Hortua, Daniel, Friess, Daniel, Zimmer, Martin and Gillis, Lucy (2019) The Relevance of Particulate Matter Interchange Between Mangrove Forests, Seagrass Beds and Tidal Flats for Singapore Blue Carbon. [Poster] In: MMM5. , 01.07.-05.07.2019, Singapore .

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Abstract

Mangrove forests and seagrass beds in South East Asia are reported as being important “Blue carbon” sinks with high amounts of carbon stored. Connectivity between adjacent ecosystems has been shown to influence processes such as production within ecosystems, due to the interchange of particulate organic matter and nutrients that can enhance primary production. We estimated the carbon stored in the living biomass of mangroves and seagrasses, using species-specific allometric equations, and quantified the sediment carbon content. During ebb tide, particulate organic matter, dissolved organic carbon, particulate organic carbon and chlorophyll-a contents were measured. The exchange of particulate organic matter among ecosystems (mangrove forests, seagrass beds and tidal flats) was quantified based on stable isotope signatures, using a MixSIAR model approach. Aboveground carbon stores in the biomass ranged from 25 to 202 MgC ha-1, belowground biomass stored 12 - 69 MgC ha-1, and the sediment carbon stock was between 4 and 50 MgC ha-1). Dissolved:particulate ratio vary between 0.8 and 4.2 being dissolved organic carbon higher in most of the locations. Contents of dissolved organic carbon and chlorophyll-a were significantly correlated (p<0.01 and R2=0.3). Locations where mangrove forests had higher sediment carbon also exhibited higher carbon contents in the adjacent tidal flats. Mangrove trees and oceanic sources were the greatest contributors to particulate organic matter in all locations except in Sungei Buloh where terrestrial plants contribute more than mangrove forests. Macroalgae contributed more to the particulate organic carbon than seagrasses. Our results suggest that depending on the location mangrove forests act as donors or recipients of carbon for adjacent ecosystems such as seagrass beds and tidal flats. Connectivity of adjacent ecosystems should be taken into account in ecosystem management in order to enhance the ecosystem services of carbon storage provided by mangrove forest and adjacent coastal ecosystems.

Document Type: Conference or Workshop Item (Poster)
Research affiliation: Ecology > Mangrove Ecology
Affiliations > Not ZMT
Date Deposited: 21 Oct 2019 10:33
Last Modified: 01 Oct 2020 12:59
URI: http://cris.leibniz-zmt.de/id/eprint/2783

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