Effects of silvicultural treatments in the tropical rain forest : a comparison between ZF-2 (Manaus, Brazil) and Paracou (French Guiana)
The dynamics of two Amazonian forest stands with and without silviculturaI treatments are compared on a 10-year basis. The experimental sites at Paracou (French Guiana) and ZF2 (Manaus, Brazil) are located oil different Substrate but with similar floristic composition. The natural stand at ZF2 is more dynamic (hail at Paracou, this difference could be due to site conditions but also to a short-term non-equilibrium in the observed dynamics. The stand response during Ill(? first three years after logging is characterized by a decrease In stem density, and basal area because of high mortality rates. The stand basal area recovered slowly at a comparable rate between sites of about 2%/year; this rate is linked to the intensity of canopy opening. The floristic composition is modified with an increase of light-demanding species. Although the residual stand does not resemble a secondary, stand it represents an useful reference vis-à-vis dynamics of logged and secondary forests. This study, leads to some proposals for defining silvicultural *treatments adapted to this type of ecosystem.
| Main Authors: | , , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
CATIE
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| Subjects: | K10 - Production forestière, régime sylvicole, production forestière, http://aims.fao.org/aos/agrovoc/c_7070, http://aims.fao.org/aos/agrovoc/c_3061, http://aims.fao.org/aos/agrovoc/c_3093, http://aims.fao.org/aos/agrovoc/c_1070, http://aims.fao.org/aos/agrovoc/c_3081, |
| Online Access: | http://agritrop.cirad.fr/264615/ |
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| Summary: | The dynamics of two Amazonian forest stands with and without silviculturaI treatments are compared on a 10-year basis. The experimental sites at Paracou (French Guiana) and ZF2 (Manaus, Brazil) are located oil different Substrate but with similar floristic composition. The natural stand at ZF2 is more dynamic (hail at Paracou, this difference could be due to site conditions but also to a short-term non-equilibrium in the observed dynamics. The stand response during Ill(? first three years after logging is characterized by a decrease In stem density, and basal area because of high mortality rates. The stand basal area recovered slowly at a comparable rate between sites of about 2%/year; this rate is linked to the intensity of canopy opening. The floristic composition is modified with an increase of light-demanding species. Although the residual stand does not resemble a secondary, stand it represents an useful reference vis-à-vis dynamics of logged and secondary forests. This study, leads to some proposals for defining silvicultural *treatments adapted to this type of ecosystem. |
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