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Forest Fertilization with Wood Ash

Effect on the Distribution and Storage of Polycyclic Aromatic Hydrocarbons (PAHs) and Polychlorinated Biphenyls (PCBs)

^a Swiss Federal Institute for Forest, Snow, and Landscape Research (WSL), Zürcherstr. 111, CH-8903 Birmensdorf, Switzerland
^b Institute of Soil Science and Soil Geography, University of Bayreuth, 95440 Bayreuth, Germany

View larger version (35K): [in a new window]   Fig. 1. Location and layout of the experimental site.

View larger version (18K): [in a new window]   Fig. 2. Photo of one of the sampled soil profiles. Preferential flow paths are black, soil matrix white.

View larger version (30K): [in a new window]   Fig. 3. Polycyclic aromatic hydrocarbon (PAH) spectra of the Oa horizon from the control plots, of the wood ash, and of the Oa horizon 1 yr after the wood ash application.

View larger version (17K): [in a new window]   Fig. 4. Correlation between the input rates of individual polycyclic aromatic hydrocarbons (PAHs) with the wood ash and the increase in storage (storage) in the organic layer without the outlier plot (see text).

View larger version (31K): [in a new window]   Fig. 5. Polchlorinated biphenyl (PCB) spectra of the Oe horizon from the control plots, of the wood ash, and of the Oe horizon 1 yr after the wood ash application.

View larger version (22K): [in a new window]   Fig. 6. Relationship between the octanol–water partition coefficient (log Kow) value of the compounds (Mackay et al., 1992; Hawker and Connell, 1988) and the concentration ratio between the individual polycyclic aromatic hydrocarbons (PAHs; top) and polychlorinated biphenyls (PCBs; bottom) in the preferential flow paths and in the matrix of the A horizon (0 to 9 cm).