Integrated effects of bioturbation, warming and sea-level rise on mobility of sulfide and metalloids in sediment porewater of mangrove wetlands

Pan，Feng1; Xiao，Kai2; Cai，Yu3; Li，Hailong2; Guo，Zhanrong3; Wang，Xinhong1; Zheng，Yan2; Zheng，Chunmiao2; Bostick，Benjamin Carlos4; Michael，Holly A.5

2023-04-15

10.1016/j.watres.2023.119788

WATER RESEARCH   Impact Factor & Quartile

0043-1354

1879-2448

Global warming and sea-level rise exert profound impacts on coastal mangrove ecosystems, where widespread benthic crabs change sediment properties and regulate material cycles. How crab bioturbation perturbs the mobilities of bioavailable arsenic (As), antimony (Sb) and sulfide in sediment-water systems and their variability in response to temperature and sea-level rise is still unknown. By combining field monitoring and laboratory experiments, we found that As was mobilized under sulfidic conditions while Sb was mobilized under oxic conditions in mangrove sediments. Crab burrowing greatly enhanced oxidizing conditions, resulting in enhanced Sb mobilization and release but As sequestration by iron/manganese oxides. In control experiments with non-bioturbation, the more sulfidic conditions triggered the contrasting situation of As remobilization and release but Sb precipitation and burial. Moreover, the bioturbated sediments were highly heterogeneous for spatial distributions of labile sulfide, As and Sb as presented by 2-D high-resolution imaging and Moran's Index (patchy at the <1 cm scale). Warming stimulated stronger burrowing activities, which led to more oxic conditions and further Sb mobilization and As sequestration, whilst sea-level rise did the opposite via suppressing crab burrowing activity. This work highlights that global climate changes have the potential to significantly alter element cycles in coastal mangrove wetlands by regulating benthic bioturbation and redox chemistry.

Antimony Arsenic Biogeochemistry Bioturbation High-resolution imaging Mangrove wetland

SCI

English

NI Journal Papers

Corresponding

National Natural Science Foundation of China["42106038","42177046"] ; China Post- doctoral Science Foundation[2020M682085]

Engineering ; Environmental Sciences & Ecology ; Water Resources

Engineering, Environmental ; Environmental Sciences ; Water Resources

WOS:000953074000001

PERGAMON-ELSEVIER SCIENCE LTD

ENVIRONMENT/ECOLOGY

2-s2.0-85149223556

Scopus

1.State Key Laboratory of Marine Environmental Science,College of the Environment & Ecology,Xiamen University,Xiamen,361102,China
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.College of Ocean and Earth Sciences,Xiamen University,Xiamen,361102,China
4.Lamont-Doherty Earth Observatory,Columbia University,Palisades,10964,United States
5.Department of Geological Sciences,University of Delaware,Newark,United States

Pan，Feng,Xiao，Kai,Cai，Yu,et al. Integrated effects of bioturbation, warming and sea-level rise on mobility of sulfide and metalloids in sediment porewater of mangrove wetlands[J]. WATER RESEARCH,2023,233.

Pan，Feng.,Xiao，Kai.,Cai，Yu.,Li，Hailong.,Guo，Zhanrong.,...&Michael，Holly A..(2023).Integrated effects of bioturbation, warming and sea-level rise on mobility of sulfide and metalloids in sediment porewater of mangrove wetlands.WATER RESEARCH,233.

Pan，Feng,et al."Integrated effects of bioturbation, warming and sea-level rise on mobility of sulfide and metalloids in sediment porewater of mangrove wetlands".WATER RESEARCH 233(2023).