干旱区生态环境知识资源中心(Arid): Abundances of agricultural microplastics and their contribution to the soil organic carbon pool in plastic film mulching fields of Xinjiang, China

Arid

DOI	10.1016/j.chemosphere.2023.137837
	Abundances of agricultural microplastics and their contribution to the soil organic carbon pool in plastic film mulching fields of Xinjiang, China
	Yu, Yongxiang; Zhang, Zihan; Zhang, Yanxia; Jia, Hongtao; Li, Yaying; Yao, Huaiying
通讯作者	Yao, HY
来源期刊	CHEMOSPHERE
ISSN	0045-6535
EISSN	1879-1298
出版年	2023
卷号	316
英文摘要	Plastic mulched agricultural fields in Xinjiang are regarded as potential hotspots of microplastic (MP) contamination in China, whereas the abundance of MPs in this region is still unclear. As a carbonaceous material, current conventional methods for measuring soil organic carbon (SOC) generally do not separate the MPs from soils, which probably overestimated the soil carbon (C) sequestration. In this study, 77 agricultural soil samples under plastic film mulching were collected in Xinjiang. Afterward, the average abundance of agricultural MPs and the contribution of microplastic-carbon (MP-C) to the SOC pool were evaluated. The abundance of MPs was 12,589 pieces kg- 1 soil (ranging from 4198 to 47,420 pieces kg- 1 soil), and small-sized (<0.5 mm) plastic particles accounted for 93.3% of the total MPs. Interestingly, the soil salt content was positively related to the proportion of 0.1-0.5 mm MP but negatively correlated with the proportion of 0.02-0.1 mm MP, indicating that soil salinization probably controlled the degradation process of plastic residues. The average content of MP-C in the 0-20 cm layer was 25.33 kg ha- 1 (ranging from 1.60 to 192.57 kg ha -1), which had a contribution of 1.59%0 (ranging from 0.05 to 14.24%0) to the SOC pool. Accordingly, we roughly estimated that the MP-C storage (0-20 cm layer) was approximately 88.66 Gg in the plastic film mulching fields of Xinjiang. Although MP is undeniably organic C, this environmental pollution cannot be regarded as true soil C storage, which induces the over-estimation of soil C sequestration in agricultural fields. Therefore, our results highlighted that MP-C should be subtracted when estimating SOC sequestration in plastic film mulching fields of Xinjiang.
英文关键词	Soil microplastics Plastic film Organic carbon Farmland Arid region
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000962932100001
WOS关键词	POLYETHYLENE ; DEGRADATION ; SEA
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395741
推荐引用方式 GB/T 7714	Yu, Yongxiang,Zhang, Zihan,Zhang, Yanxia,et al. Abundances of agricultural microplastics and their contribution to the soil organic carbon pool in plastic film mulching fields of Xinjiang, China[J],2023,316.
APA	Yu, Yongxiang,Zhang, Zihan,Zhang, Yanxia,Jia, Hongtao,Li, Yaying,&Yao, Huaiying.(2023).Abundances of agricultural microplastics and their contribution to the soil organic carbon pool in plastic film mulching fields of Xinjiang, China.CHEMOSPHERE,316.
MLA	Yu, Yongxiang,et al."Abundances of agricultural microplastics and their contribution to the soil organic carbon pool in plastic film mulching fields of Xinjiang, China".CHEMOSPHERE 316(2023).