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Descripción
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| Productivity (m3/effective machine hour) in mechanized extraction of firewood, logs, stems or whole trees from traditional coppice forests (Quercus species, beech and chestnut) has been analyzed using data from 128 studies performed between 1973 and 2015 in Italy (99), Spain (24) and the U.K. (5). Significant differences among clearcut and selective felling productivity has not been found. Neither harvesting systems (CTL, WTS, Full Stem) have shown to mark significant differences regarding productivity, possibly because of the wide variety of extraction means and extracted products. However, a common productivity model was fitted for skidding, forwarding and yarding (considered in a wide sense, by very different machine types), by using a nonlinear regression with explanative variables maximum extraction distance (m), machine payload (m3) and felling intensity (m3/ha). The regression equation had an adjusted R2 = 65% and an average absolute value for residuals of 1,2 m3/h. Besides, particularized productivity equations were fitted for skidding and yarding, with lower average absolute value for residuals. Finally, productivity and its relationship with the explanative variables have been compared between studies from the last decade and former ones. A significant increment of productivity for the same values of these factors has been found, probably due to the technological improvements of the mechanized extraction means used in recent times | |
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Internacional
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Si |
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Nombre congreso
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125th IUFRO Anniversary Congress |
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Tipo de participación
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960 |
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Lugar del congreso
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Freiburg (Alemania) |
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Revisores
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Si |
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ISBN o ISSN
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978-3-902762-88-7 |
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DOI
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Fecha inicio congreso
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18/09/2017 |
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Fecha fin congreso
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22/09/2017 |
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Desde la página
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612 |
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Hasta la página
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612 |
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Título de las actas
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125th IUFRO Anniversary Congress - Book of Abstracts, 2017 |