Dinâmica do crescimento de espécies comerciais remanescentes, em áreas exploradas experimentalmente, em diferentes Intensidades de corte na Amazônia Central
Studying forest dynamics is extremely important to conduct forest management strategies, particularly in relation the cutting cycle. However, the cutting cycle is based on the total growth of the population and does not distinguish between species. The main species consumed by national and internat...
| Autor principal: | Amaral, Márcio Rogério Mota |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/5180 http://lattes.cnpq.br/1453411163509401 |
| Resumo: |
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Studying forest dynamics is extremely important to conduct forest management strategies, particularly in relation the cutting cycle. However, the cutting cycle is based on the total growth of the population and does not distinguish between species. The main species consumed by national and international markets are concentrated in a relatively small number. Due to the intense exploitation of commercial timber species, these, are at increased risk of disappearing. Thus, this work aimed to study the dynamic of forest after loging experimentally, under different cutting intensities after 25 years in the Central Amazon area and, with this information to make an estimate for the next cutting cycle. The results showed to treatments analyzed T1, T2 and T3 the estimation of stocks of the basal área and volume, for commercial species were respectively: 5,97 ± 0,16 m2.ha-1, 6,07 ± 0,23 m2.ha-1 and 4,68 ± 0,13 m2.ha-1 and 88,75 ± 2,32 m3.ha-1, 90,46 ± 3,38 m3.ha-1 e 69,79 ± 1,92 m3.ha-1 (CI 95%). The average diameter increment of commercial species was: 0,26 ± 0,03 cm.yr-1, 0,27 ± 0,03 cm.yr-1 and 0,32 ± 0.04 cm.yr-1 (IC 95%), respectively to T1, T2 e T3. Recruitment rates were higher than the rates of mortality in all treatments, ranging from 1,63 ± 0,52% a 1,98 ± 0,62% to recruitment e 1,0 ± 0,45% a 1,31 ± 0,23% to mortality (CI 95%). It was also observed that there is no correlation with rainfall, both for mortality and for the recruitment. The estimate for the second cutting cycle, depending on the volumetric increment, considering only the commercial species were: a) in accordance with Resolution No. 406 of CONAMA 2009, which establishes the increment 0,86 m3.ha-1yr-1 years for the treatment low intensity (T1), 57 years for the treatment of moderate intensity (T2) and, 78 years for the treatment of heavy intensity (T3); b) Based on the volume removed from each treatment the cutting cycle was on average 60.6 years, 75 years and 252 years respectively for T1, T2 and T3 and; c) based on current volume stock, the cutting cycle was on average 68 years for T1, 40years for T2 and 164 years for T3. These results
show that cutting cycles recommended by the forest law, 25 to 35 years, is insufficient and the results of the paired t-test showed that the remmainig forest of commercial species is still far from recovered. |