| 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. |
| 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 |
| 投稿时间：2024-07-04 |
| DOI：10.11654/jaes.2024-0566 |
| 中文关键词: 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） |
| 英文关键词: microplastics net nitrogen mineralization rate net nitrification rate farmland soil polyethylene（PE） polylactic acid（PLA） |
| 基金项目:云南省农业基础研究联合专项面上项目（202301BD070001-090）；云南省基础研究计划面上项目（202301AT070220）；西南林业大学科研启动基金项目（110223015）；国家大学生创新创业训练计划项目（202210677015） |
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| 中文摘要: |
| 为探究不同微塑料对土壤理化性质、净氮矿化和净硝化速率的影响，以洱海北部农田土壤为研究对象，添加不同质量分数（1%、2%和3%）、粒径（1 mm和3 mm）的不可降解聚乙烯（PE）和可降解聚乳酸（PLA）微塑料开展为期30 d的室内培养实验。结果表明：添加PE和PLA微塑料能显著增加土壤硝态氮含量（P<0.05），培养结束后土壤硝态氮含量的增幅范围分别为9.64%~28.76%和20.75%~47.21%；而添加PE和PLA后土壤铵态氮含量未显著降低。添加微塑料能显著提高土壤净氮矿化速率和净硝化速率（P<0.05），在培养结束后，添加PE和PLA处理的净氮矿化速率（0.50 mg·kg-1·d-1和0.63 mg·kg-1·d-1）是CK（0.04 mg·kg-1·d-1）的12.50倍和15.75倍，净硝化速率（0.48 mg·kg-1·d-1和0.62 mg·kg-1·d-1）是CK（0.04 mg·kg-1·d-1）的12.00倍和15.50倍。土壤净氮矿化速率和净硝化速率随PE和PLA微塑料添加量的增加呈先升高后降低的变化规律；小粒径的PLA更能影响土壤净氮矿化速率和净硝化速率；土壤净氮矿化速率和净硝化速率与pH呈极显著负相关（P<0.01）。研究表明，PE和PLA均能促进农田土壤净氮矿化和硝化作用，且可降解微塑料比不可降解的促进作用更明显。 |
| 英文摘要: |
| 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 contentafter 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. |
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