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

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中图分类号：X144：S153 文献标志码：A 文章编号：1672-2043（2025）06-1524-11 doi：10.11654/jaes.2024-0566

Effects of PEand PLA microplastics on net nitrogen mineralization and nitrification of farmland soil in the northern Erhai basin

WANGXin'，WANGJinrui²，HOULei²，WANGYanxia'，LIXiaolin'，LIANGQibin2*

（1.Collgofldteuttsiti;loolot SouthwestForestryUniversity，Kunming650224，China）

Abstract：Theviroentalaviorofcroplastcsaceiedetensieaeto，ndthdifereeoftsofodble anddegradablemicroplasticsonsoiletnitrogenmineralizationandnirificationinfamlandsoilisworthexploringNondegadable polyethylene（PE）and degradable polylactic acid（PLA） microplastics with different mass fractions（ 1% ， 2% and 3% ）and particle sizes（1 mmand3mm）wereaddedtothefarmlandsoil innorthernErhaibasinfora3O-daylaboratoryincubationexperiment.Theffectsof diferentmiroplastisonsoilpysicohicalproperts，ettrgenmeralizatioanditrifcationateereivestigatedesuls showed that：PE and PLA microplastics significantly increased soil nitrate content（ P <0.05），and the increase range of soil nitrate content after incubation experimentwas 9.64% to 28.76% and 20.75% to 47.21% ，respectively.However，PE and PLAreduced thecontentof ammoniumnitrogeninsoilbutnottoasignificantlevel.Theaditionofmicroplasticssignificantlyincreasedthesoiletitrogen mineralization and nitrification rates（ P <0.05），and the net nitrogen mineralization rates 0.50mg⋅kg-1⋅d-1 and 0.63mg⋅kg-1⋅d-1 ）ofPE and PLA treatment were 12.50 times and 15.75 times as much as that of CK treatment （0.04mg⋅kg-1⋅d-1） ，and the net nitrification rates （0.48mg* kg-1⋅d-1 and 0.62mg⋅kg-1⋅d-1， were12.00 timesand15.50 timesasmuchasthat of CK（0.04mg⋅kg-1⋅d-1） .The rates of soil net nitrogenmineralization andnet nitrification increased first andthen decreasedwith theincreaseof PE and PLA microplastics concentrationPLAwithsallparticlesizecanectsoilnetitrognmineralizationandetnitrfiationrateTeratesofogn mineralization and nitrification were negatively correlated with pH（P<0.01） .The results showed that both PE and PLA could promote net nitrogenminealizatioditrificationoffrlandsoilandtepromotionetofegdableicroplatsisoreovioustthatf non-degradable microplastics.

Keywords：microplastics;nitrogenmineraationate;etnitificaonate;famlandsoil;polethlene（PE）;pollacticadPLA）

农业生产过程中使用的塑料大棚、地膜、有机肥和灌溉措施等会导致微塑料在农田土壤中积累[1-3]。（剩余18515字）