Spatial distribution and migration mechanism of microplastics in the surface sediments of the southern Pearl River Estuary
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摘要: 海洋环境中的微塑料污染是一个普遍性的全球问题,珠江口海域则是我国海洋微塑料污染的典型区域。为探究珠江口海域微塑料的空间分布及运移机制,对珠江口南部海域55个站位的表层沉积物样品进行处理分析,对样品中的微塑料进行鉴定统计。结果表明: ①研究区微塑料丰度的变化范围为0~47.77 items/kg,微塑料空间分布不均,在磨刀门至大箕湾海域、香洲湾至桂山岛海域富集,与我国南海其他海域相比,整体处于较低水平; ②研究区微塑料来源主要是河道两侧人类活动,在潮流和径流的双重驱动下,磨刀门水道水体中携带的微塑料,在磨刀门至大箕湾口海域卸载并积累,珠江口水体携带的微塑料则在香洲湾至桂山岛海域发生卸载并积累。研究结果可为我国近海环境污染研究提供参考,同时为监测中国南方海洋资源中的微塑料提供数据。Abstract: Microplastic pollution in the marine environment is a common global problem, and Pearl River Estuary is a typical area of marine microplastic pollution in China. In order to explore the spatial distribution and migration mechanism of microplastics in Pearl River Estuary, the authors processed and analyzed surface sediment samples from 55 stations in the southern Pearl River Estuary. And the microplastics in the samples were identified and counted. The research results are as follows. (1) The microplastics abundance in the study area varied in the range of 0~47.77 items/kg, with uneven spatial distribution, and it was enriched in the sea area from Modaomen to Daji Bay and from Xiangzhou Bay to Guishan Island. The microplastics abundance was at a low level compared with other waters in the South China Sea. (2) The sources of microplastics in the study area were mainly human activities on both sides of the river. Driven by the dual drive of tidal flow and runoff, the microplastics carried in the water body of the Modaomen channel were unloaded and accumulated in the sea area from Modaomen to Dajiwan Estuary. While the microplastics carried by the water body of the Pearl River Estuary were unloaded and accumulated in the sea area from Xiangzhou Bay to Guishan Island. The results of this study could provide some references for the study of environmental pollution in China's coastal waters, and also provide some data for monitoring microplastics in the marine resources in the southern areas of China.
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Key words:
- Pearl River Estuary /
- microplastics /
- sarface sediments /
- spatial distribution /
- migration mechanisms
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