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Liu Z, Li Y, Wang J, Wu L, Liu Z, Wei H, Zhang J. Unraveling consequences of the co-exposure of polyethylene microplastics and acid rain on plant-microbe-soil system. Chemosphere 2022; 307:135941. [PMID: 35940419 DOI: 10.1016/j.chemosphere.2022.135941] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/03/2022] [Accepted: 08/01/2022] [Indexed: 06/15/2023]
Abstract
Emerging microplastics (MPs) pollution and continuing acid rain (AR) co-exist in terrestrial ecosystems, and are considered as threats to ecosystems health. However, few data are available on MPs-AR interactions in plant-microbe-soil systems. Here, a microcosm experiment was manipulated to elucidate the co-exposure of polyethylene MPs (PE MPs; 1%, 5% and 10%) and AR (pH 4.0) on soil-lettuce system, in which the properties of soil and lettuce, and their links were explored. We found that 10% PE MPs increased soil CO2 emission and its temperature sensitivity (Q10) in combination with AR, while 1% PE MPs reduced soil CO2 emission irrespective of AR. PE MPs addition did not influence lettuce production (total biomass) though its photosynthesis was affected. PE MPs exerted negative impact on soil water availability. PE MPs treatments increased NH4+-N content of soil without AR, and dissolved organic carbon content of soil sprayed with AR. 10% PE MPs combined with AR reduced soil microbial biomass, while soil microbial community diversity was not affected by PE MPs or AR. Interestingly, 10% PE MPs addition altered soil microbial community structure, and promoted the complexity and connectivity of soil microbial networks. 5% and 10% PE MPs addition decreased soil urease activity under AR, but this was not the case without AR. These findings highlight the critical role of AR in regulating PE MPs impacts on plant-microbe-soil ecosystems, and the necessity to incorporate other environmental factors when evaluating the actual impacts or risks of MPs pollution in terrestrial ecosystems.
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Affiliation(s)
- Ziqiang Liu
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Eco-circular Agriculture, South China Agricultural University, Guangzhou, 510642, China; Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China
| | - Yazheng Li
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Eco-circular Agriculture, South China Agricultural University, Guangzhou, 510642, China; Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China
| | - Jing Wang
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Eco-circular Agriculture, South China Agricultural University, Guangzhou, 510642, China; Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China
| | - Lizhu Wu
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Eco-circular Agriculture, South China Agricultural University, Guangzhou, 510642, China; Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China
| | - Zhenxiu Liu
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China
| | - Hui Wei
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Eco-circular Agriculture, South China Agricultural University, Guangzhou, 510642, China; Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China; Guangdong Engineering Technology Research Centre of Modern Eco-agriculture and Circular Agriculture, South China Agricultural University, Guangzhou, 510642, China; Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou, 510642, China.
| | - Jiaen Zhang
- Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Provincial Key Laboratory of Eco-circular Agriculture, South China Agricultural University, Guangzhou, 510642, China; Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China; Guangdong Engineering Technology Research Centre of Modern Eco-agriculture and Circular Agriculture, South China Agricultural University, Guangzhou, 510642, China; Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou, 510642, China.
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