率等地下水指标相关。数据表明,DBCHyPy 的来源是一致的,并不像 DOC 那样受移动驱动因素的影响,DBCHyPy 显示出很大的季节性。相反,我们的数据显示,受采煤影响的地下水可能会持续供应稳定的 DBC。迄今为止,DBC 的成岩来源还没有得到很好的确定,本文提供的数据表明,在某些流域,DBC 的成岩来源可能很重要,并能产生流域尺度的 DOC-DBC解耦。DBC 的动态变化对碳通量、污染迁移和水质/处理要求都有影响。这些初步研究结果表明,在空间异构的集水区中,可能存在复杂的驱动因素,这与之前发现的 DOC-DBC 紧密动员动态形成了鲜明对比。
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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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