![]() Globally, tidal flat can bury 6.8 Tg C (24.9 Tg CO 2) per year and can store 0.9 Pg C (3.3 Pg CO 2) in the top meter sediment. The global average CAR of tidal flats is 129.8 g C m -2 yr -1, with the top-meter sediments containing on average 86.3 Mg C ha -1. We examined the C stocks and C accumulation rate (CAR) reported from 123 locations of tidal flat around the world and compared these results with data from mangroves, salt marshes, and seagrass meadows. In unvegetated tidal flat ecosystems, sediment is the most important carbon reservoir, similar to that of vegetated coastal wetlands (i.e., mangroves, salt marshes, and seagrass). Nevertheless, the consequences of tidal flat loss and implications for services such as carbon (C) sequestration have not been assessed. Tidal flats are widely distributed and provide a variety of ecosystem services. Li Marine Science Laboratory, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
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