title: The influence of tree species composition on the storage and mobility of semivolatile organic compounds in forest soils.
abstract: Soil contamination with PCBs and PAHs in adjacent forest plots, characterized by a distinct composition in tree species (spruce only, mixed and beech only), was analyzed to investigate the influence of ecosystem type on contaminant mobility in soil under very similar climate and exposure conditions. Physical-chemical properties and contaminant concentrations in litter (L), organic (F, H) and mineral (A, B) soil horizons were analyzed. Contaminant distribution in the soil core varied both in relation to forest type and contaminant group/properties. Contaminant mobility in soil was assessed by examining the ratios of total organic carbon (TOC)-standardized concentrations across soil horizons (Enrichment factors, EFTOC) and the relationship between EFTOC and the octanol-water equilibrium partitioning coefficient (KOW). Contaminant distribution appeared to be highly unsteady, with pedogenic/biogeochemical drivers controlling contaminant mobility in organic layers and leaching controlling accumulation in mineral layers. Lighter PCBs displayed higher mobility in all forest types primarily controlled by leaching and, to a minor extent, diffusion. Pedogenic processes controlling the formation of soil horizons were found to be crucial drivers of PAHs and heavier PCBs distribution. All contaminants appeared to be more mobile in the soil of the broadleaved plot, followed by mixed canopy and spruce forest. Increasing proportion of deciduous broadleaf species in the forest can thus lead to faster degradation or the faster leaching of PAHs and PCBs. The composition of humic substances was found to be a better descriptor of contaminant concentration than TOC.
authors.affiliation: RECETOX (Research Centre for Toxic Compounds in the Environment), Kamenice 753/5, CZ-625 00 Brno, Czech Republic. Electronic address: komprdova@recetox.muni.cz.
authors.forename: Klára
authors.initials: K
authors.lastname: Komprdová
authors.affiliation: RECETOX (Research Centre for Toxic Compounds in the Environment), Kamenice 753/5, CZ-625 00 Brno, Czech Republic.
authors.forename: Jiří
authors.initials: J
authors.lastname: Komprda
authors.affiliation: Mendel University in Brno, Faculty of Forestry and Wood Technology, Zemědělská 3, Brno 613 00, Czech Republic.
authors.forename: Ladislav
authors.initials: L
authors.lastname: Menšík
authors.affiliation: RECETOX (Research Centre for Toxic Compounds in the Environment), Kamenice 753/5, CZ-625 00 Brno, Czech Republic.
authors.forename: Lenka
authors.initials: L
authors.lastname: Vaňková
authors.affiliation: Mendel University in Brno, Faculty of Forestry and Wood Technology, Zemědělská 3, Brno 613 00, Czech Republic.
authors.forename: Jiří
authors.initials: J
authors.lastname: Kulhavý
authors.affiliation: RECETOX (Research Centre for Toxic Compounds in the Environment), Kamenice 753/5, CZ-625 00 Brno, Czech Republic; Norwegian Institute for Water Research, Gaustadalleen 21, NO-0349 Oslo, Norway.
authors.forename: Luca
authors.initials: L
authors.lastname: Nizzetto
mesh_terms: D004784:Environmental Monitoring; D065928:Forests; D011078:Polychlorinated Biphenyls / Q000032:analysis / Q000378:metabolism; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D014197:Trees / Q000145:classification / Q000378:metabolism; D055549:Volatile Organic Compounds / Q000032:analysis / Q000378:metabolism*
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D055549:Volatile Organic Compounds; D011078:Polychlorinated Biphenyls
keywords: Enrichment factors; Forest horizon; Global change; Humic substances; Mobilization; PAHs; PCBs; Soil profile; Tree composition