Abstract
In the last decade, the emergence of leaf disease caused by the fungus Mycosphaerella sp. is jeopardizing the development of some species of the genus Eucalyptus at its juvenile life stage. The development of forest species for energy purposes, namely to generate biomass in shorter periods, must take into account this circumstance at the time of measuring the energy density generated by these species. This paper defines a method which relates the measure of the severity of the disease with the energy lost per Ha. First, it has been characterized from the energy point of view, thus, it has quantified the calorific value of the biomass of Eucalyptus globulus decomposing it in their respective fractions at certain moisture. Then, depending on the degree of severity of the disease, it has been estimated the amount of dry biomass per tree at the age of 27 months and crossing it with the calorific values it has been determined the energy loss per unit of area according to the overall damage index. Finally, a brief economic analysis considering the consequences of this disease in a stand of Eucalyptus globulus for energy production, has been performed.
Highlights
The energy of the biomass plays an important role as one of the power sources of the future
The objective of this work is to determine how the energy density varies in a plantation of Eucalyptus Globulus depending on the severity of the disease
The large concentration of volatile elements and aromatic substances has a decisive influence. These exist in the different parts of the tree, but especially in the leaves, with calorific values over 40,000 kJ / kg [8]
Summary
The energy of the biomass plays an important role as one of the power sources of the future. This is due to two characteristics: (1) neutrality in the emissions of CO2, and (2) relative abundance and uniformity to a worldwide level. Vegetal species of fast growth are one of the suitable ways to take advantage of the potencial power of the biomass. This allows us to avoid the operation of native forest of high ecological value. These species are commonly called energy crops and they must meet mainly two premises: (1) to adapt to the territory in that they are cultivated, and (2) to have a good energy efficiency
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