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| Quantity and distribution of microplastics in film mulching farmland soil of Northwest China |
| Received:May 07, 2020 |
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| KeyWord:microplastics;distribution characteristics;farmland soil;plastic film mulch |
| Author Name | Affiliation | E-mail | | CHENG Wan-li | Key Laboratory for Efficient Utilization of Water Resources in Dryland Areas in Gansu Province/Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | | FAN Ting-lu | Key Laboratory for Efficient Utilization of Water Resources in Dryland Areas in Gansu Province/Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China
Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | 13893425734@163.com | | WANG Shu-ying | Key Laboratory for Efficient Utilization of Water Resources in Dryland Areas in Gansu Province/Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | | LI Shang-zhong | Key Laboratory for Efficient Utilization of Water Resources in Dryland Areas in Gansu Province/Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | | ZHANG Jian-jun | Key Laboratory for Efficient Utilization of Water Resources in Dryland Areas in Gansu Province/Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | | ZHAO Gang | Key Laboratory for Efficient Utilization of Water Resources in Dryland Areas in Gansu Province/Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | | WANG Lei | Key Laboratory for Efficient Utilization of Water Resources in Dryland Areas in Gansu Province/Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | | | DANG Yi | Key Laboratory for Efficient Utilization of Water Resources in Dryland Areas in Gansu Province/Dryland Agriculture Institute, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China | |
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| Abstract: |
| In this study, 81 soil samples from the 0~30 cm layer were collected from 27 mulch farmlands in 9 counties of Gansu Province and north Shaanxi. The density floatation method using distilled water and heating identification was combined with optical microscope scanning to extract light-density microplastics (MiPs)from the soil samples, and count the number of pieces and sizes of these MiPs. The results showed that the MiPs were highly abundant in film mulched farmland soils in Northwest China. Their concentrations ranged from 5.8×102~1.189×104 pieces·kg-1, averaging at (5.09±1.21)×103 pieces·kg-1. The MiPs covered an area of 82~4155 mm2·kg-1, with a mean of (1.04±0.20)×103 mm2·kg-1. The MiPs were sized 0.19 mm2·piece-1 on average, the biggest size being 7.11 mm2·piece-1. The MiPs were classified into 5 groups by size, of which in the size 0~0.05 and 0.05~0.3 mm2·piece-1 the proportion of abundance and size respectively accounted for 38.8% and 43.6%, 8.7% and 36.5%, however in the size 0.3~0.6 and 0.6~1.0 and >1.0 mm2·piece-1 were 10.5%, 4.6% and 2.5%, 22.1%, 16.8% and 15.9%, respectively, implying that the abundance of the MiPs increased with the reduction in size. The percentage of MiPs sized 0~0.05 mm2·piece-1 in the plastic film mulch increased in abundance (by 44.9%)and area (85.2%)over a time period of 5~28 years. In contrast, the corresponding values for the MiPs sized > 0.3 mm2·piece-1 decreased significantly. These results clearly demonstrate that over the long term, the sizes of MiP pieces in film mulch farmland are reducing, whereas their abundances are increasing, leading to worsening pollution. |
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