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Characterisation Method Information
Characterisation Method Name:
Forest land use impact on NEX
Version:
1999
Date Completed:
1999
Principal Method Name:
EPS: empirical method
Method Description:
NEX is Normalised EXtinction of species.


Model
The characterisation factor is determined by the empirical method.
Category indicator value in system considered
According to forestry in Finland and in Sweden is responsible for the threat to 38 and 21% of the NEX respectively. Assuming that the contribution to the threat is the same as the contribution to extinction, this gives a category indicator value of 0.38 and 0.21 NEX in Finland and Sweden respectively. For the global forestry it is assumed that the Swedish figure is the most representative and a best estimate of 0.2
NEX is used.

Contribution to category indicators value from a flow unit

The global use of forestland is about 4E+13 m 2 year per year. The contribution from the
use of 1 m 2 is therefore 2.5E-14 /m 2 year.
Another way to quantify forestry is via the harvesting of timber. The global harvesting of timber was 3521 million m 3 solid volume of roundwood without bark during 1990 (UN,
1994). Then the contribution is 2.84E-10 / m 3 .

Calculation of characterisation factor

The characterisation factor is thus 0.2 NEX*2.5E-14 /m 2 year = 5.0E-15 NEX/m 2 year or 0.2 NEX*2.84E-10 = 5.68E-11 NEX/m 3 .
Literature Reference:
Steen B (1999b): A systematic approach to environmental priority strategies in product development (EPS). Version 2000 Models and data of the default method CPM report Chalmers University of Technology Sweden
Methodological Range:
The system is global, but limited to arable land. The time frame is 1990.
Notes:

Existing Characterisation Factors of Forest land use impact on NEX
Characterisation Parameter Category Indicator Impact Indication Principle Aspect Substance Quantity Unit Notes
CFactor NEX EPS/2000
Type = Natural resource
Direction = Input
Media = *
Geography = *
Forestry EPS/2000 5E-15 NEX/m2 year