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He X, Qian Y, Li Z, Yang S, Tian J, Wang Q, Lei J, Qi R, Feng C. Identification of factors influencing the microplastic distribution in agricultural soil on Hainan Island. Sci Total Environ 2023; 874:162426. [PMID: 36842590 DOI: 10.1016/j.scitotenv.2023.162426] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 02/06/2023] [Accepted: 02/19/2023] [Indexed: 06/18/2023]
Abstract
Microplastics (MPs) are ubiquitous in agricultural soils, but to what extent and how environmental factors determine the source and fate of MPs in agricultural soils is not clear. In this study, Hainan Island, which has different climatic conditions, altitudes, and land uses across the island, was selected to investigate the MPs abundance and the shape, size, color, and polymer type of the MPs in agricultural soils. The main focus was on the role of land use type and the identification of environmental influencing factors. The results showed that MPs were detected in all the soil samples across the island, with an abundance range of 20 to 6790 items kg-1 and an average of 417 items kg-1. Fragments (46.8 %), MPs smaller than 0.5 mm (37.8 %), black MPs (48.3 %), and polypropylene MPs (56.8 %) were observed as the dominant MPs species. Significantly higher MPs abundance was found in mulched arable land, and higher contents of fibers and fragments were observed in woodland and paddy lands, respectively. With correlation and redundancy analyses, soil pH, soil organic matter content, and average annual temperature were found to be the main factors influencing the biotic/abiotic fragmentation of MPs. The regional population density, including tourism represented by the night light index, affects the input process of MPs. MPs transport and deposition were found to be affected by altitude, annual precipitation, and soil moisture content. This study represents the first large-scale study of MPs contamination in island agricultural soils and provides important data on the distribution, transport, and fate of MPs.
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Affiliation(s)
- Xiaokang He
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Yibin Qian
- Hainan Research Academy of Environmental Sciences, 571127 Haikou, PR China; National Plot Zone for Ecological Conservation (Hainan) Research Center, 571127 Haikou, PR China
| | - Zhenling Li
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Shuai Yang
- Hainan Research Academy of Environmental Sciences, 571127 Haikou, PR China; National Plot Zone for Ecological Conservation (Hainan) Research Center, 571127 Haikou, PR China
| | - Jinfei Tian
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Qixuan Wang
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Jinming Lei
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Ruifang Qi
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | - Chenghong Feng
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, PR China.
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