不同微塑料类型、粒径及浓度对酸性土壤N₂O排放的影响

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关键词：微塑料； N20 排放；土壤氮转化；土壤理化性质；酸性土壤 中图分类号：X144；X505 文献标志码：A 文章编号：1672-2043（2025）09-2441-13 doi：10.11654/jaes.2024-0834

Abstract：Thisstudyaimstoinvestigatetheefectsofvariousmicroplasticcharacteristicsonsoilnitrogen transfomationandNO emisions.TheacidicCameliaoleiferasoilsassudiedject，a45dlaboratoryincubationexperimentwasconductedicludnga control group withoutmicroplasticadition（CK）andtreamentgroups withdiferenttypes（polyetylene（PE），polyinlchlode（VC）， polylactic acid（PLA），and polyhydroxyalkanoates（PHA））），sizes（ 150μm and 2-4 mm），and concentrations （ 1% ， 5% ，and 10% ）of microplsticetialldilge，ss netnitrogenmieralizationate（N）andnnitrificationrate（N）.Tesefdingsindicatedthatetyp，size，andonctrationof microplastics significantly affected N2O emissions.For 150 μm⋅ -size biodegradable microplastics，PHA treatment exhibited the highest soil cumulative N2O emissions，reaching（490.49±56.04） ng⋅g-1⋅h-1 ，whileNMRandNNRwere 92.1% and 91.9% higher than the control， respectively.orthe-4mmsize，trditionalmicroplasticsspeciallyE，producedthehighestcumulativeNOemissionswhich increased with concentration.However，PE treatment resulted in a 27.29% lowerNMR compared to the control，while biodegradable microplasticscosistentlyshowedthehighestNNRacrossconcentrations，significantlyexcedingthecontrolby3196%.Threforete distinctharacteristicfmicroplasticsplayacucialoleinifluencngnettrogenmieralizationadnitrificatioate，lls N2O emissions，inacidic Camelliaoleifera soils.

Keywords：microplastics; N2O emissions; soil nitrogen transformation; soil properties; acidic soil

近年来，土壤环境中微塑料的存在、转化及其引发的生态风险已成为生态学研究的热点。（剩余26263字）