DOI: 10.1029/2019GB006334
论文题名: Increased Organic Carbon Burial in Northern Florida Mangrove-Salt Marsh Transition Zones
作者: Vaughn D.R. ; Bianchi T.S. ; Shields M.R. ; Kenney W.F. ; Osborne T.Z.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2020
卷: 34, 期: 5 语种: 英语
英文关键词: biomass
; climate change
; mangrove
; organic carbon
; paleosol
; saltmarsh
; sea level change
; sedimentation rate
; soil carbon
; transition zone
; Florida [United States]
; Gulf Coast [United States]
; United States
; algae
; Rhizophoraceae
; Tracheophyta
学科: amino acids
; biomarker
; blue carbon
; carbon burial
; lignin
; mangrove migration
中文摘要: Blue carbon habitats like salt marshes and mangroves bury large amounts of carbon with limited area; however, they also are increasingly susceptible to current climate change. Combined effects of rising temperatures, decreasing freeze frequencies, and increasing sea level rise rates are resulting in mangrove replacement of salt marshes along the southern United States. Surface soils analyzed here from wetlands along northern Florida Atlantic and Gulf Coasts showed higher apparent sedimentation rates in mangrove-dominated sites (1.5–3.2 mm yr−1) and where mangroves are migrating into the marsh (termed transition sites, 2.3–3.8 mm yr−1). Average carbon burial rates were higher in transition sites for both coasts (27–47 g C·m−2·yr−1) compared to the respective mangrove (10–22 g C·m−2·yr−1) and salt marsh (4–7 g C·m−2·yr−1) sites. Lignin biomarker data (Λ-6, Λ-8, and C/V) indicated that mangrove and transition sites had higher lignin inputs from woody vascular plants compared to salt marsh sites, which may slow decadal- to centennial-scale decay. Higher amino acid concentrations in mangrove soils relative to mangrove biomass (1.8–2.3 mmol g C−1 vs. 0.2–0.9 mmol g C−1) and lower C/N indicated that these mangrove sites receive higher algal inputs than the transition and salt marsh sites, attributed to greater tidal inundation in the mangrove sites given their position near the shoreline. Overall, increased accretion, carbon burial, and lignin in mangrove transition sites indicate that this migration may increase carbon burial and increase the stability and residence time of buried soil carbon. Future studies on mangrove migration in northern Florida can verify this through replication and elevation analysis. ©2020. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160044
Appears in Collections: 气候变化与战略
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作者单位: Department of Geological Sciences, University of Florida, Gainesville, FL, United States; Now at Department of Earth, Ocean, and Atmospheric Sciences, Florida State University, Tallahassee, FL, United States; Now at Geochemical and Environmental Research Group, Texas A&M University, College Station, TX, United States; Land Use and Environmental Change Institute, University of Florida, Gainesville, FL, United States; Whitney Laboratory for Marine Bioscience, University of Florida, St. Augustine, FL, United States; Department of Soil and Water Sciences, University of Florida, Gainesville, FL, United States
Recommended Citation:
Vaughn D.R.,Bianchi T.S.,Shields M.R.,et al. Increased Organic Carbon Burial in Northern Florida Mangrove-Salt Marsh Transition Zones[J]. Global Biogeochemical Cycles,2020-01-01,34(5)