农业环境科学学报2025，Vol.44Issue(6)：1524-1534,11.DOI:10.11654/jaes.2024-0566
PE和PLA微塑料对洱海北部农田土壤净氮矿化和硝化作用的影响
Effects of PE and PLA microplastics on net nitrogen mineralization and nitrification of farmland soil in the northern Erhai basin
摘要
Abstract
The environmental behavior of microplastics has received extensive attention,and the difference of effects of non-degradable and degradable microplastics on soil net nitrogen mineralization and nitrification in farmland soil is worth exploring.Non-degradable polyethylene(PE)and degradable polylactic acid(PLA)microplastics with different mass fractions(1%,2%and 3%)and particle sizes(1 mm and 3 mm)were added to the farmland soil in northern Erhai basin for a 30-day laboratory incubation experiment.The effects of different microplastics on soil physicochemical properties,net nitrogen mineralization and nitrification rate were investigated.The results showed that:PE and PLA microplastics significantly increased soil nitrate content(P<0.05),and the increase range of soil nitrate content after incubation experiment was 9.64%to 28.76%and 20.75%to 47.21%,respectively.However,PE and PLA reduced the content of ammonium nitrogen in soil,but not to a significant level.The addition of microplastics significantly increased the soil net nitrogen mineralization and nitrification rates(P<0.05),and the net nitrogen mineralization rates(0.50 mg·kg-1·d-1 and 0.63 mg·kg-1·d-1)of PE and PLA treatment were 12.50 times and 15.75 times as much as that of CK treatment(0.04 mg·kg-1·d-1),and the net nitrification rates(0.48 mg·kg-1·d-1 and 0.62 mg·kg-1·d-1)were 12.00 times and 15.50 times as much as that of CK(0.04 mg·kg-1·d-1).The rates of soil net nitrogen mineralization and net nitrification increased first and then decreased with the increase of PE and PLA microplastics concentration.PLA with small particle size can affect soil net nitrogen mineralization and net nitrification rate.The rates of net nitrogen mineralization and nitrification were negatively correlated with pH(P<0.01).The results showed that both PE and PLA could promote net nitrogen mineralization and nitrification of farmland soil,and the promotion effect of degradable microplastics is more obvious than that of non-degradable microplastics.关键词
微塑料/净氮矿化速率/净硝化速率/农田土壤/聚乙烯(PE)/聚乳酸(PLA)Key words
microplastics/netnitrogenmineralizationrate/netnitrificationrate/farmlandsoil/polyethylene(PE)/polylacticacid(PLA)分类
资源环境引用本文复制引用
王鑫,王金蕊,侯磊,王艳霞,李晓琳,梁启斌..PE和PLA微塑料对洱海北部农田土壤净氮矿化和硝化作用的影响[J].农业环境科学学报,2025,44(6):1524-1534,11.基金项目
云南省农业基础研究联合专项面上项目(202301BD070001-090) （202301BD070001-090）
云南省基础研究计划面上项目(202301AT070220) （202301AT070220）
西南林业大学科研启动基金项目(110223015) （110223015）
国家大学生创新创业训练计划项目(202210677015) Yunnan Agricultural Joint Special Project(202301BD070001-090) （202210677015）
Yunnan Fundamental Research Projects(202301AT070220) （202301AT070220）
Southwest Forestry University Research Foundation(110223015) （110223015）
National College Student Training Program for Innovation and Entrepreneurship(202210677015) （202210677015）
