Impact of wildfires on soil properties in the «Leopard’s Land» National Park (Primorsky Kray)

We investigated soils of southern Primorye, which are affected by wildfires of different frequency. Comparing post-fire soils with background ones we found out specific features of their morphological, physical, chemical and physico-chemical properties. Due to fire-induced changes of plant communities (from forest to meadow) the organic matter content has increased from 5% to 7% and the humus horizon thickness from 8 to 14 cm. The organic matter stocks in 0-20 cm layer of post-fire soils are 3-4 times higher than in the background ones. After wildfires the pattern of magnetic susceptibility changes along the soil profile with the increase in subsurface layers. The pH values are 1-2 points higher in subsurface horizons of all investigated post-fire soils. As a result the upper layers become the least acid along the whole soil profile. Pyrogenic horizons contain less oxalate-soluble iron than the underlying ones. The postfire soils have higher PAHs concentrations but the composition of PAH changes just slightly. Light polyarene structures are prevalent in all investigated soils with predominance of the phenanthren-diphenil-naftaline association which proves the natural rather than technogenic origin of PAHs.

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