低分子量聚乙烯对土壤氮含量及相关酶的影响

环境降解地膜可在较短时间内碎片化，并进一步由碎片降解为粉末状的低分子量聚乙烯（LMWPE）。利用不同分子量聚乙烯粉末模拟环境降解地膜降解后的聚乙烯组分，将3种不同分子量LMWPE（M1=2000、M2=5000、M3=100000）添加到盆栽土壤中种植小麦，测试分析小麦不同生育期土壤氮含量及两种关键酶活性变化，为环境降解地膜的环境安全性评估提供实验依据。结果表明：处理组土壤全氮、碱解氮含量在小麦分蘖期、孕穗期、开花期等显著低于对照组，土壤脲酶活性在拔节期至灌浆期受到显著抑制，不同分子量LMWPE处理对小麦各个生育期土壤蛋白酶活性的影响未达显著水平。LMWPE可在一定程度上降低土壤供氮能力，土壤氮素转换受到一定程度的抑制。以LMWPE为原料的环境降解地膜的环境安全性有待进一步探究。

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