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Regulating industrial forest concessions in Central Africa and South America

KARSENTY, Alain; DRIGO, Isabel Garcia; PIKETTY, Marie-Gabrielle; SINGER, Benjamin
Fonte: ELSEVIER SCIENCE BV Publicador: ELSEVIER SCIENCE BV
Tipo: Artigo de Revista Científica
Português
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Tropical countries face special specific problems in implementing sustainable forest management (SFM). In many countries, questions are raised on whether tropical forests should be publicly, commonly or privately owned and managed in order to enhance sustainability. Other debates also focus on whether small-scale enterprises are better positioned than large-scale industrial concessions to reduce poverty and attain sustainable management. In countries where large tracts of forest are state-owned, concessions are viewed as a means of delivering services of public and collective interest through an association of private investment and public regulation. However, the success of an industrial concession model in countries with large forest resource endowment to achieve multiple goals such as sustainable forest management and local/regional development depends on two critical assumptions. First, forest functions and services should be managed and maintained as public goods. In many cases, additional uses - and corresponding rights - can take place alongside logging activities. Industrial concessions can be more efficient than other tenure models (such as community-based forest management and small-scale enterprises) in achieving SFM, add value to raw material and comply with growing environmental norms. This is especially the case in market-remote areas with low population density and poor infrastructure. Secondly...

Variação da regeneração natural da vegetação arbórea no sub-bosque de Eucalyptus saligna Smith, manejado por talhadia, localizado no município de Itatinga, SP.; Variation of the natural regeneration of wood vegetation on Eucalyptus saligna Smith, understory managed through coppicing system (Itatinga, SP, Brazil).

Sartori, Maurício Scorsatto
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 05/02/2002 Português
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36.37%
Neste trabalho foi avaliada a variação espacial da regeneração natural das espécies nativas no sub-bosque de um povoamento de Eucalyptus saligna Smith. localizado na Estação Experimental de Itatinga do Departamento de Ciências Florestais da Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, que vem sendo manejado ha 50 anos pelo sistema de talhadia simples. A Estação Experimental de Itatinga ocupa uma área aproximada de 675 ha localizados na região fisiográfica denominada Planalto Ocidental Paulista. O uso da terra é caracterizado pelos plantios monoculturais de espécies exóticas, principalmente Eucalyptus sp. e Pinus sp., e fragmentos florestais naturais representativos de floresta estacional semidecidual, floresta ripária, cerradão e cerrado, em diferentes níveis de perturbação. A área experimental compreende 2 sítios distantes entre si em aproximadamente 250 metros e com desnível topográfico de 30 metros, diferenciados principalmente pela fitofisionomia da vegetação, declividade do terreno e pelas diferentes características de fertilidade e capacidade de retenção hídrica dos solos. Foram alocadas aleatoriamente 8 parcelas permanentes de 625 m 2 em cada sítio. Em cada parcela foi realizado o inventário das espécies nativas arbóreas ou arbustivas em via de regeneração...

Reflexos do manejo de resíduos florestais na produtividade, nutrição e fertilidade do solo em plantações de Eucalyptus grandis; Reflections of residue management in forest productivity, nutrition and soil fertility in plantations of Eucalyptus grandis

Rocha, José Henrique Tertulino
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 13/02/2014 Português
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36.44%
Até a década de 80, os resíduos florestais eram vistos apenas como empecilho para as operações de reforma das plantações de eucalipto. Este fato motivou a queima e a incorporação desses resíduos. Tinham-se também o conceito de que o eucalipto necessitava de um preparo de solo intensivo para atingir boas produtividades. Atualmente esses conceitos não existem mais, e todas as áreas florestais são estabelecidas sob o sistema de cultivo mínimo do solo, porém pressões quanto à utilização desses resíduos vêm surgindo. Com as restrições da compra de terras e as elevações dos preços dos combustíveis fósseis, esses resíduos estão sendo vistos como fonte alternativa de energia nas indústrias. Apesar de ser uma fonte de energia renovável, os benefícios da manutenção desses resíduos no campo não podem ser esquecidos. Este estudo mostra que áreas manejadas sob o sistema de cultivo mínimo, apresentam a mesma produção de madeira que áreas manejadas sob sistema de cultivo intensivo. A principal vantagem da manutenção dos resíduos florestais sobre o solo, que resulta em ganhos de produtividade em curto prazo, é a redução na exportação de nutrientes. Por esse motivo, quando esses resíduos são removidos...

India : Unlocking Opportunities for Forest-Dependent People in India, Volume 1, Main Report

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Português
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This study by the World Bank indicates that forests offer vast potential for poverty reduction and rural economic growth in India while also supporting critical national conservation goals. An estimated 275 million people in rural areas depend on forests for at least part of their livelihoods. Forest dwellers, which include a high proportion of tribals, are among the poorest and most vulnerable groups in society. The government of India has adopted Joint Forest Management as a principal approach for community-based forestry. The program now covers 27 percent of the national forest area across 27 states, and encompasses 85,000 village committees. Over the past decade, the Joint Forest Management model has been evolving from an approach heavily oriented towards commercial timber managed by state forest departments (with communities providing labor), to an approach more supportive of forest conservation with communities sharing benefits in return for assisting with limited management activities. Although this transition has been successful by some measures, most communities still fail to utilize the full potential of forests to improve local livelihoods. Forests are mainly used as a safety net during difficult economic periods, or for seasonal subsistence products like fuelwood and fodder. For communities to better exploit the untapped potential of forests...

Commercial Woodfuel Production : Experience from Three Locally Controlled Wood Production Models

World Bank
Fonte: Washington, DC Publicador: Washington, DC
Português
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Woodfuels (firewood and charcoal) are the dominant energy source and the leading forest product for most developing countries. Representing 60 to 80 percent of total wood consumption in these nations, woodfuels often account for 50 to 90 percent of all energy used. Although woodfuels are widely perceived as cheap and primitive sources of energy, commercial woodfuel markets are frequently very large, involve significant levels of finance, and provide an important source of income through the supply chain for the rural poor. However, the woodfuel sector in many developing countries operates informally and inefficiently, using out-dated technology and delivering little official revenue to the government. The unsustainable harvesting of woodfuels to supply large urban and industrial markets can also contribute to forest degradation and deforestation. Given the low carbon development opportunity presented by wood energy, predictions of significant growth in woodfuel demand make it vital that this industry is overhauled and modernized using new technologies...

From Users to Custodians : Changing Relations between People and the State in Forest Management in Tanzania

Wily, Liz Alden; Dewees, Peter A.
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Português
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Central control of forests takes management responsibility away from the communities most dependent on them, inevitably resulting in tensions. Like many African countries, Tanzania--which has forest or woodland cover over 30-40 percent of its land--established central forestry institutions at a time when there was little need for active management and protection because population pressures were low. But in the face of scarce public resources and burgeoning demand from the growing population for agricultural landand woodland products, there has been growing recognition of the need to bring individuals, local groups, and communities into the policy, planning, and management process if woodlands are to remain productive in the coming decades. Tanzania established its first three community-owned and -managed forest reserves in September 1994. Today, supported by substantive policy reforms that largely grew out of the early experiences with community-based management, more than 500 villages own and manage forest reserves...

Community Managed Forest Groups and Preferences for REDD+ Contract Attributes

Dissanayake, Sahan T. M.; Jha, Prakash; Adhikari, Bhim; Bista, Rajesh; Bluffstone, Randall; Luintel, Harisharan; Martinsson, Peter; Paudel, Naya Sharma; Somanathan, E.; Toman, Michael
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Trabalho em Andamento
Português
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56.77%
A significant portion of the world’s forests that are eligible for Reducing Emission from Deforestation and Forest Degradation, known as REDD , payments are community managed forests. However, there is little knowledge about preferences of households living in community managed forests for REDD contracts, or the opportunity costs of accepting REDD contracts for these communities. This paper uses a choice experiment survey of rural communities in Nepal to understand respondents’ preferences toward the institutional structure of REDD contracts. The sample is split across communities with community managed forests groups and those without community managed forest groups to see how prior involvement in community managed forest groups affects preferences. The results show that respondents care about how the payments are divided between households and communities, the severity of restrictions on firewood use, the restrictions on grazing, and the fairness of access to community managed forest resources as well as the level of payments. The preferences for REDD contracts are in general similar between community managed and non-community managed forest resource respondents...

Variable strength of forest stand attributes and weather conditions on the questing activity of Ixodes ricinus ticks over years in managed forests

Lauterbach, R.; Wells, K.; O'Hara, R.B.; Kalko, E.K.V.; Renner, S.C.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em //2013 Português
Relevância na Pesquisa
36.37%
Given the ever-increasing human impact through land use and climate change on the environment, we crucially need to achieve a better understanding of those factors that influence the questing activity of ixodid ticks, a major disease-transmitting vector in temperate forests. We investigated variation in the relative questing nymph densities of Ixodes ricinus in differently managed forest types for three years (2008–2010) in SW Germany by drag sampling. We used a hierarchical Bayesian modeling approach to examine the relative effects of habitat and weather and to consider possible nested structures of habitat and climate forces. The questing activity of nymphs was considerably larger in young forest successional stages of thicket compared with pole wood and timber stages. Questing nymph density increased markedly with milder winter temperatures. Generally, the relative strength of the various environmental forces on questing nymph density differed across years. In particular, winter temperature had a negative effect on tick activity across sites in 2008 in contrast to the overall effect of temperature across years. Our results suggest that forest management practices have important impacts on questing nymph density. Variable weather conditions...

Trait-dependent occupancy dynamics of birds in temperate forest landscapes: fine-scale observations in a hierarchical multi-species framework

Wells, K.; O'Hara, R.B.; Böhm, S.M.; Gockel, S.; Hemp, A.; Renner, S.C.; Pfeiffer, S.; Böhning-Gaese, K.; Kalko, E.K.V.
Fonte: Wiley Publicador: Wiley
Tipo: Artigo de Revista Científica
Publicado em //2012 Português
Relevância na Pesquisa
46.27%
Silvicultural practices lead to changes in forest composition and structure and may impact species diversity from the overall regional species pool to stand-level species occurrence. We explored to what extent fine-scale occupancy patterns in differently managed forest stands are driven by environment and ecological traits in three regions in Germany using a multi-species hierarchical model. We tested for the possible impact of environmental variables and ecological traits on occupancy dynamics in a joint modelling exercise while taking possible variation in coefficient estimates over years and plots into account. Bird species richness differed across regions and years, and trends in species richness across years were different in the three regions. On the species level, forest management affected occupancy of species in all regions, but only 3–5% of the total assemblage-level variation in occurrence probability was explained by either forest type and successional stage and < 1% by forest edge. On the assemblage level, bird occurrence decreased with body mass in all regions. Species with smaller breeding ranges had lower occurrence probabilities in one region, while later spring arrival decreased occurrence probabilities in the two other regions. Spatial variation in the effect size of trait covariates such as species phylogeny and breeding strata showed that variation in patch occupancy due to fine-scale differences in forest management is...

Effects of harvesting on spatial and temporal diversity of carbon stocks in a boreal forest landscape

Ter-Mikaelian, Michael T; Colombo, Stephen J; Chen, Jiaxin
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
Português
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36.55%
Carbon stocks in managed forests of Ontario, Canada, and in harvested wood products originated from these forests were estimated for 2010–2100. Simulations included four future forest harvesting scenarios based on historical harvesting levels (low, average, high, and maximum available) and a no-harvest scenario. In four harvesting scenarios, forest carbon stocks in Ontario's managed forest were estimated to range from 6202 to 6227 Mt C (millions of tons of carbon) in 2010, and from 6121 to 6428 Mt C by 2100. Inclusion of carbon stored in harvested wood products in use and in landfills changed the projected range in 2100 to 6710–6742 Mt C. For the no-harvest scenario, forest carbon stocks were projected to change from 6246 Mt C in 2010 to 6680 Mt C in 2100. Spatial variation in projected forest carbon stocks was strongly related to changes in forest age (r = 0.603), but had weak correlation with harvesting rates. For all managed forests in Ontario combined, projected carbon stocks in combined forest and harvested wood products converged to within 2% difference by 2100. The results suggest that harvesting in the boreal forest, if applied within limits of sustainable forest management, will eventually have a relatively small effect on long-term combined forest and wood products carbon stocks. However...

Variable Strength of Forest Stand Attributes and Weather Conditions on the Questing Activity of Ixodes ricinus Ticks over Years in Managed Forests

Lauterbach, Ralf; Wells, Konstans; O'Hara, Robert B.; Kalko, Elisabeth K. V.; Renner, Swen C.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 25/01/2013 Português
Relevância na Pesquisa
36.37%
Given the ever-increasing human impact through land use and climate change on the environment, we crucially need to achieve a better understanding of those factors that influence the questing activity of ixodid ticks, a major disease-transmitting vector in temperate forests. We investigated variation in the relative questing nymph densities of Ixodes ricinus in differently managed forest types for three years (2008–2010) in SW Germany by drag sampling. We used a hierarchical Bayesian modeling approach to examine the relative effects of habitat and weather and to consider possible nested structures of habitat and climate forces. The questing activity of nymphs was considerably larger in young forest successional stages of thicket compared with pole wood and timber stages. Questing nymph density increased markedly with milder winter temperatures. Generally, the relative strength of the various environmental forces on questing nymph density differed across years. In particular, winter temperature had a negative effect on tick activity across sites in 2008 in contrast to the overall effect of temperature across years. Our results suggest that forest management practices have important impacts on questing nymph density. Variable weather conditions...

Australia's ever-changing forests IV: Proceedings of the Fourth National Conference on Australian forest history

Fonte: ANU Centre for Resource and Environmental Studies (CRES); Australian Forest History Society; http://fennerschool.anu.edu.au/ Publicador: ANU Centre for Resource and Environmental Studies (CRES); Australian Forest History Society; http://fennerschool.anu.edu.au/
Tipo: Book; Published Version Formato: 406 pages
Português
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46.24%
CONTENTS: List of authors, page iii. Preface, page v. MEANING: 1. Our people: the Gubbi Gubbi / Eve Mumewa D. Fesl, page 3. 2. Aboriginal practices in East Gippsland forests precontact / Anitra Nelson, page 5. 3. Bikbus wokabaut: Human influences and wild nature in Australasia / Tom Heinsohn, page 17. 4. Trees age and memories change in the Avenues of Honour and Remembrance / John Dargavel, page 37. 5. Gardens, patriotism and the defence of forests / Libby Robin, page 54. CONSERVING: 6. Mismanagement of Royal forest in England, 1500-1640 / Sybil Jack, page 69. 7. Place of native forest in New Zealand's mental landscape, 1874 / Paul Star, page 85. 8. Nineteenth century origins of some rainforest nature reserves in northern New South Wales / Brett J. Stubbs, page 99. 9. Public and private ownership, government and forestry / Kenneth E. Jackson, page 115. MANAGING: 10. Hoop pine nursery techniques, 1916-1997 / John Huth, page 127. 11. Establishing professional forestry in Queensland: the Swain years, 1918-1932 / Kevin Frawley, page 144. 12. Charles Weston's contribution to afforestation and conservation in the federal capital / John Gray, page 165. 13. Bushfire, brown barrel and bloody cold weather: Bull's Head revisited / Matthew Higgins...

Duke Forest Carbon

Downing, Eric; Fulton, Erin; Strauss, Joshua
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Masters' project
Publicado em 09/12/2011 Português
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46.27%
Duke University is dedicated to achieving climate neutrality by 2024. With over 7000 acres of sustainably managed forest land, the Duke Forest has great potential for generating “in house” carbon offsets to help reach this goal. In this project we quantified the carbon represented in Duke’s forest holdings and analyzed the potential for generating emissions-reducing offsets based on Climate Action Reserve (CAR) and American Carbon Registry (ACR) protocols. Throughout the process we focused on three varieties of forest offsets: Avoided Conversion, Improved Forest Management, and Afforestation/Reforestation, comparing the relative advantages and disadvantages of each under CAR and ACR carbon accounting systems. After completing these carbon calculations we conducted a financial analysis of our results in order to make recommendations to the Duke Carbon Offsets Initiative concerning how they might apply these forest offsets toward the university’s carbon neutrality goal. Ultimately we concluded that the Duke Forest has the potential to produce significant amounts of high quality carbon offsets at a cost considerably below that of purchasing them on the voluntary market. The generation of Improved Forest Management offsets under CAR protocols proved particularly compatible with current Duke Forest management practices...

AN ANALYSIS OF WILLINGNESS TO PAY AND REASONS FOR PURCHASING CERTIFIED FOREST PRODUCTS

Jason, Elliott
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Masters' project
Publicado em 25/04/2014 Português
Relevância na Pesquisa
36.46%
Currently, around half a billion acres are certified around the world by the world’s top three certification organizations and this number continues to grow rapidly every day. However, consumer knowledge of sustainable forest management and forest certification does not appear to be growing. This lack of consumer awareness could be the reason why there is little evidence of a price premium for certified forest products in the market. The non-existence of a price premium may discourage landowners from electing to have their forest certified as sustainably managed. In order to encourage consumers to pay more for certified forest products, it is necessary to disseminate information about the benefits of forest certification and how certified forests are managed sustainably. This study aims to determine how much a typical household consumer knows about forest certification and whether or not they would prefer certified forest products over non-certified products. To answer these questions, 100 individuals were surveyed in Durham, North Carolina during the spring of 2014 to determine their preferences for printer paper, which is a frequently purchased forest product. The results indicated that 48% of respondents have not heard of forest certification and only 3% knew a lot about it. This demonstrates that there are great marketing opportunities for certification organizations...

Herpetofaunal species richness responses to forest landscape structure in Arkansas

Loehle, Craig; Wigley, T. Bently; Shipman, Paul; Fox, Stanley; Rutzmoser, Scott; Thill, Ronald; Melchiors, M. Anthony
Fonte: Elsevier: Forest Ecology and Management Publicador: Elsevier: Forest Ecology and Management
Tipo: Artigo de Revista Científica Formato: 37365 bytes; application/pdf
Português
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36.35%
Species accumulation curves were used to study relationships between herpetofaunal richness and habitat characteristics on four watersheds in Arkansas that differed markedly with respect to management intensity. Selected habitat characteristics were estimated for stands containing the sample points and within buffers with radii of 250, 500 m, and 1 km surrounding the sample points. Richness of all three herpetofaunal groups (amphibians, reptiles, and all herpetofauna) was greater in hardwood forests than in pine or mixed pine–hardwood. For all three groups, the youngest forest age class had the most species. For amphibians and total herpetofauna, richness declined as stand ages increased. Reptiles had the highest richness at sample points with the lowest class of stand basal area (BA), whereas amphibians were richest at points having the highest BA. In contrast to expectations, there was no effect of distance from water on richness of any taxa; however, we may have had incomplete data on the spatial distribution of small ponds outside the sample plots because they were not recorded in the GIS data. Results for distance to roads were ambiguous, but with more separation of compared curves as more plots were sampled, a positive influence of road proximity was suggested. There was a positive effect of buffer age diversity at the 250 m scale for all three herpetofaunal groups...

Projecting native forest inventory estimates from public to private tenures.

Brack, Cristopher
Fonte: Institute of Foresters of Australia Publicador: Institute of Foresters of Australia
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
46.37%
Inventory information on privately managed forest areas tends to be more variable and less available than for equivalent publicly managed forests. This paper reports on an examination of the timber volume on Tasmanian private and public native forests and demonstrates that the differences between tenures in terms of total (entire stem) volume (m3 ha-1) are significant but relatively small. The paper also demonstrates that information from public forest inventories may be used to generate auxiliary information that can improve the efficiency of sampling on equivalent private forests. Regression and variable probability sampling using auxiliary information generated from public forest inventories can reduce the need for establishing sample points in private forests to only 25% of that required under simple random sampling for a given level of precision.

Local winter deer density: Effects of forest structure and snow in a managed forest landscape

James D. A. Millington; Michael B. Walters; Megan S. Matonis; Jianguo Liu
Fonte: Nature Preceedings Publicador: Nature Preceedings
Tipo: Conferência ou Objeto de Conferência
Português
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*Background/Questions/Methods* White-tailed deer (_Odocoileus virginianus_) are a ‘keystone herbivore’ with the potential to cause tree regeneration failure and greatly affect vegetation dynamics, stand structure and ecological function of forests across eastern North America. In northern mixed conifer-hardwood forests, local winter-time deer populations are dependent on habitat characterized by patterns of forest cover that provide shelter from snow and cold temperatures (lowland conifer stands) in close proximity to winter food (deciduous hardwood stands). Stand structure may also influence winter spatial deer distribution. Consequently, modification of forest cover patterns and stand structure by timber harvesting will affect local spatial deer distributions, with potential ecological and economic consequences. Here, we ask if forest cover pattern and stand structure, and their interactions with snow depth, can explain winter deer density in the managed forests of the central Upper Peninsula of Michigan, USA. For each local winter deer density estimate (from fecal pellet counts) we calculate stand-level characteristics for surrounding ‘landscapes of influence’ of radius 200 m. For these data...

Structural analysis and multiple use of tree species in managed forest, Middle River Valley of Curuá-una, Pará.; ANÁLISE ESTRUTURAL E USO MÚLTIPLO DE ESPÉCIES ARBÓREAS EM FLORESTAS MANEJADAS NO MÉDIO VALE DO RIO CURUÁ-UNA, PARÁ

Vieira, Diego dos Santos; Universidade Federal do Vale do Jequitinhonha e Mucuri.; Gama, João Ricardo Vasconcellos; Universidade Federal do Oeste do Pará.; Oliveira, Márcio Leles Romarco de; Universidade Federal do Vale do Jequitinhonha e Mucuri; Ribei
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 27/03/2015 Português
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56.59%
O objetivo deste estudo foi avaliar alterações florísticas e estruturais ocorridas em áreas de Floresta Ombrófila Densa no Pará, em decorrência das atividades de exploração de impacto reduzido. Para isso, foram utilizadas duas áreas de floresta não manejada (FNM1 e FNM2) e duas de floresta manejada (FM1 e FM2), explorada há quatro anos, com intensidade de corte de 30 m³.ha-1. Utilizou-se amostragem estratificada, com alocação de 24 parcelas de 28 x 350 m, sendo 12 na FM1 e 12 na FNM1, e 20 parcelas de 50 x 200 m, sendo nove na FM2 e 11 na FNM2, mensurando-se todos os indivíduos com DAP ≥ 10 cm. O delineamento foi inteiramente casualizado, com número diferente de repetições. No período de quatro anos após a exploração, ocorreram alterações não significativas na composição florística e abundância de indivíduos, no entanto os índices de Shannon calculados para as áreas diferiram significativamente. A espécie de maior valor de importância na FM1 e FNM1 foi Rinorea guianensis Aubl. e na FM2 e FNM2 foram Licania kunthiana Hook.f. e Richardella macrophylla (Lam.) Aubrév., respectivamente. Após quatro anos da colheita, foram identificadas diferenças significativas apenas no volume total e na dominância absoluta entre FM2 e FNM2.AbstractStructural analysis and multiple use of tree species in managed forest...

DIAMETER STRUCTURE AND PHYTOSOCIOLOGICAL FREQUENCY OF A “TERRA FIRME” AMAZON FOREST, BEFORE AND AFTER SELECTIVE CUTTING; DIAMETER STRUCTURE AND PHYTOSOCIOLOGICAL FREQUENCY OF A “TERRA FIRME” AMAZON FOREST, BEFORE AND AFTER SELECTIVE CUTTING

da Cunha, Ulisses Silva; universidade Federal do Amazonas; Machado, Sebastião do Amaral; Universidade Federal do Paraná; Filho, Afonso Figueiredo; Universiddade do Centro-Oeste do Paraná; de Freitas, Joberto Veloso; Universidade Federal do Amazonas
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 14/05/2012 Português
Relevância na Pesquisa
46.45%
This article aims to characterize horizontal and diameter structure of a managed forest using graphic expression techniques. Data for this research is result of complete forest inventory (census) carried out from a block of 800 hectares, before and after selective cutting, inside Tapajós National Forest, located in the Municipality of Belterra, State of Pará, Brazil. The analysis revealed that, in relation to horizontal structure, intense cutting resulted in changes of different levels mainly to phytosociological frequency of some species, such as, Manilkara huberi, Carapa guianensis and Tabebuia serratifolia. The diameter structure of some species, such as Sextonia rubra and Dipteryx odorata, revealed changes after selective cutting under technically acceptable rates, because the stock levels of some diameter classes surpassed the limits of balance observed for polycyclic systems with silviculture based on natural regeneration. The inclusion of graphics in the harvest operating plan for the 10 most important species listed in forest management, that is, before and after selective cutting, would lead to the desirable structure maintenance.; This article aims to characterize horizontal and diameter structure of a managed forest using graphic expression techniques. Data for this research is result of complete forest inventory (census) carried out from a block of 800 hectares...

PROJECTION OF DIAMETRIC DISTRIBUTION AND CARBON STOCK OF A MANAGED FOREST IN MANAUS/AM; PROJECTION OF DIAMETRIC DISTRIBUTION AND CARBON STOCK OF A MANAGED FOREST IN MANAUS/AM

Souza, Cintia Rodrigues de; Embrapa Amazônia Ocidental; Azevedo, Celso Paulo de; Embrapa Amazônia Ocidental; Rossi, Luiz Marcelo Brum; Embrapa Amazônia Ocidental; dos Santos, Joaquim; Instituto Nacional de Pesquisas da Amazônia - INPA; Higuchi, Niro;
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 27/01/2014 Português
Relevância na Pesquisa
46.47%
AbstractThe projection of forest growth is important for forest management, to plan the subsequent cutting cycles and to show the tendencies that the forest will present in the future. This study evaluated the use of a stochastic model - the Markov Chain - in the projection of the future diametric distribution and carbon stock of a forest subjected to experimental selective logging in Manaus / AM. The data used were obtained from an experiment conducted since the 1980s by the Instituto Nacional de Pesquisas da Amazônia (Inpa). The forest inventories were conducted in the years 2005, 2007, 2009 and 2010. The main variable used was the diameter at breast height (DBH). The Markov Chain was used to project the diameter distribution and the carbon stock for 2015. With respect to the stock of carbon expected, this should exceed the existing stock in 2010, reaching about 157 t/ha. With these results it is possible to conclude that, if the dynamics projection will be confirmed, the studied forest will continue growing and increasing its carbon stock, thus acting as a CO2 sink.Keywords: Markov Chain; forest dynamics; forest management; climate change. ; AbstractThe projection of forest growth is important for forest management, to plan the subsequent cutting cycles and to show the tendencies that the forest will present in the future. This study evaluated the use of a stochastic model - the Markov Chain - in the projection of the future diametric distribution and carbon stock of a forest subjected to experimental selective logging in Manaus / AM. The data used were obtained from an experiment conducted since the 1980s by the Instituto Nacional de Pesquisas da Amazônia (Inpa). The forest inventories were conducted in the years 2005...