L’impiego delle coltivazioni arboree a rapida crescita per produrre energia verde: metodi colturali , raccolta e impieghi
Author(s)
Kellezi, Mirvjena
Date Issued
February 26, 2009
Type
Doctoral Thesis
Abstract
Bio-energy and biomass system is a new scientific field, very interesting, where you can
find new available information, but there is also place for other novelty.
A lot of projects and experiences regarding to this, leads to the credence that forest
biomass assume a fundamental role, inasmuch they constitute a renewable resource,
already or easily present, in the environment.
This has been the principal reason that has permitted to undertake this study .Fast
growth species cultivated with brief rotations or short rotation forestry, abandoned areas
ripped off agriculture and marginal terrains, that can be fated to this new cultivation
typology has been the objects of the study. This includes specific cultivating methods
for biomass generation, characterized by short turns (2-5 years), high density plantation
and elevated productivity, combined this to a high level of mechanization for the
implantation and harvesting.
Height and diameter growth analyses of the plants revealed a good growth continuation,
even in abandoned drought terrains like in Summer 2007.
It can be underlined the first year growth for Ailantus altissima of 28,8 cm in height and
0,50 cm in diameter. For the Paulownia tomentosa has been verified values of 49,5 cm
in height and 0,92 cm in diameter, and for Robinia pseudoacacia 0,59 cm in diameter
and 84,6 cm in height for the plants situated in Azienda Agraria della Tuscia where the
terrain conditions were better then in Monte Romano whrere the verified growth values
has been 0,51 cm for the diameter and 54 cm for the height.
Other dendrometic and xyloenergetic analyses has been developed in a company that
cultivates poplar (Monviso clone) and locust-tree always in brief rotation turns. Dates
about density , basic density, bark and humidity percentage, chipped material, calorific
power etch. has been determined.
The locust-tree density has resulted to be 750 kg/m3 and it diminishes passing from the
base of the plant to the top; the same happens to the basic density.
The density results to be 882 kg/m3 for the poplar planted in single rows, and 767 kg/m3
for the poplar planted in double ones. This value like the value of basic density,
differently from locust-tree, increases passing from the base to the top of the plant.
The calorific power for both species is higher in the wood then in the bark.
Additional information
Dottorato di ricerca in Scienze e tecnologie per la gestione forestale e ambientale
Subjects
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