中文版 | English
Title

Crab bioturbation drives coupled iron-phosphate-sulfide cycling in mangrove and salt marsh soils

Author
Corresponding AuthorLi,Hailong
Publication Years
2022-10-15
DOI
Source Title
ISSN
0016-7061
EISSN
1872-6259
Volume424
Abstract
Coastal wetlands sequestering abundant blue carbon in soils are biogeochemical hotspots and critical habitats for benthic animals like invertebrate fiddler crabs. Here, we reveal how crab bioturbation (i.e., burrowing activity) drives the redox geochemistry of ferrous iron (Fe(II)), phosphate (PO43-), and sulfide (S(-II)) under contrasting vegetation types and hydrological conditions. We used in-situ approaches of diffusive gradients in thin films to perform detailed mm-scale burrow observations in two subtropical wetlands with a vegetation gradient of mudflat-salt marsh-mangrove. Burrow flushing caused a top-down hydrologic connectivity through the crab burrows and thus created a deep depth for the occurrence of Fe(III) reduction and sulfate reduction which were accompanied by P mobilization. The burrow oxidation zone, indicated by lower concentrations of Fe(II), PO43- and S(-II), were shallower in mudflats and salt marshes than in mangroves due to the unique respiratory roots of mangrove plants. The redox of Fe(II), PO(4)(3-)and S(-II) in crab burrow was insensitive to the convection flow induced input of dissolved oxygen through the surrounding soil matrix, indicating the burrow soil is an independent microenvironment. Crab burrowing activities favored Fe-S coupling which is conductive the formation of pyrite and alkalinity generation. Overall, our in-situ high-resolution observations and porewater hydraulic dynamics revealed spatially variable soil geochemistry, active coupled cycling of Fe-P-S in crab burrows, and mm-scale hotspots of redox cycling within burrows.
Keywords
URL[Source Record]
Indexed By
SCI ; EI
Language
English
SUSTech Authorship
First ; Corresponding
Funding Project
National Natural Science Foun-dation of China["42177046","41972260"] ; Science, Technology and Innovation Commission of Shenzhen["JSGG20210802153535002","20200925174525002"]
WOS Research Area
Agriculture
WOS Subject
Soil Science
WOS Accession No
WOS:000822975600011
Publisher
EI Accession Number
20222612279278
EI Keywords
Carbon ; Dissolved oxygen ; Pyrites ; Redox reactions ; Soil moisture ; Sulfur compounds ; Vegetation ; Wetlands
ESI Classification Code
Geochemistry:481.2 ; Soils and Soil Mechanics:483.1 ; Biochemistry:801.2 ; Chemical Reactions:802.2 ; Chemical Products Generally:804
ESI Research Field
AGRICULTURAL SCIENCES
Scopus EID
2-s2.0-85132748727
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:6
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/352460
DepartmentSchool of Environmental Science and Engineering
Affiliation
1.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
3.College of the Environment & Ecology,Xiamen University,Xiamen,361102,China
4.Department of Marine Sciences,University of Gothenburg,Gothenburg,Sweden
First Author AffilicationSchool of Environmental Science and Engineering;  Southern University of Science and Technology
Corresponding Author AffilicationSchool of Environmental Science and Engineering;  Southern University of Science and Technology
First Author's First AffilicationSchool of Environmental Science and Engineering
Recommended Citation
GB/T 7714
Xiao,Kai,Pan,Feng,Santos,Isaac R.,et al. Crab bioturbation drives coupled iron-phosphate-sulfide cycling in mangrove and salt marsh soils[J]. GEODERMA,2022,424.
APA
Xiao,Kai.,Pan,Feng.,Santos,Isaac R..,Zheng,Yan.,Zheng,Chunmiao.,...&Li,Hailong.(2022).Crab bioturbation drives coupled iron-phosphate-sulfide cycling in mangrove and salt marsh soils.GEODERMA,424.
MLA
Xiao,Kai,et al."Crab bioturbation drives coupled iron-phosphate-sulfide cycling in mangrove and salt marsh soils".GEODERMA 424(2022).
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