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Impatto di colture bioenergetiche in sistemi agro-pastorali mediterranei

Congiu, Giovanni Battista (2011) Impatto di colture bioenergetiche in sistemi agro-pastorali mediterranei. Doctoral Thesis.

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Abstract

The EU and national incentives for renewable energy generated a new demand of biofuel also in Sardinia, where permanent pastures and field crops cover about 50% and 13% respectively of the total island area. Some other biofuel crops have been introduced in the mainland, where about 20% of the cereal area has been abandoned between 2002 and 2007, because of the low productivity and the unreliable price dynamics. The introduction of biofuel crops in this context, poses a number of issues in relation to the integration in the agro-pastoral system, environmental impact and energy efficiency. The aim of this paper was to assess the energy balance and global warming potential (GWP) of the oilseed crops that are being introduced in Sardinia, rapeseed (Brassica napus var. oleifera D.C) and carinata (Brassica carinata A. Braun), by applying the Life Cycle Assessment (LCA) methodology. Field data were collected in Sardinia on almost all farms growing rapeseed (8 farms, 239 ha) and carinata (1 farm, 200 ha). The GWP of the rapeseed crop ranged from 11,9 to 38,9 gCO2 eq MJ-1 and for carinata were 19,2 gCO2 eq/MJ. The energy demand of rapeseed ranged between 5.318 and 10.201 MJ/ha, while it was 9.612 MJ/ha in carinata. The observed FER of carinata was 5.31, lower than all but two of the rapeseed fields investigated. Mineral fertilizers were recognised as the most relevant factor contributing to the environmental impact of both crops.

Item Type:Doctoral Thesis
ID Code:5125
Contributors:Roggero, Pier Paolo
Publisher:Universita' degli studi di Sassari
Uncontrolled Keywords:Life cycle assessment, bioenergy crops, Sardinia
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/02 Agronomia e coltivazioni erbacee
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze agronomiche e genetica vegetale agraria
Cicli, scuole e corsi:Ciclo 23 > Scuole > Scienze dei sistemi agrari e forestali e delle produzioni alimentari > Produttività delle piante coltivate
Deposited On:05 Apr 2011 11:37

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