Carbon Geochemistry Cycle of Coastal Blue Carbon Ecosystem
Min Zhang, Minhan Dai*
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361102，China（minzhang@stu.xmu.edu.cn)
The world's major carbon pools include the atmosphere, oceans, fossil fuels, as well as vegetation, soil and debris. About one-third of anthropogenic CO2 emissions absorbed by oceans through physical, chemical and biological processes. Drive by solubility pumps and biological pumps, the ocean is the largest carbon pool, estimated to contain 3.8 trillion tons of carbon (Gt C). Among them, coastal zone, although only covers 7% of global ocean area, it accounts for 25% of the marine primary productivity, 86% of the marine fishery catch and 50% of the blue carbon sink. In 2009, the United Nations released a relevant report, "blue carbon" as a new term came into being, seagrass beds, mangroves, salt marshes are considered as three important "blue carbon" ecosystems in coastal zones, and gradually recognized and paid attention to. Although "blue carbon" ecosystem only accounts for a small part of the Marine system area, the carbon storage in the sediments of "blue carbon" ecosystem accounts for 46.9% of the total Marine sediment carbon storage. It is imperative that we improve our understanding of how these systems currently function as carbon sinks, and how carbon geochemistry cycle is likely to be affected by future changes.
Keywords：Coastal, Blue carbon ecosystem, Carbon, Biogeochemical cycle
