菲在长期施肥黑土团聚体中的老化行为

Long-Term Fertilization on the Behavior of Aging of the Phenanthrene in the Black Soil Aggregates

在东北黑土区长期肥料试验定位监测田采集[化肥与有机肥配施(NPOM)、不施肥(NF)]的表层(0～20 cm)土壤样品,用室内模拟培养的方法研究了菲在黑土及其不同粒径团聚体中的老化行为及其影响因素的溯源分析.结果表明,老化前期>2 mm粒径组团聚体是优先吸附剂,而老化后期<0.053 mm粒径组的团聚体是优先吸附剂.在120 d的老化周期内,0.25～0.053 mm和0.25～2 mm粒径组的提取率无显著差异.NPOM处理原状土中结合残留态菲为31.13%,而NF处理原状土中结合残留态菲为27.73%,菲在NPOM和NF处理中老化平均速率分别为0.26%.d-1和0.23%.d-1.经对5个影响结合残留态菲的含量的相关指标进行主成分分析,结果表明有机碳含量、比表面积是影响结合残留态菲含量最主要因子.因此,长期施用有机肥后形成的土壤结构有利于菲的老化,从而降低菲在土壤中的活性和毒性.

The soil samples were collected from the surface（0-20 cm） soil of the long-term fertilizer experiments in black soil areas in Northeast Location Monitoring Field[fertilizers and organic fertilizers（NPOM）,no fertilization（NF）],and indoor culture method was adopted to study the behaviour of aging of the phenanthrene different size of soil aggregates and its contributing factors of aging source analysis.The results show that in the beginning of the aging 2 mm aggregate fraction was a priority adsorbent,while last stage of the aging 0.053 mm aggregate fraction was the preferred adsorbent.In the 120-day aging period,the extraction rate of 0.25-0.053 mm and 0.25-2 mm aggregate fraction had no significant difference.The phenanthrene residual content in undisturbed soil of NPOM treatment was 31.13%,while in the NF treatment residual content of undisturbed soil was 27.73%.Average rates of the phenanthrene aging in the NPOM and NF treatments was 0.26%·d-1 and 0.23%·d-1.The five major influence factors of the combination of content of the residual phenanthrene based on principal component analysis were analyzed,the results showed that the organic carbon and specific surface area were the mainly factors combined with residual content of phenanthrene.As a consequence,Long-term application of fertilizers was in favour of the aging behaviour of phenanthrene,thereby reducing the activity and toxicity of phenanthrene in the black soil.