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研究樟树林地和无林地土壤中PAHs的含量和分布特征,并对两种土地类型土壤中的PAHs含量水平进行评价。结果表明:两种土地类型土壤中PAHs主要积累在0～30cm的表土层,并随土层加深而明显减少,各土层中以高环的PAHs组分为主,PAHs主要源于燃烧源;樟树林地土壤中PAHs含量明显低于无林地,无林地表土层中PAHs含量是樟树林地表土层的1.1倍;对两种土壤中的PAHs含量水平进行评价,得知樟树林地土壤PAHs超标5种,无林地土壤不仅超标8种,且超标倍数明显大于樟树林地,樟树林地土壤的PAHs污染程度小于无林地。
The content and distribution characteristics of PAHs in the soil of camphor woodland and non-forestland were investigated, and the content of PAHs in soil of the two land types was evaluated. The results showed that PAHs in two types of soils mainly accumulated in the topsoil of 0-30 cm depth and obviously decreased with the deepening of soil depth. PAHs in the soil layers were dominated by high PAHs and PAHs mainly originated from combustion sources. The content of PAHs in the soil of camphor woodland was significantly lower than that of the non-forestland. The contents of PAHs in the forestless surface soil were 1.1 times that of the soil of camphorwood forest. The content of PAHs in the two soils was evaluated. In the non-woodland soils, not only 8 kinds of soil were exceeded, but the exceeded standard times were obviously higher than that of camphor tree land. The soil PAHs pollution of camphor woodland was less than that of non-forest land.