Department of Science and Environmental Studies, The Hong Kong Institute of Education, 10 Lo Ping Road, Tai Po, Hong Kong, China.
Department of Social Sciences, The Hong Kong Institute of Education, 10 Lo Ping Road, Tai Po, Hong Kong, China.
Sci Total Environ. 2016 Aug 15;562:658-665. doi: 10.1016/j.scitotenv.2016.04.048. Epub 2016 Apr 22.
Marine plastic debris, including microplastic debris (0.315-5mm) and large plastic debris (>5mm), was collected from 25 beaches in Hong Kong during a wet summer season (June-August 2014) and the following dry winter season (January-March 2015). Wilcoxon signed rank tests were used to compare the abundances and weights of seven categories of plastic debris between the two seasons. The results showed that the abundances and weights were significantly higher (p<0.05) in the wet season than in the dry season. Additionally, seasonal differences were detected only at the sites that were located on the west coast of Hong Kong and not at the sites on the east coast. These results suggest that the Pearl River Estuary on the west of Hong Kong plays a prominent role in the abundance and distribution of plastic debris in Hong Kong. In addition, the study indicates that estimates of microplastic abundance may be biased if samples are collected only during the wet or dry season if the sample locations are strongly influenced by a seasonal variation of riverine inputs, such as from the Pearl River.
在一个潮湿的夏季（2014 年 6 月至 8 月）和随后的干燥冬季（2015 年 1 月至 3 月）期间，从香港的 25 个海滩收集了海洋塑料碎片，包括微塑料碎片（0.315-5 毫米）和大塑料碎片（>5 毫米）。使用 Wilcoxon 符号秩检验比较了两个季节七种类型塑料碎片的丰度和重量。结果表明，湿季的丰度和重量明显高于干季（p<0.05）。此外，仅在位于香港西海岸的地点检测到季节性差异，而在位于香港东海岸的地点则没有。这些结果表明，香港西部的珠江口在香港塑料碎片的丰度和分布中起着重要作用。此外，该研究表明，如果仅在潮湿或干燥季节收集样本，并且样本地点受到季节性河流输入（如来自珠江）的强烈影响，那么对微塑料丰度的估计可能存在偏差。
