ENERGY POTENTIAL OF VARIOUS STAND TYPES OF EUROPEAN CHESTNUT (CASTANEA-SATIVA MILL) IN SLOVAKIA

The work evaluates energy values of dry matter (kJ.g(-1)) and abovegro und biomass (GJ.ha(-1)) and its components determined by a water calor imeter of KL-5 type in various stand types of European chestnut (Casta nea sativa Mill.) at the age of 28 years on a series of PRA-s at Lefan tovce. Highest energy values were found in fruits of European chestnut (29.55 kJ.g(-1)) and smallest in its bark (17.08 kJ.g(-1)). The highe st total heat energy was recorded in pure stands of European chestnut (2514.84 GJ.ha(-1)), the highest proportion of which falls to stem (83 .65%) and the smallest to fruits (1.08%). Of the mixed stands higher t hermal energy was recorded in mixed stands of European chestnut and li ttle-leaf linden (2352.08 GJ.ha(-1)) in comparison with mixed stands o f European chestnut and Scotch pine (2308.54 GJ.ha(-1)).