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EXISTENCE AND PRODUCTIVITY
By comparing the results of the last two National Forest Inventories carried out in Spain, one
can determine the industry's growth over approximately 25 years. The statistics reflect the following:
The number of deep root trees has tripled, at the expense of those shallow rooted.
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The volume with bark has increased some 50%. |
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Growth has improved some 62%. |
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Coniferous trees have the quickest growth with a 58% increase in front
of the broad-leafed trees with 33%. |
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These figures show the annual increment of wood yielding volume. Broad-leafed
trees increased 77%, while the coniferous only 57%. The actual existence of so many conifers is one of the
forest inventories important finds. The volume with bark of the coniferous type is 334.276.000 m3, realising
an annual increment of 16,6 million m3 in the 20-year period between inventories. |
With regard to the broad-leafed type, the total is estimated to be 165.648.000 m³, with
an annual increment in volume of 7,16 million m³.
The total volume with bark is 500 million m³ with an annual increment of 23,84 million m³.
A breakdown of species type, we have the following listing for coniferous:
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Pinus pinaster: 96,6 million m³ and an anual Dvolumen of 6,2 million m³. |
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Pinus sylvestris: 95,6 million m³ and an anual Dvolumen of 4,1 million m³. |
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Pinus nigra: 38,5 million m³ and an anual Dvolumen of 1,4 million m³. |
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Pinus radiata: 36,9 million m³ and an anual Dvolumen of 2,4 million m³. |
Broad-leafed: |
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Fagus sylvatica: 53,9 million m³ and an anual Dvolumen of 1,5 million m³. |
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Eucaliptus sp: 14,6 million m³ and an anual Dvolumen of 2,2 million m³. |
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Q.robur/Q.petraea: 13,2 million m³ and an anual Dvolumen of de 0,5 million m³. |
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Castanea sativa: 13,0 million m³ and an anual Dvolumen of 0,7 million de m³. |
The areas of high productivity within Spain are defined as follows: |
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Low lands, below the 400-m. altitude, Galicia, Cantabrian Cornisa
and Portugal, understandably with half the normal productivity between 7,5 and 9 m³/ha./year, with a
maximum surface area of 3,8 million has. |
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Highlands of Galicia, Cantabrian Cornisa and the Pyrenees, a
productivity of between 6 and 7,5 m³/ha/year, with a maximum surface area of 1,6 million has. |
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Highlands climate humid, interior mountains, productivity between 4,5
and 6 m³/ha./ year, with a maximum surface area of 2,5 million has. |
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Fertile lands and riversides, productivity 6 to 7,5 m³/ha/year,
with 0,2 million has. |
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Other areas have a variable productivity. Maximum surface area
of 0,7 million has. |
* References taken from the following sources:
La Industria de la Madera en cifras, consolidated Data from the period 1984-1994, M. A. González
Álvarez, J. Ríos Boeta, F. Peraza Sánchez, Association of Technical Investigations for the Industry, Wood and Cork - AITIM, 1997.
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