Sustainability of Short Rotation Forest Crops for Bioenergy At Three Contrasting Soil-Site Conditions.

The effects in soil carbon and nutrient availability of short rotation forest crops species (Acacia melanoxylon, Eucalyptus camaldulensis, E. globulus and Eucalyptus nitens) at high stockings (5000, 7500, 10000 trees ha^-1) were evaluated during 48 months at two contrasting sites of textural and parent material origin (granitic vs. , volcanic sand). Both sites showed no negative effects of these fast growing species on soil carbon. However, granitic sites showed a reduced nitrogen for all evaluated species and sandy soils showed slight increases in nitrogen availability. Nutritional effects were also observed in reduced foliage concentrations over time at the granitic site.