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Impacts of Mangrove Density on Surface Sediment Accretion, Belowground Biomass and Biogeochemistry in Puttalam Lagoon, Sri Lanka

Phillips, D.H.; Kumara, M.P.; Jayatissa, L.P.; Krauss, K.W.; Huxham, M.

Authors

D.H. Phillips

M.P. Kumara

L.P. Jayatissa

K.W. Krauss



Abstract

Understanding the effects of seedling density on sediment accretion, biogeochemistry and 3 belowground biomass in mangrove systems can help explain ecological functioning and inform 4 appropriate planting densities during restoration or climate change mitigation programs. The 5 objectives of this study were to examine: 1) impacts of mangrove seedling density on surface 6 sediment accretion, texture, belowground biomass and biogeochemistry, and 2) origins of the 7 carbon (C) supplied to the mangroves in Palakuda, Puttalam Lagoon, Sri Lanka. Rhizophora 8 mucronata propagules were planted at densities of 6.96, 3.26, 1.93 and 0.95 seedlings m-2 along 9 with an unplanted control (0 seedlings m-2). The highest seedling density generally had higher 10 sediment accretion rates, finer sediments, higher belowground biomass, greatest number of fine 11 roots and highest concentrations of C and N (and the lowest C/N ratio). Sediment accretion rates,
12 belowground biomass (over 1370 days), and C and N concentrations differed significantly 13 between seedling densities. Fine roots were significantly greater compared to medium and coarse 14 roots across all plantation densities. Sulphur and carbon stable isotopes did not vary significantly 15 between different density treatments. Isotope signatures suggest surface sediment C (to a depth 16 of 1 cm) is not derived predominantly from the trees, but from seagrass adjacent to the site.

Citation

Phillips, D., Kumara, M., Jayatissa, L., Krauss, K., & Huxham, M. (2017). Impacts of Mangrove Density on Surface Sediment Accretion, Belowground Biomass and Biogeochemistry in Puttalam Lagoon, Sri Lanka. Wetlands, 37(3), 471-483. https://doi.org/10.1007/s13157-017-0883-7

Journal Article Type Article
Acceptance Date Jan 17, 2017
Online Publication Date Jan 29, 2017
Publication Date 2017-06
Deposit Date Jan 23, 2017
Publicly Available Date Jan 30, 2018
Journal Wetlands
Print ISSN 0277-5212
Electronic ISSN 1943-6246
Publisher BMC
Peer Reviewed Peer Reviewed
Volume 37
Issue 3
Pages 471-483
DOI https://doi.org/10.1007/s13157-017-0883-7
Keywords Mangroves, Sediment nutrients, Accretion, Facilitation, Sri Lanka, Biogeochemistry, 18 Belowground biomass, Stable isotopes, Carbon
Public URL http://researchrepository.napier.ac.uk/Output/668700
Contract Date Jan 24, 2017

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