Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China.
Sci Total Environ. 2024 Nov 20;952:175885. doi: 10.1016/j.scitotenv.2024.175885. Epub 2024 Aug 29.
Biochar application to amend acidified tobacco-soils can enhance tobacco quality and reduce nitrous oxide (NO) emissions. Microplastics from agricultural mulch are commonly found in cash-crop farmland soils and, together with biochar, affect soil NO emissions. In this study, we applied three types of microplastics (polyethylene, PE; polylactic acid, PLA; polybutylene adipate terephthalate, PBAT) and rice biochar alone or in combination to acidified tobacco planting soil in central China to investigate their effects on soil NO emissions, soil chemical properties, nitrogen-cycle-related functional genes, and microbial functional diversity during a 35-day laboratory incubation period. Significant increases in N₂O emissions were observed with PE and PLA, which raised emissions by 15.96 % and 21.52 %, respectively. Additionally, different microplastics affected soil N₂O emissions through distinct regulatory pathways. Co-application of microplastics and biochar suppressed NO emissions compared to microplastics alone. Biochar mitigates NO emissions mainly by increasing the abundance of the nosZ gene. It can remediate soil contaminated by microplastics and reduce their negative impacts on the soil environment. This study provides deeper insight into the effects of microplastics on soil nitrogen cycling and biochar-mitigated remediation of microplastic-contaminated soil.
生物炭应用于酸化烟田可以提高烟草品质并减少一氧化二氮（N2O）排放。农业覆盖用微塑料通常存在于经济作物农田土壤中，与生物炭一起影响土壤 N2O 排放。本研究在中国中部酸化植烟土壤中单独或组合施用三种类型的微塑料（聚乙烯、PE；聚乳酸、PLA；聚对苯二甲酸丁二醇酯、PBAT）和水稻生物炭，以研究它们对土壤 N2O 排放、土壤化学性质、氮循环相关功能基因和微生物功能多样性的影响，为期 35 天的实验室孵化期。PE 和 PLA 显著增加了 N2O 排放，分别增加了 15.96%和 21.52%。此外，不同的微塑料通过不同的调节途径影响土壤 N2O 排放。与单独使用微塑料相比，微塑料和生物炭的共同应用抑制了 NO 排放。生物炭主要通过增加 nosZ 基因的丰度来减少 NO 排放。它可以修复受微塑料污染的土壤，并减少其对土壤环境的负面影响。本研究深入了解了微塑料对土壤氮循环的影响以及生物炭对微塑料污染土壤的缓解修复作用。
