Elevated Atmospheric Sulfur Deposition Affects Predominant Forms of Sulfur in Ombrotrophic Peatlands

IF 3.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Hongyan Wang, Zhi-Guo Yu, Tanja Broder, Jörg Göttlicher, Ralph Steininger, Sindy Wagner, Harald Biester, Klaus-Holger Knorr
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Abstract

Long-term transformations of sulfur from atmospheric deposition in ombrotrophic peatlands have rarely been studied, although the potential impact on carbon mineralization and particularly methane formation is acknowledged. To elucidate the long-term fate of sulfur in peat, we therefore applied sulfur K-edge X-ray absorption near-edge structure (XANES) spectroscopy to investigate peatlands with either natural or anthropogenic atmospheric sulfur deposition. A peatland in central Europe (Germany, BBM) experienced high sulfur deposition during the Industrial Revolution, and an oceanic peatland (Chilean Patagonia, PBr) continuously exposed to aerosols from sea spray, were investigated. During early phases of site BBM, when sulfur deposition was constantly low, wet-chemical extractions indicated that 98% ± 0.7% of sulfur was present as organic sulfur. The S K-edge XANES fitting suggested that sulfur redox transformations mainly occurred near the water table, at which reduced sulfur forms (primarily organic sulfides, and thiols) increased from ∼40% to and stabilized at 65% ± 4% in anoxic peat. An increased contribution of reduced sulfur forms was observed in the polluted section of BBM and entire peat profile of PBr. While increases in reduced inorganic sulfur (TRIS) likely depended on available Fe, rises in the ratio of reduced organic sulfur to total organic sulfur from both sites were pronounced. This increase in reduced organic sulfur forms likely resulted from abiotic sulphurization of organic carbon after sulfate reduction. Our study highlights the long-term fate of elevated sulfur in ombrotrophic peatlands, being mainly transformed into reduced organic sulfur.

大气硫沉降升高影响了营养型泥炭地硫的主要形态
虽然对碳矿化,特别是甲烷形成的潜在影响已得到承认,但对大气沉积在营养型泥炭地中硫的长期转化很少进行研究。因此,为了阐明泥炭中硫的长期命运,我们应用硫k边x射线吸收近边缘结构(XANES)光谱来研究自然或人为大气硫沉积的泥炭地。中欧(德国,BBM)的泥炭地在工业革命期间经历了高硫沉积,而海洋泥炭地(智利巴塔哥尼亚,PBr)则持续暴露于海洋喷雾的气溶胶中。在站点BBM的早期阶段,当硫沉积持续较低时,湿化学萃取表明98%±0.7%的硫以有机硫的形式存在。S - k边缘XANES拟合表明,硫氧化还原转化主要发生在地下水位附近,在缺氧泥炭中,还原硫形式(主要是有机硫化物和硫醇)从~ 40%增加到65%±4%,并稳定在65%±4%。在BBM污染剖面和整个PBr泥炭剖面中,还原态硫的贡献增加。虽然还原无机硫(TRIS)的增加可能取决于有效铁,但两个地点的还原有机硫与总有机硫的比例都明显上升。这种减少的有机硫形式的增加可能是由于硫酸盐还原后有机碳的非生物硫化。我们的研究强调了近营养型泥炭地硫含量升高的长期命运,主要转化为还原的有机硫。
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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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