期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 835, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.155434
关键词
Plastic debris; Remote Lake; Transport; Sedimentation; Hydrological processes; Environmental factors
资金
- Ministry of Science and Technology [2019QZKK0605]
- National Key R&D Program of China [2017YFC0505803]
- National Natural Science Foundation of China [41761144078, 41705132, 41675130]
- Project of Qinghai Science & Technology Department [2018-ZJ-958Q]
- High Level Foreign Experts program - State Administration of Foreign Experts Affairs, the P.R. China [GDT20143200016]
- Einstein Professor Programof the Chinese Academy of Sciences
- Canada Research Chair program
- Distinguished Visiting Professorship in the Department of Environmental Sciences at Baylor University, Waco, Texas, USA
A study conducted on Qinghai Lake in China, the largest brackish lake on the Tibetan Plateau, found that the distribution of microplastics (MPs) with size <5 mm varied from the lakeshore to the center. The distribution was influenced by river inflow, tourism, and minimal human activity. Qinghai Lake was classified as moderately polluted with MPs based on the abundance in the sediments. The dominant characteristics of MPs in the sediments were transparent, fiber-shaped polypropylene.
Although several studies of microplastics (MPs) with size <5 mm in lake sediments focused on lakeshore areas, there have been no studies of distributions of MPs from lakeshores to the center of a lake. To test our hypothesis that MPs decrease from lakeshore to the center, a study was conducted on the largest brackish lake on the remote and high-altitude Tibetan Plateau, China. Abundances and characteristics of MPs in 14 samples of surface sediment collected from a river bay, a lake bay, and a lake central area were investigated. Distributions were influenced by river inflow, tourism, and minimal activity of humans, respectively around Qinghai Lake. The mean abundance of MPs in sediments of Qinghai Lake was 393 +/- 457 items/kg, dry mass (dm). Based on the range of MP abundances in surface sediments of lakes worldwide, Qinghai Lake was classified as being moderately polluted with MPs. The dominant color, shape, size, and polymer type of MPs in sediments were transparent, fiber, 0.05-1 mm, and polypropylene, respectively. The river bay had a mean abundance of MPs two-fold greater than either the bay or central area of the lake. This indicates that the river catchment caused more pollution with MPs, while the central area of the lake was not a sink for MPs. Spatial trends of MPs in sediments from the shore to the center of the lake differed among areas, and were significantly related to wind, lake current, sedimentation rate, water- and sediment-properties, water depth, and proximity to land sources of MPs.
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