Proceedings of the Workshop - Georg-August-Universität Göttingen

According to Ortiz (1997), secondary forests can present better efficiency in
carbon fixation than the primary forest due to the fast grow; the carbon is rapidly fixed
in the wood because these species produce more biomass. The plantations continue
being a faster alternative for carbon fixation in comparison to native forest.
Nevertheless, in sites with various rotations of plants, an inverse effect might
occur. There is an extraction of the soil nutrients and in the long term the plantations
growth can decrease. It can also happen in degraded forests if there was no control of
the harvesting individuals; the rich genetics are being eliminated and the development
and recovery of this decreases according to the intervention degree in the forest
(Schlatter 2010).
4. Conclusions
Forest land-use showed an increase of 179440.01 ha, which is attributed by 62.9% to
exotic forest plantations, unlike the native forest sub-use decreased 4.1% in its area.
Exotic plantation area increased from sites with previous uses in agriculture (50%),
pasture (35%) and native forest (13%).
125.3ha have been degraded from second-growth forest to open second-growth
forest; extraction of wood is one of the possible causes of forest degradation. The
pressure is mainly produced for second-growth forests which in turn helped the
establishment of forestry plantations. However, it was not possible to detect degraded
forests due to the scale of work.
The native second-growth forest has stock values of 10088.6 Mt C and 2626.33 Mt
C for the dense and open structures, respectively, while the mature native forest
dominates the stock to the category of very dense 25867.28 Mt C in 2007.
The carbon stock decreased for the native forest category but increased for the
forest plantations. In total, a positive balance of 20861.1 Mt C was presented due to the
increase in reforestation plantations.
5. Recommendations
The need is shown to increase the spatial resolution of the territorial information for
detecting internal changes in the forest (degradation) for the same structure.
6. Acknowledgements
To all of the laboratory team Geomatics, University Austral of Chile, for their effort and
dedication, who participated in the draft update of the ninth region, without which it
would have been possible to make this work.
The teachers who contributed their time to resolve our doubts Jorge Gayoso and
Juan Schlatter, and the guidance of Victor Sandoval, for their dedication and
unwavering support.
7. References
Aguayo M, A Pauchard, G Azócar & O Parra. 2009. Cambio del uso del suelo en el centro sur
de Chile a fines del siglo XX. Entendiendo la dinámica espacial y temporal del paisaje.
Rev. chil. hist. nat. 3 (82): 361-374.
Armesto J, D Manuschevich, A Mora, C Smith-Ramirez, R Rozzi, A Abrazúa & P Marquet.
2010. From the Holocene to the Antropocene: A historical framework for land cover
change in southwester South America in the past 15,000 years. Land Use Policy. 27:
148-160.
Bertran J & E Morales. 2008. Potencial de biomasa forestal. CNE/GTZ. Santiago, CH. 56 pp.
Burschel H, A Hernández & M Lobos. 2003. Leña: una fuente energética renovable para Chile.
Editorial Universitaria. Santiago, CH. 171pp.
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