Determination of Total Polysaccharides in Soils Affected by Forest Fires
2012
Atanasova, E., Institute of Soil Science ' N. Pushkarov', Sofia (Bulgaria) | Atanassova, I., Institute of Soil Science ' N. Pushkarov', Sofia (Bulgaria) | Teoharov, M., Institute of Soil Science ' N. Pushkarov', Sofia (Bulgaria)
Cinnamonic forest soils (Luvisols) on the ridge and the hillside of Lyulin Mountain subject to a fire in the late summer of 2007, a bogged soil at the footslope and a control (unburnt) soil on the opposite site of the hill were studied. For the first time a modified procedure (Lowe, 1993) for spectrophotometric determination of polysaccharides in Bulgarian soils was developed. Total sugars of 2 mm and 250 μm soil fractions were analysed through extraction with c. H2SO4 with subsequent spectrophotometric determination.We found predominant accumulation of total polysaccharides in the finer fraction ( 250 μ) of the burnt soils on the ridge, the upper and the middle parts of the hill compared with the control soil. For the coarser ( 2 mm) soil fractions the opposite trend was observed, i.e. lower contents were found in the burnt soils than in the control soil. The results show that the finer soil fraction is more indicative for the changes in the polysaccharides as part of soil organic matter (both unhumified and humified) occurring in the soils after fire.
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