Abstract

The accumulation of polycyclic aromatic hydrocarbons (PAHs) in plants and peat of three natural subzones—forest-tundra, southern tundra, and northern tundra—is discussed. The content of polyarenes is estimated with high performance liquid chromatography. The absence of statistically significant differences in the PAH accumulation by the plants of the same species in the studied ecotones allows for extrapolation of the data on PAH composition of the studied plants to other background hummocky bogs. The PAH composition of dominant plants influences the PAH composition of the upper peat layers, as is demonstrated by high correlation coefficients. A gradual decomposition of the herbs and trees residues, enriched with lignin, leads to neoformation of heavy polyarene structures (absent in plants) in peat. The coefficients of correlation between peat and plant PAH compositions decrease with depth and the degree of peat decomposition. All studied peatlands display an inverse correlation between the accumulation of naphthalene and benzo[ghi]perylene and the decrease in PAH content in the upper layers of permafrost. The content of polyarenes in the permafrost horizons is determined by the specific historical features in peatland formation. The peak values of five–six ring PAH structures, mainly benzo[ghi]perylene, are observed in the peat layers formed during the Holocene climatic optimum under excessive moistening. As for the raised and transitional bogs having originated during the Subboreal, any increased benzo[ghi]perylene concentrations are unobservable. A decrease in the soil temperatures from south to north is a likely reason for the observed decrease in the PAH content in peatlands from the forest-tundra and southern tundra to northern tundra.

中文翻译：

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森林-苔原-北部苔原带层序丘陵沼泽多环芳烃组成的形成

摘要

讨论了森林苔原、南部苔原和北部苔原三个自然分区的植物和泥炭中多环芳烃 (PAHs) 的积累。用高效液相色谱法估计聚芳烃的含量。在所研究的交错带中，相同物种的植物的 PAH 积累没有统计学上的显着差异，因此可以将所研究植物的 PAH 组成数据外推到其他背景的丘状沼泽。优势植物的 PAH 组成会影响上层泥炭层的 PAH 组成，这可以通过高相关系数来证明。富含木质素的草药和树木残留物的逐渐分解导致泥炭中重聚芳烃结构（植物中不存在）的新形成。泥炭和植物 PAH 成分之间的相关系数随着深度和泥炭分解程度的增加而降低。所有研究过的泥炭地都显示出萘和苯并[ghi ]苝和多年冻土上层多环芳烃含量的降低。多年冻土层中聚芳烃的含量取决于泥炭地形成的特定历史特征。五六环多环芳烃结构的峰值，主要是苯并[ ghi ]苝，在过度湿润下全新世气候最佳期间形成的泥炭层中观察到。至于起源于次寒带期的隆起和过渡沼泽，任何增加的苯并[ ghi ]苝浓度都是无法观察到的。土壤温度从南到北的降低可能是观察到从森林苔原和南部苔原到北部苔原的泥炭地中 PAH 含量下降的可能原因。