Sediments of blue carbon vegetation are becoming a sink of natural and anthropogenic pollutants, such as polycyclic aromatic hydrocarbons (PAHs). However, the extent to which PAHs are accumulated and varied in blue carbon sediments, and the impact of blue carbon vegetation on the accumulation and retention capacity of PAHs, have been poorly explored. This study examines the sedimentary records of PAHs in profiles from mangrove plantation, saltmarsh, and mudflat in Ximen Island and Maoyan Island of Yueqing Bay, China. The existence of blue carbon vegetation provides a sheltered environment for the accelerated burial of sediment and OC. Decadal PAH sedimentation records show staged changes characterized by the emission of PAHs and colonization of blue carbon vegetation, reflecting the accelerated burial of PAHs in sediments by blue carbon vegetation colonization. In addition, the colonization of blue carbon vegetation contributes to the shift of PAH compositions in sediments. This study provides new insights into the underestimated PAH accumulation potential and retention capacity of blue carbon vegetation and the corresponding underlying sediments, supporting the environmental benefits of blue carbon vegetation.
Bibliographical noteFunding Information:
This work was supported in part by the Ministry of Natural Resources (Blue Carbon Initiative and Policy), the National Natural Science Foundation of China ( 42171398 ), the National Natural Science Foundation of China ( U2005207 ), the Fundamental Research Funds for the Zhejiang Provincial Universities ( 2021XZZX012 ). We greatly appreciate the editor and reviewers for their thoughtful and constructive comments/suggestions on the early version of this manuscript.
© 2022 Elsevier B.V.
- Blue carbon
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal