期刊
ESTUARIES AND COASTS
卷 39, 期 2, 页码 385-396出版社
SPRINGER
DOI: 10.1007/s12237-015-9993-8
关键词
Climate change; Range expansion; Ecotone; Carbon storage; Mangrove; Salt marsh
资金
- National Aeronautics and Space Administration [NNX11AO94G, NNX12AF55G]
- National Science Foundation [EF 1065821]
- Link Graduate Fellowship at the Smithsonian Marine Station in Fort Pierce, FL (SMSFP) [986]
- Emerging Frontiers
- Direct For Biological Sciences [1065821] Funding Source: National Science Foundation
The climate change-induced expansion of mangroves into salt marshes could significantly alter the carbon (C) storage capacity of coastal wetlands, which have the highest average C storage per land area among unmanaged terrestrial ecosystems. Mangrove range expansion is occurring globally, but little is known about how these rapid climate-driven shifts may alter ecosystem C storage. Here, we quantify current C stocks in ecotonal wetlands across gradients of marsh- to mangrove-dominance, and use unique chronological maps of vegetation cover to estimate C stock changes from 2003 to 2010 in a 567-km(2) wildlife refuge in the mangrove-salt marsh ecotone. We report that over the 7-yr. period, total wetland C stocks increased 22 % due to mangrove encroachment into salt marshes. Newly established mangrove stands stored twice as much C on a per area basis as salt marsh primarily due to differences in aboveground biomass, and mangrove cover increased by 69 % during this short time interval. Wetland C storage within the wildlife refuge increased at a rate of 2.7 Mg C ha(-1) yr.(-1), more than doubling the naturally high coastal wetland C sequestration rates. Mangrove expansion could account for a globally significant increase of terrestrial C storage, which may exert a considerable negative feedback on warming.
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