EVALUATION OF BIOMASS PRODUCTION POTENTIAL OF POPLARS AND WILLOWS ON SITE RECULTIVATED AFTER BROWN-COAL MINING

摘要

The 15 year long experiment was established in experimental plantation with assortment of selectedpoplar species (Populus nigra, P. deltoides) and their natural hybrids (P. × canadensis, P. nigra × P. simonii) inlocality Locho?ice on spoiler heap of Chaba?ovice surface mine (50°38‘1,244‘‘N, 13°56’59,754‘‘E) in the north–western part of Czech Republic. Following parameters were measured on trees in the end of vegetation period:survival rate, tree height, stem diameter and number of stems. The results show that different clones of poplar speciesand their hybrids have got different yield potentials in local conditions. Average biomass yields were higher in 3-yearrotation if compared with 12-year rotation – 5,5 resp. 3,6 t(dry)/ha/year – of clones with best survival rate. Poplarhybrids of P. nigra × P. simonii had the best average yields 3,7–7,1 t(dry)/ha/year in 3-year rotation after 15 years (5harvests).