[Effects of Microplastics on Soil N2O Emission and Nitrogen Transformations from Tropical Agricultural Soils].

Q2 Environmental Science Huanjing Kexue/Environmental Science Pub Date : 2024-10-08 DOI:10.13227/j.hjkx.202310172
Xiao-Tong Wang, You-Feng Leng, Jun-Jiao Wang, Xiao-Min Huang, Ya-Jun Fu, Chang-Hua Fan, Wen-Long Gao, Wen Zhang, Zi-Yu Ning, Miao Chen
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Abstract

A widespread concern had been there regarding soil ecological and environmental problems caused by microplastic pollution in agricultural soils. A controlled laboratory incubation experiment was performed to examine the effects of different types of microplastics on soil properties, N2O emissions, and nitrogen (N) transformations in tropical arable soils from a pepper-corn cropping system in Hainan Province. Three treatments were done: soil without microplastics (CK) and soil amended with 5% of polyethylene (PE) or with 5% of polybutylene adipate co-terephthalate (PBAT). The results showed that both types of microplastic addition increased soil pH, soil organic carbon (SOC), and dissolved organic carbon (DOC) contents, with stronger treatment effects observed for PBAT than those for the PE treatment. In addition, the PE and PBAT treatments increased soil ammonium nitrogen (NH4+-N) contents by 66.07% and 119.65% and decreased nitrate nitrogen (NO3--N) contents by 8.56% and 29.68%, respectively. Compared to those in the CK treatment, the addition of PBAT significantly increased soil N2O emissions by 254.92% (P < 0.05), whereas that of PE produced no significant effects. Furthermore, both the PE and PBAT treatments increased soil net nitrogen mineralization rate (NMR) and decreased soil net nitrification rate (NNR), with more obvious treatment effects observed in PBAT than in the PE treatment. PBAT addition increased the abundance of ureC, while PE had no significant effects. Microplastic addition reduced the abundance of nitrifying gene abundances (AOA-amoA, AOB-amoA, and nxrA), with more obvious treatment effects found in the PBAT treatment. Further, PBAT addition significantly increased the gene abundances of nirK, nirS, nosZ, and fungal nirKP < 0.05), whereas the addition of PE had no significant effect on those gene abundances. Soil N2O emissions had positive relationships with NH4+-N intensity, pH, DOC, SOC, and nirS abundance. In conclusion, biodegradable microplastics addition produced stronger influences on soil properties and N transformations than the non-biodegradable one in tropical arable soils and aggravated soil N2O emissions mainly by promoting denitrification.

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[微塑料对土壤一氧化二氮排放和热带农业土壤氮转化的影响]。
农业土壤中的微塑料污染所造成的土壤生态和环境问题一直受到广泛关注。为了研究不同类型的微塑料对海南省胡椒-玉米种植系统中热带耕地土壤性质、一氧化二氮排放和氮(N)转化的影响。试验共进行了三种处理:不含微塑料的土壤(CK)和添加 5%聚乙烯(PE)或 5%聚丁烯(PB)的土壤。或 5%的聚己二酸丁二醇酯(PBAT)的土壤。结果表明,添加这两种微塑料都会增加土壤 pH 值、土壤有机碳(SOC)和溶解有机碳(DOC)含量。和溶解有机碳(DOC)含量,其中 PBAT 的处理效果比 PE 的处理效果更强。此外,PE 和 PBAT 处理还增加了土壤铵态氮(NH4+-N)含量分别增加了 66.07% 和 119.65%,硝态氮(NO3-N)含量分别降低了 8.56% 和 29.68%。与 CK 处理相比,添加 PBAT 显著增加了土壤中 N2O 的排放量,增幅达 254.92% (P < 0.05),而添加 PE 则无显著影响。此外,PE 和 PBAT 处理都增加了土壤净氮矿化率(NMR)PBAT比PE的处理效果更明显。添加 PBAT 会增加尿素 C 的丰度,而添加 PE 则无明显影响。微塑料的添加降低了硝化基因(AOA-amoA、AOB-amoA 和 nxrA)的丰度,其中 PBAT 处理的效果更为明显。此外,添加 PBAT 能显著提高 nirK、nirS、nosZ 和真菌 nirK 的基因丰度(P < 0.05),而添加 PE 对这些基因丰度没有显著影响。土壤 N2O 排放与 NH4+-N 强度、pH 值、DOC、SOC 和 nirS 丰度呈正相关。总之,在热带耕地土壤中添加可生物降解的微塑料比添加不可生物降解的微塑料对土壤性质和氮转化的影响更大,并且主要通过促进反硝化作用加剧了土壤中 N2O 的排放。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Huanjing Kexue/Environmental Science
Huanjing Kexue/Environmental Science Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
期刊最新文献
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