Study of Organic Carbon Content in Seagrass Meadows of Sattahip Bay, Chonburi Province, Thailand
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Abstract
This research aimed to study the amount of organic carbon, organic carbon flux in sediments, and stable isotopes of carbon precipitated into 3 types of seagrass areas: 0% no seagrass area, <25% seagrass cover, and >75% seagrass cover at the beach in front of Apakornkiatwong Hospital, Sattahip Bay, Sattahip District, Chonburi Province. Water quality samples were collected and sediment traps were left in the study area for 7 days. Samples were collected twice in the summer (March) and the rainy season (June) of 2022. The results showed that the accumulation of organic matter in areas with seagrass cover <25% and >75% could trap more sediment than the area without seagrass (0%) during summer by about 10 times and about 2 times in the rainy season. The amount of organic carbon flux in the rainy season was significantly different from the summer, with an average value in the rainy season of 11.31±5.99 g C m-2 day-1, which was higher than that in the summer, which was 1.69±1.81 g C m-2 day-1. The amount of organic carbon sedimented in seagrass covers >75 % had the highest accumulation, followed by <25 % and 0%, respectively. The ratios of stable isotopes of carbon (d 13C) can be used to identify the sources of organic matter transported into the seagrass areas. It was found that the sediments were sourced from plankton -21 ‰ and suspended organic sediments of -28.5 to -21 ‰ (organismal debris) the most. Therefore, the accumulation of organic carbon, organic carbon flux and stable isotopes of carbon in sediments are related to the type of seagrass covers.
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