数字农科院2.0

Concurrence of microplastics and heat waves reduces rice yields and disturbs the agroecosystem nitrogen cycle

文献类型： 外文期刊

作者： Shuqing Guo;Li Mu;Shan Sun;Xuan Hou;Mingqi Yao;Xiangang Hu

作者机构：

关键词： Climate change;Food;Heat waves;Microplastics;N cycle;Rice

期刊名称： Journal of Hazardous Materials

ISSN： 0304-3894

年卷期： 2023 年 452 卷

页码：

收录情况： SCIE（2023版） ; ; EI（2023版）

摘要： Microplastic pollution and heat waves, as damaging aspects of human activities, have been found to affect crop production and nitrogen (N) cycling in agroecosystems. However, the impacts of the combination of heat waves and microplastics on crop production and quality have not been analyzed. We found that heat waves or microplastics alone had slight effects on rice physiological parameters and soil microbial communities. However, under heat wave conditions, the typical low-density polyethylene (LDPE) and polylactic acid (PLA) microplastics decreased the rice yields by 32.1% and 32.9%, decreased the grain protein level by 4.5% and 2.8%, and decreased the lysine level by 91.1% and 63.6%, respectively. In the presence of heat waves, microplastics increased the allocation and assimilation of N in roots and stems but decreased those in leaves, which resulted in a reduction in photosynthesis. In soil, the concurrence of microplastics and heat waves induced the leaching of microplastics, which resulted in decreased microbial N functionality and disturbed N metabolism. In summary, heat waves amplified the disturbance induced by microplastics on the agroecosystem N cycle and therefore exacerbated the decreases in rice yield and nutrients induced by microplastics, which indicates that the environmental and food risks of microplastics deserve to be reconsidered.

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