Forest management/Description: Difference between revisions
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|Reference=Kallio et al., 2004; Arets et al., 2010; FAO, 2001; FAO, 2009; FAO, 2010; Brown 1990; Carle and Holmgren 2008 | |Reference=Kallio et al., 2004; Arets et al., 2010; FAO, 2001; FAO, 2009; FAO, 2010; Brown 1990; Carle and Holmgren 2008 | ||
|Description=Forest harvest in IMAGE is driven by the timber demand per region. This demand is the sum of the domestic demand and the net import of timber. Trade is accounted for by either external models, such as EFI-GTM ([[Kallio et al., 2004]]). Logging in a region continues until the timber demand is met. A stepwise procedure is designed to attribute shares of the total demand to the different management systems. Part of the demand for timber is fulfilled by the harvest of wood from the conversion of forests to agriculture. Next, all full-grown wood plantations (at the end of their rotation cycle) of a region are harvested. Plantations are used first, as these have been established on purpose and significant investments have been made. When this harvested amount is not enough to supply the demand, other management systems are used. This can be either done by applying clear-cut cycles in semi-natural forests or by selective logging of heterogeneous forests. The share of each system is derived from inventories in different world region. | |Description=Forest harvest in IMAGE is driven by the timber demand per region. This demand is the sum of the domestic demand and the net import of timber. Trade is accounted for by either external models, such as EFI-GTM ([[Kallio et al., 2004]]). Logging in a region continues until the timber demand is met. A stepwise procedure is designed to attribute shares of the total demand to the different management systems. Part of the demand for timber is fulfilled by the harvest of wood from the conversion of forests to agriculture. Next, all full-grown wood plantations (at the end of their rotation cycle) of a region are harvested. Plantations are used first, as these have been established on purpose and significant investments have been made. When this harvested amount is not enough to supply the demand, other management systems are used. This can be either done by applying clear-cut cycles in semi-natural forests or by selective logging of heterogeneous forests. The share of each system is derived from inventories in different world region. | ||
[[File:ForestManagementModel.png| | [[File:ForestManagementModel.png|thumb|right|240px|alt=Component flow chart forest management|Flow diagram of forest management]] | ||
<h3>Rotation cycle logging</h3> | <h3>Rotation cycle logging</h3> | ||
Per year, region and vegetation type is defined what fraction of the forests is logged by selective cut and what part is logged by clear cut (parameters from inventory by [[Arets et al., 2010]]). Selective cut only takes place on vegetation types with a high forest coverage (>75%). After logging only a fraction of the harvested wood is actually removed as timber for the market. What is left behind in the forest represents the losses during tree harvesting, either from unintended collateral tree damage or by removing unusable tree parts. Harvest in any forest management type can only take place when the rotation cycle of regrowth of a forest is completed (see table). | Per year, region and vegetation type is defined what fraction of the forests is logged by selective cut and what part is logged by clear cut (parameters from inventory by [[Arets et al., 2010]]). Selective cut only takes place on vegetation types with a high forest coverage (>75%). After logging only a fraction of the harvested wood is actually removed as timber for the market. What is left behind in the forest represents the losses during tree harvesting, either from unintended collateral tree damage or by removing unusable tree parts. Harvest in any forest management type can only take place when the rotation cycle of regrowth of a forest is completed (see table). | ||