Survival rates and characteristics of spreads in two years stumps of crops with dendroenergy potential
DOI:
https://doi.org/10.29059/cienciauat.v14i1.1143Keywords:
management of coppice, woody crops, bioenergy, survivalAbstract
Several species of the genera Eucalyptus and Acacia are suitable for biomass production useful in energy generation. The objective of this research was to evaluate the survival and chaof four dendroenergetic species in three population densities. A randomized block design with three replications was used in three sites (Collipulli, La Aguada and Pilpilco Abajo plots) with contrasting edaphoclimatic characteristics. Eucalyptus globulus, Eucalyptus denticulata, Eucalyptus nitens and Acacia dealbata were studied in three plantation densities (5 000 trees/ha, 10 000 trees/ha and 15 000 trees/ha). The survival percentage and characteristics of stump regrowth characteristics of each stump were evaluated. The variables specie, plantation density and planting site affected the analyzed parameters. Plantation density affected the diameter and height of prevalent sprouts of proventic proventitious shoots in all species. Hihest stump survival rate (97 %) was presented by Eucalyptus nitens in Pipilco Abajo, with 79 % shoots survival of sprouts at a density of 5 000 trees/ha. However, at densities of 15 000 trees/ha, regrowth survival was 29%. The Acacia dealbata is a species characterized by its colonization capacity. However, at La Aguada, which had population densities of 5 000 trees/ha and 10 000 trees/ha, it showed a low stump (19% and 18 % respectively) and shoots (57 % and 63 % respectively) survival rate. The species Eucalyptus globulus showed high stump and shoot survival rates in all sites evaluated, therefore it can be considered a good option to optimize the scrub system.
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