Long-term plastic film mulching promotes microplastic accumulation and alters gross nitrogen transformation in soil

IF 4.8 2区 农林科学 Q1 SOIL SCIENCE
Jinrui Zhang , Kai Wang , Tianxiang Hao , Jinbo Zhang , Christoph Müller , Perrine Florent , Hong Yan , Siyang Ren , Kaijing Qu , Kaige Ren , Jingjing Li , Yiting Su , Fan Ding , Jingkuan Wang , Xihe Wang , Yanling Chen , Shihua Lv , David R. Chadwick , Davey L. Jones , Xuejun Liu
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引用次数: 0

Abstract

While long-term plastic film mulching (LFM) of farmland can improve the yield and quality of crops, it also poses ecological risks through the accumulation of microplastics (MPs) in soil and alterations in soil nitrogen (N) cycling. However, no systematic studies (based on long-term experiments) have studied the effects of LFM on both soil MPs accumulation and gross N transformations. In this study, topsoils (0–20 cm) were collected from four LFM farmlands in Xinjiang, Liaoning, Sichuan, and Shandong provinces of China. The 15N isotope pool dilution method and Ntracebasic model were applied to quantify the impact of LFM on soil gross N transformation rates. Our results showed that LFM significantly increased the accumulation of MPs, particularly in the 0–10 cm layer. The gross N transformation rates varied among sites, reflecting regional differences in soil type. Mineralization rates increased in Xinjiang, Liaoning, and Sichuan under LFM, while microbial assimilation and autotrophic nitrification decreased in Xinjiang. In Sichuan, reduced soil nitrification potential led to low levels of mineral N (NH4+-N and NO3-N) retention. Furthermore, in Shandong, LFM decreased the mineralization potential of recalcitrant organic N but significantly enhanced heterotrophic nitrification. To improve predictions of agroecosystem N cycling, we show with this study that it is important to consider soil differences which drive gross N transformation rates associated with LFM.

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来源期刊
Applied Soil Ecology
Applied Soil Ecology 农林科学-土壤科学
CiteScore
9.70
自引率
4.20%
发文量
363
审稿时长
5.3 months
期刊介绍: Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.
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