Forest management/Data uncertainties limitations: Difference between revisions

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===Limitations===
===Limitations===
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Timber demand in IMAGE 3.0 is the sum of the demand for sawlogs, pulpwood and fuelwood. This total demand is than used in harvesting forests across the world, without knowing anymore the underlying wood types. So, forest plantations, for example, can used to fulfill the demand for either sawlogs of fuelwood. For specific assessments (e.g. for timber use for modern biomass), it would have been useful to remain the three wood types in the allocation.  
Timber demand in IMAGE 3.0 is the total demand of sawlogs, pulpwood (both based on [[FAO]] for the historic period), and fuelwood (based on [[IEA]] and calculated by the [[TIMER model]]). The demand is fulfilled by harvesting wood from any type of forest without specifying the original source of demand. This can be relevant as different types of wood are used for timber, pulp and fuel. For fuelwood we assume that a certain fraction originate from informal sources, like gathering. For specific assessments it would be useful to include this detail in the allocation of forestry.


The timber demand in a region is the sum of local/regional demands and timber claims by other regions. The trade assumptions are adopted from external models, limiting the application of the model for cases with regional timber scarcity (which will change the total demand in a region).
The timber demand in a region is the sum of local/regional demands and timber claims by other regions. The trade assumptions are adopted from external models, limiting the application of the model for cases with regional timber scarcity.
 
The only driver of deforestation modelled in IMAGE 3.0 is the net expansion of
agriculture per region. Many drivers of deforestation are not related to agricultural
expansion, but there is no global assessment of these other drivers. Therefore, total
deforestation rates in IMAGE are calibrated to FAO deforestation rates. Drivers and extent of deforestation are very uncertain and subject to debate, yet determine future deforestation and deforestation emissions in scenario simulations.
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Revision as of 14:46, 10 July 2017

Link to framework components overview

Parts of Forest management/Data uncertainties limitations

  1. Introduction page
  2. Model description
  3. Policy issues
  4. Data, uncertainty and limitations
  5. Overview of references
Component is implemented in:
Components:
Related IMAGE components
Projects/Applications
Key publications
References
Forest management module in IMAGE 3.0
Flowchart Forest management. See also the Input/Output Table on the introduction page. The option of forest plantations in IMAGE and LPJmL is still under development, and expected to be available soon.
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