Although seagrass ecosystems provide various ecosystem services, the implications in correspondence with temporal changes of the meadows is lacking. In this study, we analyzed two-decade changes of the seagrass area with the organic carbon storage and the sources at Libong island in Thailand. The seagrass area covered 841 ha in 2019, after two decades of decline (3.2 and 0.6% yr⁻¹ between 2004 and 2009 and 2009–2019, respectively). Although δ¹³C was not significant between depth layers (p > 0.05), the general trend suggested that the terrestrial source of carbon is dominating bottom depth layer (31.7–37.2%), mixture of terrestrial (19.7–30.3%), seagrass (22.9–29.6%), mangrove (16.8–43.0%) and CPOM (11.2–25.4%) in the middle, and mangroves and seagrasses are dominating surface layer (28.3–66.2 and 29.3–36.5%, respectively). These trends approximately correspond to the areal changes of the meadows, as well as changes of urban area and water quality, providing detailed information on the meadow changes and possible causes.

尽管海草生态系统提供了各种生态系统服务，但缺乏与草地的时间变化相对应的含义。在这项研究中，我们用泰国里邦岛的有机碳储量和来源分析了海草面积的十年变化。经过两年的下降（2004年至2009年和2009- 2019年分别为3.2和0.6％yr ^-1），海草面积在2019年达到841公顷。虽然δ ¹³ C为不深度层之间显著（p > 0.05），总体趋势表明，陆地碳源主要是底部深度层（31.7–37.2％），陆地混合物（19.7–30.3％），海草（22.9–29.6％），红树林（16.8–43.0％） ）和中部的CPOM（11.2–25.4％），红树林和海草是主要的表层（分别为28.3–66.2和29.3–36.5％）。这些趋势大致对应于草地的面积变化，以及城市面积和水质的变化，提供了有关草地变化及其可能原因的详细信息。