Fluxes of Organic Carbon Settled in the Seagrass Area at Khung Kraben Bay, Chanthaburi Province, Thailand
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Abstract
Organic carbon flux plays an important role in the functioning of marine ecosystems. However, organic carbon buried in sediments of tropical seagrass meadows remains incompletely characterized. This research was conducted to investigate the fluxes of organic carbon in sediments settled in three densities of seagrass cover (> 75%, < 25%, and no seagrass) at Kung Kraben Bay, Chanthaburi Province during summer (March) and rainy season (June) in 2020. The results showed that organic carbon fluxes in the rainy season differed from those in the summer. The average organic carbon flux in the rainy season (10.50±5.54 g C∙m-2∙d-1) was higher than in the summer (1.00±0.55 g C∙m-2∙d-1). Organic carbon in the sediment was highest in areas with > 75% seagrass cover, followed by < 25% cover, and no seagrass. The organic carbon flux in seagrass-rich areas (> 75% cover) was on average 3.63 times higher than in areas without seagrass in the summer, and 2.33 times higher in the rainy season. Stable carbon isotopes were used to identify the sources of organic matter transported into the seagrass areas. The results showed that the organic carbon in trapped sediment samples was sourced from algae, plankton, shrimp feed, and mangrove leaves. Their temporal and spatial variation depended on the distance from the sources and the influences of environmental conditions such as runoff and sediment resuspension.
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