Navegando por Assunto "Silvicultura"

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Acesso aberto (Open Access)
Crescimento de espécies arbóreas em uma floresta natural de terra firme após a colheita de madeira e tratamentos silviculturais, no município de Paragominas, Pará, Brasil
(Universidade Federal de Santa Maria, 2015-12) SOUZA, Deivison Venício; CARVALHO, João Olegário Pereira de; MENDES, Fernanda da Silva; MELO, Lia de Oliveira; SILVA, José Natalino Macedo; JARDIM, Fernando Cristóvam da Silva
This paper deals with the effects of silvicultural treatments on growth rates of a terra firme natural forest after reduced impact logging (RIL). The study was carried out in the Rio Capim Forest Management Unit, which belongs to Cikel Brasil Verde Madeiras Ltda., located in the municipality of Paragominas, PA. The experimental area comprised 500 ha, where five treatments (100 ha each) each with four replications (25 ha each) were established. The replications were randomly distributed in the 500 ha sample area. The following treatments were applied: T1 - RIL + classical liberation thinning (girdling of competing trees) and climber cutting; T2 - RIL + modified liberation thinning (girdling of competing trees) and climber cutting; T3 - RIL + climber cutting; T6 - only RIL; T7 - unlogged forest (control). In the four years of monitoring forest, after logging and silvicultural treatments, T2 and T3 had the highest diameter growth rates. But the four-year period is not enough to suggest the best treatment, based on diameter growth rate, in response to girdling trees and climber cutting. At species level, growth rate varied between treatments and within treatments. In general, the lower diameter growth rates were observed in the unlogged forest.
Acesso aberto (Open Access)
Fomento florestal e sua função socioeconômica: estudo de caso no município de Almeirim (PA)
(2014-06) FERREIRA, Amanda Estefânia de Melo; PARRY, Luke Thomas Wyn; BARLOW, Bernard Josiah; VIEIRA, Ima Célia Guimarães; MORELO, Thiago Fonseca
Forest out-grower schemes "fimento florestal' are expanding in Brazilian, including Amazonia. This study examined the socio-economic implications of smallholder-led fomento florestal for eucalyptus production in Almeirim (PA). We interviewed both participating and non-participating farming households (total = 39). The projects offered low remuneration for household labor input and appeared to be financially unviable when contracted labour was necessary. The implementation of smallholder-led fomento florestal in farms with low capacity can cause a net reduction in income. This study provides an important baseline from which to redefine government policies relevant to the on-going expansion of fomento and development in the Amazon region.
Acesso aberto (Open Access)
Growth and survival of Sclerolobium paniculatum vogel and the relationship between rainfall and the increment in diameter at different planting spacings
(Universidade Federal do Pará, 2016-06) NARDUCCI, Tainah Silva; YARED, Jorge Alberto Gazel; BRIENZA JÚNIOR, Silvio
Sclerolobium paniculatum Vogel is a species that has good potential for reclamation of degraded soils. The aim of the investigation was to evaluate the growth and survival of the species and the influence of rainfall on growth in diameter as a function of different spacings (4 m x 2 m, 4 m x 3 m, and 4 m x 4 m). The results indicate that the temporal analysis (period from November 2007 to August 2013) detected significant differences (p ≤ 0.05) in height between the 4 m x 2 m and 4 m x 4 m spacings, while no significant difference in diameter was found between the 4 m x 2 m and 4 m x 3 m spacings. However, the statistical differences did not persist when the data was analyzed at seven and half years old. Regarding survival, a significant difference was observed only between the 4 m x 4 m spacing and the others, with superiority to the former. A strong correlation was found between rainfall and the increment in diameter of individuals in the broader spacings (R = 0.80 in the 4 m x 3 m spacing and R = 0.77 in the 4 m x 4 m spacing), while in the denser spacing the correlation was moderate (R = 0.56 in the 4 m x 2 m spacing). Since the spacings adopted did not influence tree growth by the end of the period, the choice will depend on other factors such as survival and costs of implementation and forestry management. Plantations in regions with larger rainfall amplitude may benefit the productivity of the species.
Acesso aberto (Open Access)
A influência do fomento florestal nos aspectos ambientais e socioeconômicos em estabelecimentos rurais na Amazônia
(Universidade Federal do Pará, 2012-01) FERREIRA, Amanda Estefânia de Melo; PARRY, Luke Thomas Wyn; http://lattes.cnpq.br/3567943056179690; BARLOW, Bernard Josiah; http://lattes.cnpq.br/8559847571278134
Amazonia possesses some of the highest levels of biodiversity the planet, and has a population of 25.469.352 million inhabitants. It is threatened by agricultural expansion edge effects and logging, increasing its sensitivity to the forest fires. Investments in perennial agriculture, tree plantations, and fire sensitive products could diminish the use of fire and the risk of wildfires. In recent year, large companies have incentivized smallholders to plant trees on their land, in a practice known as fomento florestal. This could have both negative and positive effects for the establishments that get involved, influencing the quality of life of the families, changing income, and promoting the permanence of the producer’s agriculture, and incorporating technical assistance and the transfer of technology. The objective of this study was to evaluate the influence of fomento florestal based on eucalyptus (Eucalyptus Urograndis), assessing the environmental and socioeconomics parameters in agricultural establishments in Amazonia. The implantation of perennial and fire-sensitive trees did not alter the use of the fire, and it even increased the fire use in the areas around the participating smallholdings. Another important aspect was the advance of forestry in the areas of secondary vegetation, culture and pastures, which in turn may have stimulated agricultural expansion in areas of forests. In socioeconomics terms, half of the interviewed particpants had presented per capita income less than half of the minimum wage. Fomento florestal offers low remuneration of manual labour and could even jeopardize future food security and agricultural income. However, it also appears to improve the social interactions in the between agriculturalists and increases capitalization by nine compared to not fomented. Overall, this study contributes to the debate about the politics of development in agricultural landscapes in Amazonia
Acesso aberto (Open Access)
Restauração florestal na Amazônia: uma análise a partir da concorrência de paradigmas e trajetórias tecnológicas na Região de Integração do Bico do Papagaio
(Universidade Federal do Pará, 2023-02-15) SILVA, Camila de Cássia do Socorro; MATTOS JÚNIOR, José Sampaio; http://lattes.cnpq.br/2288193304873040; FOLHES, Ricardo Theophilo; http://lattes.cnpq.br/5612208724254738
Natural resources are increasingly affected by the massive use that man makes when using them. As a consequence, we observe the instability of the climate, the increase of the seas, the melting of the polar ice caps, the degradation of the soils, the deforestation of the forests, among other effects. In several regions of the world, especially in the Amazon, forest restoration with its various methods has been a sustainable alternative to mitigate these effects. The discussion about technological trajectories in the Amazon can help in understanding the forest restoration agendas that multiply in this space, because it is in this environment that it is verified that technological trajectories establish different forms of production that may or may not take into account the original nature (the Amazon forest biome). Due to this, the objectives that guide this research analyzed the competition between different technological trajectories, in particular, T6 (silvicultural) and T2 (agroforestry) around forest restoration. The study region took place in Açailândia, a municipality belonging to Região de Integração do Bico do Papagaio (RIBP). To expose the competition between the different forms of forest restoration, it was decided to obtain the perception of four groups of agents, among which are the peasants representing agroforestry systems, the private sector representing reforestation with eucalyptus, the public sector and products of seedlings. Methodologically, the theoretical and methodological framework on technological trajectories in the Amazon was used. Primary and secondary data were collected, the first made from questionnaires and interviews and the secondary through platforms and official documents. The results indicated the different productive forces between the technological trajectories that were the focus of the study, since there was strong competition from T6 and even from T7 (soybean), while T2 continues to resist through agroforestry movements, despite the absence of public institutional, technical and financial support. In addition, the results show that despite the resistance of agroforestry movements, there is a strong pressure for natural resources coming from T6 and T7, mainly by land, processes that conjecture for the weakening of forest restoration by the most sustainable agroforestry methods, such as, are performed by T2.