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Mechanistic study on laccase-mediated formation of Fe-OM associations in peatlands
Zhao, Yunpeng1; Xiang, Wu1; Zhang, Xiuzhi2; Xie, Shuyun1; Yan, Sen1; Wu, Chenxi3; Liu, Yang1
Corresponding AuthorXiang, Wu(xiangw@cug.edu.cn)
2020-10-01
Source PublicationGEODERMA
ISSN0016-7061
Volume375Pages:9
AbstractPeatlands represent one of the largest terrestrial carbon pools. Phenol oxidase is widely considered to play a critical role in the decomposition of organic matter in peatlands, which is known as the "enzymatic latch". However, our recent studies have indicated that the formation of iron-organic matter (Fe-OM) associations is more likely to occur in the presence of laccase, the largest class of phenol oxidases in soils. As the formation of Fe-OM associations is recognized as an important stabilization mechanism for soil organic matter, further clarification of the potential mechanisms contributes to a better understanding of the role of laccase in peatland carbon sequestration. In this study, a series of experiments using different phenolic compounds and peat-derived dissolved organic matter (DOM) were performed. The results from liquid chromatography-high-resolution mass spectrometry (LC-HRMS) and gel permeation chromatography (GPC) analyses indicated that laccase catalyzed the polymerization of phenolics and peat-derived DOM by coupling of the C-O bond, the C-C bond and the C-C/C-O bonds. The polymerized products can combine more effectively with Fe to form Fe-OM associations. FTIR spectral analysis indicated that organic matter associated with Fe under laccase catalysis contained more oxygen-containing functional groups but fewer aromatic C]C bonds. Although laccase catalysis can change the chemical structure of organic matter, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses showed minimal influence of laccase on the Fe chemical species in the Fe-OM associations. Thus, we propose that laccase mediated the formation of Fe-OM associations by polymerizing organic matter and by increasing the O/C ratio of organic matter. In addition, laccase can improve the sequestration of organic carbon by increasing the C/Fe molar ratio of the formed Fe-OM associations. This mechanism may provide further insight into the role of laccase in the carbon cycling in peatlands.
KeywordPeatland Laccase Soil organic matter Fe-OM association Carbon sequestration
DOI10.1016/j.geoderma.2020.114502
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University
Indexed BySCI ; SCI
Language英语
Funding ProjectNational Natural Science Foundation of China[NSFC 41977263] ; National Natural Science Foundation of China[41472316] ; Fundamental Research Funds for the Central University[CUG170104]
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000551513100041
WOS KeywordDISSOLVED ORGANIC-MATTER ; IRON ; CARBON ; TRANSFORMATIONS ; COPRECIPITATION ; DECOMPOSITION ; PRESERVATION ; ECOSYSTEMS ; OXIDATION ; LATCH
PublisherELSEVIER
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University ; Fundamental Research Funds for the Central University
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Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/36865
Collection水环境工程研究中心_期刊论文
Corresponding AuthorXiang, Wu
Affiliation1.China Univ Geosci, Sch Earth Sci, Hubei Key Lab Crit Zone Evolut, Wuhan 430074, Peoples R China
2.Hebei Inst Geol Survey, Shijiazhuang 050081, Hebei, Peoples R China
3.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Yunpeng,Xiang, Wu,Zhang, Xiuzhi,et al. Mechanistic study on laccase-mediated formation of Fe-OM associations in peatlands[J]. GEODERMA,2020,375:9.
APA Zhao, Yunpeng.,Xiang, Wu.,Zhang, Xiuzhi.,Xie, Shuyun.,Yan, Sen.,...&Liu, Yang.(2020).Mechanistic study on laccase-mediated formation of Fe-OM associations in peatlands.GEODERMA,375,9.
MLA Zhao, Yunpeng,et al."Mechanistic study on laccase-mediated formation of Fe-OM associations in peatlands".GEODERMA 375(2020):9.
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