期刊
ESTUARINE COASTAL AND SHELF SCIENCE
卷 192, 期 -, 页码 108-116出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2017.05.009
关键词
Organic carbon burial; (210)pb; Pu239+240; Geochronologies; Mangrove expansion; Anthropogenic deforestation
资金
- Brazilian Research Council (CNPq)
- Australian Research Council [DE160100443, DP150103286, LE140100083]
- Universidad Federal Fluminense (UFF-Brazil)
- Australian Research Council [LE140100083] Funding Source: Australian Research Council
Mangroves are rapidly being lost to deforestation in many locations while expanding their areal extent in other subtropical and temperate regions. Currently, there is a paucity of information on how these changes may alter the carbon accumulation capacity of coastal areas. Here, sediment cores were collected from two areas and used to determine the influence of mangrove migration and deforestation on sediment carbon stocks and accumulation rates. The deforested area contained lower sedimentary organic carbon stocks (2767 +/- 580 g m(-2)) compared to the preserved area (6949 +/- 84 g m(-2)). Sediment accumulation rates, derived from excess Pb-210 and Pu239+240 depositional signatures, ranged from 0.19 to 0.35 cm yr(-1). The total sedimentary organic carbon (TOC) accumulation rates for the period after mangrove deforestation (2005-2011) exhibited significant differences between preserved areas (Core C: 43.9 +/- 6.9 g m(-2) yr(-1); Core D: 83.1 +/- 5.9 g m(-2) yr(-1)) and the deforested area (Core B: 25.8 +/- 6.0 g m(-2) yr(-1)), suggesting a decline after deforestation. For the preserved area, the TOC accumulation under mangrove dominance (65.5 +/- 16.3 g m(-2) yr(-1), after 1944) was higher than under saltmarsh dominance (23.5 +/- 15.9 g m(-2) yr(-1,) before 1944), as revealed by carbon isotopic signatures (delta C-13). The increase in the TOC accumulation due to mangrove expansion in this New Zealand estuary was conservatively estimated as three-fold higher, and two-fold higher in stocks in comparison to the period when this ecosystem was dominated by non-mangrove vegetation. (C) 2017 Elsevier Ltd. All rights reserved.
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