西伯利亚西部低地河流溶解有机质循环的分子水平控制

IF 3.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Martin R. Kurek, Oleg S. Pokrovsky, Ivan V. Krickov, Artem G. Lim, Mikhail А. Korets, Robert G. M. Spencer
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引用次数: 0

摘要

西西伯利亚低地(WSL)拥有一些地球上最大的湿地和最广泛的泥炭地,在无永久冻土层到连续永久冻土层之间储存着大量的脆弱碳。随着温度和降水的变化继续改变西伯利亚的景观,碳向大气的转移和向北冰洋的出口将受到影响。然而,整个地区有机碳转移的驱动因素在很大程度上是未知的。分析了无冻土区鄂布河中游和北部连续多年冻土区塔兹河支流的季节性溶解有机碳(DOC)浓度和溶解有机质(DOM)组成。鄂布河支流的DOC和芳香族DOM的性质从春季到秋季呈上升趋势,反映了从地下水到陆源DOM的季节性转变。超高分辨率质谱分析的分子水平特征差异揭示了氧化还原过程在冬季对DOM组成的影响,而陆地DOM来源从春季地表凋落物脂肪族和高度不饱和酚类高O/C (HUPHigh O/C)化合物转移到秋季地表下土壤和HUPLow O/C化合物。此外,芳香性和有机氮与泥炭地、森林覆盖、针叶林/阔叶林比例等景观特征有关。最后,塔兹河支流与鄂布河夏季和秋季支流相似,但含氮和含硫化合物更丰富。这些特征很可能来自永久冻土的融化,我们预计,由于北极变暖的积极层扩张,北部河流的永久冻土融化会增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessing the Molecular-Level Controls of Dissolved Organic Matter Cycling in West Siberian Lowland Rivers

The West Siberian Lowland (WSL) contains some of the largest wetlands and most extensive peatlands on Earth, storing vast amounts of vulnerable carbon across permafrost-free to continuous permafrost zones. As temperature and precipitation changes continue to alter the Siberian landscape, carbon transfer to the atmosphere and export to the Arctic Ocean will be impacted. However, the drivers of organic carbon transfer are largely unknown across this region. We characterized seasonal dissolved organic carbon (DOC) concentration and dissolved organic matter (DOM) composition of WSL rivers from the middle reaches of the Ob’ River in the permafrost-free zone, as well as tributaries of the Taz River in the northern continuous permafrost zone. DOC and aromatic DOM properties increased from spring to autumn in the Ob’ tributaries, reflecting the seasonal transition from groundwater-sourced to terrestrial DOM. Differences in molecular-level signatures via ultra-high resolution mass spectrometry revealed the influence of redox processes on DOM composition in the winter while terrestrial DOM sourcing shifted from surface litter aliphatics and highly unsaturated and phenolic high-O/C (HUPHigh O/C) compounds in the spring to subsurface soils and HUPLow O/C compounds by autumn. Furthermore, aromaticity and organic N were related to landscape properties including peatlands, forest cover, and the ratio of needleleaf:broadleaf forests. Finally, the Taz River tributaries were similar to summer and autumn Ob’ tributaries, but more enriched in N and S-containing compounds. These signatures were likely derived from thawing permafrost, which we expect to increase in northern rivers due to active layer expansion in a warming Arctic.

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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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