期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 767, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.144695
关键词
Microplastic pollution; Sediments; Mangrove plants; Pneumatophore; Fibers
资金
- National Key Research and Development Program of China [2017YFC0506103]
- National Natural Science Foundation of China [41976161, 41876090]
- ResearchGrants Council of the Hong Kong Special Administrative Region, China [UGC/FDS16/M07/19, UGC/IDS(R)16/19]
The distribution of microplastics in mangrove sediments is influenced by plant species, with a significant positive correlation between pneumatophore density and fiber abundance. Fibers were found to be more abundant at the forest fringe than in the interior or mudflat, indicating the importance of the fringe effect.
Microplastic pollution is common in marine and coastal ecosystems, especially in mangrove wetlands. However, factors affecting the distribution of microplastics, such as plants, have not been sufficiently studied. We investigated the effect of different plant species on the distribution of sediment microplastics in two Nature Reserves in South China, viz. Futian Mangrove and Mai Po Mangrove. In Futian Mangrove, the abundance of total microplastics among three monospedfic mangrove stands dominated by Sonneratia caseolaris, Kandelia obovata, and Sonneratia apetaia was similar. The abundance of microplastics in the mudflat was similar to that in the forest interior, except for the fact that more fiber was found in the mudflat than in the interior of Sonneratia apetala. This suggested that the dense pneumatophores at the fringe prevented fibers from entering the mangrove forest. The significant positive dependence (p < 0.05) between the density of Sonneratia pneumatophores and the abundance of fibers highlighted the importance of pneumatophores. The abundance of total microplastics, predominantly in the form of fibers, in sediments at the forest fringe (2835 +/- 713 items/kg d.w. and 2070 +/- 4224 items/kg d.w. in Futian and Mai Po, respectively) was higher than that in the forest interior and mudflat There was no difference between the two latter locations in both mangroves, which demonstrated the significance of the fringe effect This paper reports for the first time that the spatial distribution of microplastics in mangrove sediments was affected by plant species, which provides useful information for environmental processes of microplastics in coastal wetlands. (C) 2021 Elsevier B.V. All rights reserved.
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