|
| Soil microplastic pollution and distribution characteristics in a typical cotton field in northern Xinjiang, China |
| Received:March 03, 2023 |
| View Full Text View/Add Comment Download reader |
| KeyWord:cotton field in northern Xinjiang;soil microplastic;distribution characteristic;ecological risk |
| Author Name | Affiliation | E-mail | | SUN Xia | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Key Laboratory of Soil and Plant Ecological Process, Xinjiang, Urumqi 830052, China | | | GOU Yanru | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | YAN Han | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | TANG Qingfeng | Institute of Analysis and Testing of Beijing Institute of Science and Technology(Beijing Physical and Chemical Analysis and Testing Center), Beijing 100089, China | tangqingfeng@bcpca.ac.cn | | YANG Zailei | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Key Laboratory of Soil and Plant Ecological Process, Xinjiang, Urumqi 830052, China | | | JIA Hongtao | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Key Laboratory of Soil and Plant Ecological Process, Xinjiang, Urumqi 830052, China | jht@xjau.edu.cn |
|
| Hits: 353 |
| Download times: 256 |
| Abstract: |
| In order to study the soil microplastic pollution and distribution characteristics in typical areas of cotton cultivation in northern Xinjiang, in April 2021, we collected soil samples from different depths(0-10, 10-20 cm, and 20-30 cm) from a field that had been subjected to film mulching for different lengths of time(0, 5, 10, 20 years, and 30 years). Analysis of the samples revealed that the abundance of microplastics in the soil of the cotton field ranged from 1 565 items·kg-1 to 3 560 items·kg-1, and showed an increasing trend with a longer period of time under film mulching.The degree of correlation between the amount of agricultural film mulch and the abundance of microplastics gradually decreased, whereas the degree of correlation between the abundance of microplastics and the amount of agricultural film mulch in the 10-30 cm soil layer was high. There were four types of soil microplastic, namely film, debris, fibers, and foam. The microplastics differed in color, with transparent white, black, and yellow being the most common, accounting for 69.02%, 14.78%, and 6.49% of the total microplastics, respectively. Other colors contributed to the remaining 9.71%. The size of microplastic particles decreased with an increase in coating life, with the largest fraction being those microplastics with particle size of <0.5 mm. Analysis of random samples using Fourier attenuated total reflection infrared spectroscopy revealed that the main components of soil microplastics in the study area were polyethylene(45%), polypropylene(20%), and polyamide(16%). The soil microplastic pollution index for soils subjected to film mulching for a different number of years ranged from 1.70 to 2.57, which increased with an increase in the length of time under film mulching. The microplastic pollution load index in the study area reached 2.09, indicating that the microplastic pollution had reached a severe level. The findings of this study reveal different extents of microplastic pollution in the study area, and accordingly the ecological risks posed by microplastic pollution should be assessed. |
|
|
|
