Mechanized harvesting of eucalypt coppice for biomass production using high mechanization level.

摘要: Nacrtak The main aims of this study were to determine the productivity, profitability and energy balance (output/input) mechanized harvesting applied a eucalyptus plantation in central Italy. area was located Rome, at an altitude 35 m a.s.l., on flat, even site (average slope gradient 3%). stand eucalypt coppice (Eucalyptus camaldulensis Dehnh.) harvested for first time 2000. planting pattern square with 3 among stumps (1111 trees ha). By 2009, insect (Phorachantha semipunctata) attacks had reduced stump density 592 ha. work system Whole Tree System (WTS) final assortement chips energy. Machine rates calculated using coefficients mathematical formulas extracted from methodologies proposed by different authors. Energy estimated Gross Requirements (GER) method. In these plantations, seems most appropriate: is demonstrated high productivity recorded (PSH15 6.5 td.w. h –1 worker) favorable (output/input 23.8, 95.8% efficiency). However cost still (44.30 € tf.w. ) can only be through careful operational planning.