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中文摘要：
多环芳烃（PAHs）在土壤不同活性有机质库中的分配会影响它们在土壤中的迁移和生物有效性。本研究采用土壤有机无机复合体的分组方法，分离出以游离态有机物质存在的轻组和以有机无机复合体存在的重组，研究了15种美国环境保护署（USEPA）优控的PAHs在土壤轻组和重组以及重组结合态腐殖质不同组分中的分配特征。结果表明，轻组中PAHs总量的含量范围为1．30×10^4～1．07×10^5μgkg^-1，远远高于PAHs总量的含量为221.7～297．8μgkg^-1的重组。土壤中轻组的含量虽然只有0.4％～2．3％，但它结合的PAHs量却占土壤中PAHs总量的31.5％～69．5％。重组中PAHs含量主要分布在紧结态腐殖质中，占重组PAHs总量71．2％～87．2％。结合态腐殖质不同组分中PAHs的含量与它们有机碳的含量呈显著性正相关（P〈0.01），紧结态腐殖质对PAHs的富集能力显著高于稳结态和松结态腐殖质。PAHs污染土壤的环境风险可能主要在于轻组结合的PAHs。
英文摘要：
Distribution of polycyclic aromatic hydrocarbons （PAHs） among soil organic matter pools different in activity may influence their mobility and bioavailability in the soil. In this research, the distribution characteristics of 15 kinds of USEPA priority PAHs in soil light fractions, heavy fractions and different fractions of combined humus of soil heavy fractions were studied by the fractionation method for soil organo-mineral complexes. The results showed that the contents of total PAHs in light fractions ranged from 1.30 ± 10^4 to 1.07 ±10^5μg kg^-1, far greater than in heavy fractions, ranging from 221.7 to 297.8 μg kg^-1. Although the light fractions accounted for only 0.4 % to 2.3 % of the soil, they got associated with 31.5 % to 69.5 % of the PAHs in soils. The PAHs in heavy fractions were mainly associated with tightly combined humus, accounting for 71.2 % to 87.2 % of total PAHs in heavy fraction. The contents of PAHs in different fractions of combined humus of heavy fractions had significantly positive correlation with their organic carbon contents （p 〈 0.01 ）. The enrichment ability of tightly combined humus was significantly greater than that of stably combined and loosely combined humus. Environmental risk of PAHs polluted soils probably comes mainly from the PAHs combined with soil light fractions.
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