EFI : European Forest Institute
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Le réseau pour la gestion durable des forêts cultivées.

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FORSEE : Indicateur évalué

Indicator 3.7 : Harvestability
Total forest area in Sousa Valley (1995): 34668 ha

Forest area mapped (1995): 4956,1 ha

Percentage of the total forest covered: 14,3 %

Cost

TOTAL COST: 2433 €

Cost/ha: 0,49 €

The total cost includes :

1- Data collection

2388 €

2- Data analysis : 45 €

Results

Forest harvestability in half of the municipality of Paredes in 1995

img1

Percentage of forest area where timber can be harvested without the need of building new forest roads

table1

Source: Values given by ArcGIS 9

Remarks

The spatial analyse of this indicator was done after the reclassification of the road map done for the indicator accessibility.

The type of accessibility was classified as the following types:

Not accessible: Forest land at a distance of more than 2000 m of a permanent road

Accessible 1: Forest land at a distance lesser than 200 m of a permanent road

Accessible 2: Forest land at a distance between 200 and 1000 m of a main road and with a slope below 60 %

Accessible 3: Forest land between 1000 and 2000 m of a main road and with a slope below 35 %.

According to the map and the associated table, in the forest area covered by this indicator, only 5 % of the forest area (in 1995) is classified as not accessible and then not harvestable. All the remaining forest is accessible being about 44% of the forest area at a distance between 200 and 1000 m of a main road and with a slope below 60 %.

Shortcomings and improvements

As the evaluation of this indicator depends on the evaluation of the indicator 3.6 the shortcomings and improvements to be done are the same.

One suggests the indicator accessibility and the indicator harvestability to be evaluated as just one indicator because the evaluation of the last one depends on the evaluation of the first.

Comments and conclusion

With updated road maps and with the evaluation of the indicator 3.6 well done, the spatial analyse of the indicator 3.7 and the calculation of the percentage of forest land where timber can be harvested without the need of constructing new forest roads this indicator is of easy evaluation and feasible in Sousa Valley.

In terms of Forest Sustainable Management one can conclude that in 1995, in half of the municipality of Paredes, almost all the forest was accessible for harvesting.

Indicator not considered by Criterion 3 of the Portuguese Norm 4406 2003.

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