樟树林地土壤多环芳烃的含量及其分布特征

Study on Concentration and Distribution Characteristics of Polycyclic Aromatic Hydrocarbons(PAHs)in Soils of Cinnamomum camphora Stand

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。

Concentration and distribution characteristics of PAHs in soil between a Cinnamomum camphora stand and a bare land were studied, and PAHs concentration levels in two kinds of soil were evaluated. The results showed PAHs mainy accumulated in 0 - 30 cm soil depth in two lands and apparently decreased with the increasing of soil depth. Every soil layer was dominated by high molecular weight PAHs, So PAHs mainly result from combustion. The PAHs concentration is 1.1 times as much in the C. camphora forest land as in the bare land, In addition, the evaluation also implied PAHs concentrations in the bare land were higher than those in the C. camphora forest land. PAHs in the C, camphora forest land and the bare land exceed standard by 5 kinds and 8 kinds, respectively.