Journal
MARINE POLLUTION BULLETIN
Volume 126, Issue -, Pages 275-280Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2017.11.018
Keywords
Mangrove sediments; Carbon accumulation; Organic matter source; Deforestation; Eutrophication
Funding
- Brazilian Research Council (CNPq)
- Australian Research Council [DE160100443]
- Universidade Federal Fluminense (UFF-Brazil)
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro (FAPERJ)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
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A dated sediment core from an eutrophic mangrove area presented non-significant differences in carbon accumulation rates before (55.7 +/- 10.2 g m(-2) yr(-1)) and after three decades of deforestation (59.7 +/- 7.2 g m(-2) yr(-1)). Although eutrophication effects appear to compensate the loss of mangrove organic matter input, the results in this work show a threefold lower carbon accumulation than the global averages estimated for mangrove sediments. The effects of increasing eutrophication and enhanced sediment dry bulk density observed after deforestation (similar to 30% higher) did not result in higher carbon stocks. Moreover, the lower TOC:OP (< 400) and C:N (similar to 20) molar ratios, as well as increased nutrient accumulation, reflect the dominance of phytoplankton-derived organic matter after deforestation, resulting in less-efficient sedimentary carbon sinks. These results indicate that the organic material deposited from eutrophication may not compensate mangrove deforestation losses on carbon accumulation in mangrove ecosystems.
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