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EXCHANGEABLE PROPERTIES OF FOREST SOILS UNDER BEECH ECOSYSTEMS IN CENTRAL BALKAN AND OSOGOVO

2013; Agricultural Academy of Bulgaria; Volume: 19; Issue: 5 Linguagem: Inglês

1310-0351

Emiliya Velizarova, Ivaylo Velichkov, V. Doichinova, Irena Atanassova,

Heavy Metals in Plants

T 8.2 ) in the surface horizons of soil samples from the Balkan mountain vary with - in a wide range of 10.6 cmol.kg -1 to 20.9 cmol.kg -1 . For the soil from the osogovo Mountain, the total cationexchange capacity was higher ranging from 18.4 cmol.kg -1 - 34.4 cmol.kg -1 . t he concentrations of negatively charged strongly acid exchangeable sites ( T CA ) were from 6.0 to 15.5 cmol.kg -1 , for the soil from the Balkan mountain, while for the osogovo Mountain - they were about two times higher - from 12.0 cmol.kg -1 to 27.1 cmol.kg -1 . a similar trend for the exchangeable aluminium ( Al e ) values for the surface horizons of the Balkan mountain soil (from 1.0 cmol.kg -1 to 2.5 cmol.kg -1 ) and of the osogovo Mountain, soil (from 1.6 cmol.kg -1 , to 5.9 cmol.kg -1 ) was established. t he slight increase in the content of Al e in the soil from osogovo Mountain suggests a stronger destruction of a l-bearing minerals, most probably due to isomorphic substitutions. it was found that pod - zolization was occurring more pronouncedly in the soils of the Balkan mountain. t he base saturation (BS) in the studied soils varies from 33.0 to 75.0% of the total cation exchange capacity. For all studied sampling sites, the negative charges of soil col - loids which behave as strong acids ( T CA ) exceed the BS values, due to the additional proportion of H + and Al 3+ acidic cations.