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Carbon Storage And Its Influencing Factors In Hainan Dongzhangang Mangrove Wetlands

Kun Xin, Kui Yan, Chun Gao, Zhen Li

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Mangrove wetlands are considered to be the largest carbon storage ecotype in subtropical and tropical coastal areas. The aim of the present study was to understand the distribution features of carbon storage in the Hainan Dongzhaigang mangrove wetlands in China. Using the 3S techniques (including remote sensing, geography information system and global position system) and field investigations, mangrove communities in study area were divided into 12 main types and carbon storage in each community was analysed. Soil organic carbon (SOC) was determined by the potassium dichromate external heating method, plant biomass was calculated using equations and the litter from each community was collected every month and its carbon storage was determined using the decomposition rate model. Total carbon storage in the 12 mangrove communities was 16.81×104Mg of which 13.45×104Mg (80.01%) was fixed by the soil, 2.66×104Mg (15.82%) was fixed by plants and 0.69×104Mg (4.10%) was fixed by litter. Comparisons of carbon storage between communities showed that the Sonneratia caseolaris community stored the most carbon (14.17MgCha–1), followed by the Bruguiera sexangula community (14.12MgCha–1), whereas carbon storage was lowest in the semimangrove community, including Pongamia pinnata and Hibiscus tiliaceus, and the herbaceous community, including Acrostichum aureum and Acanthus ilicifolius.