Journal
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
Volume 119, Issue 10, Pages 2032-2048Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JG002715
Keywords
mangroves; Pb-210 dating; organic carbon burial; sediment accretion; Everglades; coastal wetlands
Funding
- National Science Foundation under South Florida Water, Sustainability Climate grant [1204079]
- University of South Florida College of Marine Science
- Florida Coastal Everglades Long-term Ecological Research program - National Science Foundation [DBI-0620409]
- Environments Program of the Ecosystems Mission Area
- Greater Everglades Priority Ecosystems Studies Program of the U.S. Geological Survey
- National Science Foundation
- U.S. Geological Survey, Southeast Ecological Science Center
- Southern Cross University postdoctoral fellowship
- Directorate For Geosciences
- Division Of Earth Sciences [1204079] Funding Source: National Science Foundation
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The objective of this research was to measure temporal variability in accretion and mass sedimentation rates (including organic carbon (OC), total nitrogen (TN), and total phosphorous (TP)) from the past century in a mangrove forest on the Shark River in Everglades National Park, USA. The Pb-210 Constant Rate of Supply model was applied to six soil cores to calculate annual rates over the most recent 10, 50, and 100 year time spans. Our results show that rates integrated over longer timeframes are lower than those for shorter, recent periods of observation. Additionally, the substantial spatial variability between cores over the 10 year period is diminished over the 100 year record, raising two important implications. First, a multiple-decade assessment of soil accretion and OC burial provides a more conservative estimate and is likely to be most relevant for forecasting these rates relative to long-term processes of sea level rise and climate change mitigation. Second, a small number of sampling locations are better able to account for spatial variability over the longer periods than for the shorter periods. The site average 100year OC burial rate, 12319 (standard deviation) g m(-2)yr(-1), is low compared with global mangrove values. High TN and TP burial rates in recent decades may lead to increased soil carbon remineralization, contributing to the low carbon burial rates. Finally, the strong correlation between OC burial and accretion across this site signals the substantial contribution of OC to soil building in addition to the ecosystem service of CO2 sequestration.
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