Low Carbon sink capacity of Red Sea mangroves

Hanan Almahasheer, Oscar Serrano, Carlos M. Duarte, Ariane Arias-Ortiz, Pere Masque, Xabier Irigoien

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Mangroves forests of Avicennia marina occupy about 135 km2 in the Red Sea and represent one of the most important vegetated communities in this otherwise arid and oligotrophic region. We assessed the soil organic carbon (C-org) stocks, soil accretion rates (SAR; mm y(-1)) and soil C-org sequestration rates (g C-org m(-2) yr(-1)) in 10 mangrove sites within four locations along the Saudi coast of the Central Red Sea. Soil C-org density and stock in Red Sea mangroves were among the lowest reported globally, with an average of 4 +/- 0.3 mg Corg cm(-3) and 43 +/- 5 Mg C-org ha(-1) (in 1 m-thick soils), respectively. Sequestration rates of C-org, estimated at 3 +/- 1 and 15 +/- 1 g C-org m(-2) yr(-1) for the long (millennia) and short (last century) temporal scales, respectively, were also relatively low compared to mangrove habitats from more humid bioregions. In contrast, the accretion rates of Central Red Sea mangroves soils were within the range reported for global mangrove forests. The relatively low C-org sink capacity of Red Sea mangroves could be due to the extreme environmental conditions such as low rainfall, nutrient limitation and high temperature, reducing the growth rates of the mangroves and increasing soil respiration rates.
Original languageEnglish (US)
JournalScientific Reports
Issue number1
StatePublished - Aug 29 2017

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The research reported in this paper was supported by King Abdullah University of Science and Technology through the baseline funding to C.M. Duarte and X. Irigoien. O.S. was supported by an ARC DECRA (DE170101524) and Edith Cowan University Collaboration Enhancement Scheme. PM and AAO acknowledge the support by the Generalitat de Catalunya (grant 2014 SGR-1356). This work is contributing to the ICTA 'Unit of Excellence' (MinECo, MDM2015-0552). AAO was supported by a PhD grant of Obra Social "la Caixa". We thank CMOR staff for support and help during sampling the soil corers. And thank Vincent Saderne for his help with Bacon analysis.


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