Mangrove forests are vulnerably threatened by sea level rise (SLR). Vegetation organic carbon (OC) stocks areimportant for mangrove ecosystem carbon cycle. It is critical to understand how SLR affects vegetation OC stocksfor evaluating mangrove blue carbon budget and global climate change. In this study, biomass accumulation andOC stocks of mangrove vegetation were compared among three 10 year-old Kandelia obovata (a common speciesin China) mangrove forests under three intertidal elevations through species-specific allometric equations. Thisstudy simulated mangrove forests with SLR values of 0 cm, 40 cm and 80 cm, respectively, representing for thecurrent, future ～100 a and future ～200 a SLR of mangrove forests along the Jiulong River Estuary, China. SLRdirectly decreased mangrove individual density and inhibited the growth of mangrove vegetation. The totalvegetation biomasses were (12.86±0.95) kg/m2, (7.97±0.90) kg/m2 and (3.89±0.63) kg/m2 at Sites SLR 0 cm, SLR40 cm and SLR 80 cm, respectively. The total vegetation OC stock decreased by approximately 3.85 kg/m2 (interms of C) from Site SLR 0 cm to Site SLR 80 cm. Significantly lower vegetation biomass and OC stock of variouscomponents (stem, branch, leaf and root) were found at Site SLR 80 cm. Annual increments of vegetation biomassand OC stock also decreased with SLR increase. Moreover, significant lower sedimentation rate was found at SiteSLR 80 cm. These indicated that SLR will decrease mangrove vegetation biomass and OC stock, which may reduceglobal blue carbon sink by mangroves, exacerbate global warming and give positive feedback to SLR.

Jiahui Chen;Min Gao;Guangcheng Chen;Heng Zhu;Yong Ye

Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China;Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China;Fujian Provincial Station for Field Observation and Research of Island and Costal Zone in Zhangzhou, Xiamen 361005, China

海洋学报（英文版）

[1]Jiahui Chen;Min Gao;Guangcheng Chen;Heng Zhu;Yong Ye-.Biomass accumulation and organic carbon stocks of Kandelia obovata mangrove vegetation under different simulated sea levels)[J].海洋学报（英文版）,2022(08):78-86

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