Triple locks on soil organic carbon exerted by sphagnum acid in wetlands

doi:10.1016/j.gca.2021.09.028

	Triple locks on soil organic carbon exerted by sphagnum acid in wetlands
	Zhao, Yunpeng; Liu, Chengzhu; Wang, Simin; Wang, Yiyun; Liu, Xiaoqing; Luo, Wanqing; Feng, Xiaojuan
	2021
发表期刊	GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN	0016-7037
卷号	315 页码:24-37
摘要	Sphagnum acid, a major phenolic metabolite of Sphagnum mosses, is considered to play a key role in the remarkable accumulation of organic matter in Sphagnum-dominated wetlands. However, while previous studies have mainly focused on the antimicrobial property of Sphagnum metabolites, the effects of sphagnum acid on other soil biogeochemical processes related to soil organic carbon (SOC) stabilization are poorly investigated. Here we employ a series of incubation experiments involving sphagnum acid amendment into natural wetland soils and artificial reaction systems to comprehensively evaluate potential pathways driving SOC stabilization by sphagnum acid. We show that sphagnum acid greatly enhances the reductive dissolution of ferric iron [Fe(III)] (hydr)oxides in both wetland soils and synthetic Fe(III)-organic matter complexes, induces the formation of amorphous and poorly-crystalline Fe(III) and increases Fe-bound organic carbon. Furthermore, sphagnum acid quenches hydroxyl radicals produced by Fenton reactions during redox oscillations and indirectly suppresses the activity of phenol oxidase and b-glucosidase by inhibiting microbial activity, acidification and increasing enzyme sorption to newly formed Fe(III). Hence, sphagnum acid exerts triple locks on SOC through (i) Fe protection of organic matter, (ii) radical quenching, and (iii) microbial suppression. These important but under-investigated pathways are all closely related to Fe transformation, highlighting the key role of Sphagnum metabolite-Fe-organic matter interactions in regulating wetland soil carbon sinks. Changing distribution of Sphagnum under climate change and human activity will have cascading effects on soil Fe species, microbial activity and SOC stabilization, which warrants further investigation in the attempt to protect and increase wetland soil carbon stocks. (C) 2021 Elsevier Ltd. All rights reserved.
关键词	Sphagnum iron (Fe) Radicals Enzyme Reductive dissolution Organic matter
学科领域	Geochemistry & Geophysics
DOI	10.1016/j.gca.2021.09.028
收录类别	SCI
语种	英语
WOS关键词	REDUCTIVE DISSOLUTION ; HYDROXYL RADICALS ; MATTER ASSOCIATIONS ; MINERAL SURFACES ; IRON ; FERRIHYDRITE ; SUBSTANCES ; COPRECIPITATION ; ADSORPTION ; PEATLANDS
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000706959500002
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
EISSN	1872-9533
资助机构	National Natural Science Foundation of China [42025303, 41773067, 31988102]
作者邮箱	xfeng@ibcas.ac.cn
引用统计	被引频次：19[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/26404
专题	植被与环境变化国家重点实验室
作者单位	Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China; Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Yunpeng,Liu, Chengzhu,Wang, Simin,et al. Triple locks on soil organic carbon exerted by sphagnum acid in wetlands[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,315:24-37.
APA	Zhao, Yunpeng.,Liu, Chengzhu.,Wang, Simin.,Wang, Yiyun.,Liu, Xiaoqing.,...&Feng, Xiaojuan.(2021).Triple locks on soil organic carbon exerted by sphagnum acid in wetlands.GEOCHIMICA ET COSMOCHIMICA ACTA,315,24-37.
MLA	Zhao, Yunpeng,et al."Triple locks on soil organic carbon exerted by sphagnum acid in wetlands".GEOCHIMICA ET COSMOCHIMICA ACTA 315(2021):24-37.

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