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Environmental risk of microplastics after field aging: Reduced rice yield without mitigating yield-scale ammonia volatilization from paddy soils

Environmental Pollution 2022 17 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 35 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Yuanyuan Feng, Yuanyuan Feng, Lanfang Han Yuanyuan Feng, Lanfang Han Yuanyuan Feng, Yuanyuan Feng, Lanfang Han Xuebo Zheng, Lanfang Han Lanfang Han Lanfang Han Lanfang Han Lanfang Han Lanfang Han Wenjing Song, Lanfang Han Lanfang Han Lanfang Han Lanfang Han Yuanyuan Feng, Lanfang Han Wenjing Song, Yuanyuan Feng, Yuanyuan Feng, Yuanyuan Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yuanyuan Feng, Shudong Ding, Lanfang Han Lanfang Han Yanfang Feng, Wenjing Song, Yuanyuan Feng, Lanfang Han Lanfang Han Lanfang Han Lanfang Han Lanfang Han Yanfang Feng, Yanfang Feng, Shudong Ding, Yanfang Feng, Lanfang Han Lanfang Han Yuanyuan Feng, Lanfang Han Yuanyuan Feng, Yuanyuan Feng, Yuanyuan Feng, Yanfang Feng, Yuanyuan Feng, Lanfang Han Yuanyuan Feng, Yanfang Feng, Yuanyuan Feng, Lanfang Han Xuebo Zheng, Yanfang Feng, Jianxin Dong, Yuanyuan Feng, Lanfang Han Lanfang Han Xuebo Zheng, Yuanyuan Feng, Yuanyuan Feng, Lanfang Han Yuanyuan Feng, Yuanyuan Feng, Yanfang Feng, Lanfang Han Yuanyuan Feng, Yanfang Feng, Yuanyuan Feng, Yuanyuan Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Yanfang Feng, Lanfang Han Yanfang Feng, Yanfang Feng, Lanfang Han

Summary

Researchers conducted field aging experiments with polystyrene and polyethylene microplastics and biochar in paddy soils, finding that field-aged microplastics reduced rice yield without mitigating ammonia volatilization, indicating that aged microplastics pose ongoing environmental risks to paddy ecosystem nitrogen cycling and crop production.

Polymers

PAN PE

Body Systems

Reproductive

Microplastics (MPs, <5 mm) are enriched in paddy ecosystems as emerging environmental pollutants. Biochar (BC) is a controversial recalcitrant carbon product that poses potential environmental risks. The presence of these two exogenous organic substances has been demonstrated to have impacts on soil nitrogen cycling and crop production. However, the after-effects of MPs and BC on soil ammonia (NH) volatilization and rice yield after field aging remain unexplored. In this study, two common MPs, including polyethylene (PE) and polyacrylonitrile (PAN), and BC were selected for rice growing season observations to study the impacts on soil NH volatilization and rice yield after field aging. The results showed that the reduction of cumulative soil NH losses by MPs was around 45% after one-year field aging, which was within the range of 40-57% in the previous rice season. Abatement of NH volatilization by MPs mainly occurred in basal fertilization and was related to floodwater pH. Besides, the reduction rate of NH volatilization by BC and MPs + BC was enhanced after field aging (63% and 50-57%) compared to that in the previous rice season (5% and 11-19%), with the abatement process occurring in the first supplementary fertilization. There was a significant positive correlation between cumulative NH volatilization and soil urease activity. Notably, field aging removed the positive effect of MPs and MPs + BC in reducing yield-scale NH losses in the previous rice season (∼62%). Furthermore, despite BC affecting rice yield insignificantly after field aging, the presence of MPs led to a significant 17-19% reduction in rice yield. Our findings reveal that differences in the after-effects of BC and MPs in field aging emerge, where the negative impacts of MPs on soil NH abatement and crop yield are progressively becoming apparent and should be taken into serious consideration.

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