Consulta: subjectFacets:"Forest structure"
Registros recuperados: 11
Data/hora: 13/06/2024 23:20:20

Aprovechamiento forestal y su impacto en la vegetación y propiedades físicas del suelo en Santa Catarina Ixtepeji, Oaxaca.
Provedor de dados: 32
Autores: Luna Bautista, Lizbeth.
Con la finalidad de  conocer los efectos del manejo forestal sobre el componente vegetal y el suelo forestal en rodales bajo diferentes tratamientos silvícolas y tiempo de aplicación, se llevó a cabo la presente investigación en la comunidad de Santa Catarina Ixtepeji, Oaxaca. Se eligieron sitios con cuatro tratamientos silvícolas (Árboles Padre 2011 y 1998, Cortas de Selección 1998, Aclareo Ligero 2011) así como en áreas sin manejo como punto de comparación. Se analizó la riqueza, la composición y la diversidad de la vegetación en áreas muestreadas, además del Índice de Valor de Importancia (IVI) para el arbolado y algunas propiedades físicas del suelo como la densidad aparente, la resistencia mecánica y la humedad del suelo. En el área bajo estudio se...
Palavras-chave: Diversidad vegetal total; Estructura arbórea; Actividad forestal; Suelo forestal; Forest diversity; Forest structure; Silvicultural management; Forest soils; Ciencias Forestales; Maestría.
Ano: 2014
URL: http://hdl.handle.net/10521/2327

Silviculture's Role in Managing Boreal Forests
Provedor de dados: 7
Autores: Graham, Russell T; USDA Forest Service, Rocky Mountain Research Station; rgraham/rmrs_moscow@fs.fed.us; Jain, Theresa B; USDA Forest Service, Rocky Mountain Research Station; tjain/rmrs_moscow@fs.fed.us.
Boreal forests, which are often undeveloped, are a major source of raw materials for many countries. They are circumpolar in extent and occupy a belt to a width of 1000 km in certain regions. Various conifer and hardwood species ranging from true firs to poplars grow in boreal forests. These species exhibit a wide range of shade tolerance and growth characteristics, and occupy different successional positions. The climate is subarctic, with short growing seasons, and the soils are shallow. Both wildfires and timber harvesting play an important role in shaping the structure and composition of boreal forests. Both uneven-aged and even-aged silvicultural systems can be used to produce commercial harvests, but systems can also be designed to meet a variety of...
Tipo: Peer-Reviewed Reports
Palavras-chave: Boreal forest; Even-aged stands; Forest composition; Forest management; Forest structure; Global timber markets; Silvicultural systems; Subarctic; Uneven-aged stands.
Ano: 1998

Forest Management Approaches for Coping with the Uncertainty of Climate Change: Trade-Offs in Service Provisioning and Adaptability
Provedor de dados: 7
Autores: Wagner, Sven; Chair of Silviculture, TU-Dresden; wagner@forst.tu-dresden.de; Nocentini, Susanna; Department of Agricultural, Food and Forestry Systems, University of Florence; susanna.nocentini@unifi.it; Huth, Franka; Chair of Silviculture, TU-Dresden; mario@forst.tu-dresden.de; Hoogstra-Klein, Marjanke; Forest and Nature Conservation Policy Group, Wageningen University; Marjanke.Hoogstra@wur.nl.
The issue of rapid change in environmental conditions under which ecosystem processes and human interventions will take place in the future is relatively new to forestry, whereas the provision of ecosystem services, e.g., timber or fresh water, is at the very heart of the original concept of forest management. Forest managers have developed ambitious deterministic approaches to provide the services demanded, and thus the use of deterministic approaches for adapting to climate change seem to be a logical continuation. However, as uncertainty about the intensity of climate change is high, forest managers need to answer this uncertainty conceptually. One may envision an indeterministic approach to cope with this uncertainty; but how the services will be...
Tipo: Peer-Reviewed Reports
Palavras-chave: Climate change; Ecological resilience; Ecosystem services; Forest management strategies; Flexibility; Forest structure; Uncertainty.
Ano: 2014

Wildfire and Spatial Patterns in Forests in Northwestern Mexico: The United States Wishes It Had Similar Fire Problems
Provedor de dados: 7
Autores: Stephens, Scott L; ESPM Department University of California, Berkeley; stephens@nature.berkeley.edu; Fry, Danny L.; ESPM Department University of California, Berkeley; dfry@nature.berkeley.edu.
Knowledge of the ecological effect of wildfire is important to resource managers, especially from forests in which past anthropogenic influences, e.g., fire suppression and timber harvesting, have been limited. Changes to forest structure and regeneration patterns were documented in a relatively unique old-growth Jeffrey pine-mixed conifer forest in northwestern Mexico after a July 2003 wildfire. This forested area has never been harvested and fire suppression did not begin until the 1970s. Fire effects were moderate especially considering that the wildfire occurred at the end of a severe, multi-year (1999-2003) drought. Shrub consumption was an important factor in tree mortality and the dominance of Jeffrey pine increased after fire. The Baja California...
Tipo: Peer-Reviewed Reports
Palavras-chave: Baja California; Forest resistance; Forest structure; Jeffrey pine; Mixed conifer; Ponderosa pine; Regeneration; Resilience; Sierra San Pedro Martir; Spatial heterogeneity.
Ano: 2008

A new technique for inventory of permanent plots in tropical forests: a case study from lowland dipterocarp forest in Kuala Belalong, Brunei Darussalam
Provedor de dados: 16
Autores: Hédl, R.; Svátek, M.; Dančák, M.; Rodzay, A.W.; Salleh, M.A.B.; Kamariah, A.S.
This paper describes a new technique for inventory of permanent plots in tropical forests and presents the results of its application in a 1 ha permanent plot in a lowland dipterocarp forest at Kuala Belalong, Ulu Temburong National Park, Brunei Darussalam. The technique is based on mapping of positions of tree individuals in three-dimensional space with a high accuracy. Measuring set consists of a distance measuring device (laser rangefinder) and a electronic compass supplying data to a field computer with specialized software (Field-Map®). This method is faster and more exact than methods based on Cartesian grids established in the field. As an example, inventories from 2000 and 2007 of the plot mentioned are compared concerning presence, taxonomical...
Tipo: Article / Letter to the editor
Palavras-chave: Electronic compass; Field-map; Forest inventory; Forest structure; Laser rangefinder; Lowland dipterocarp forest; Permanent plots; Taxonomic diversity.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/524957

Influence of bamboo dieback on arboreal diversity in a subtropical forest fragment
Provedor de dados: 97
Autores: Capellesso,Elivane Salete; Weirich,Rafael; Dariva,Giamarco; Sausen,Tanise Luisa; Zanin,Elisabete Maria.
BACKGROUND: The vegetation structure and dynamics in subtropical forest fragments is influenced by the bamboo density. After the reproductive events followed by the death of the bamboos, is critical to understanding community structure and regeneration processes over time. The aim of this study was to evaluate temporally the influence of height and density of Merostachys multiramea on the richness, density and diversity of tree species after the event of bamboo dieback. The study was conducted in subtropical forest in southern Brazil, characterized by intense fragmentation of habitats, which facilitates the establishment of bamboo species RESULTS: We observed an increase in bamboo height over time, as well as an increase in the number of individuals...
Tipo: Journal article
Palavras-chave: Merostachys multiramea; Regeneration dynamic; Gaps; Forest structure; Seedlings.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100001

Structure of mixed ombrophyllous forests with Araucaria angustifolia (Araucariaceae) under external stress in Southern Brazil.
Provedor de dados: 119
Autores: VIBRANS, A. C.; SEVEGNANI, L.; UHLMANN, A.; SCHORN, L. A.; SOBRAL, M. G.; GASPER, A. L. de; LINGNER, D. V.; BROGNI, E.; KLEMZ, G.; GODOY, M. B.; VERDI, M.
This study is part of the Floristic and Forest Inventory of Santa Catarina, conceived to evaluate forest resources, species composition and structure of forest remnants, providing information to update forest conservation and land use policy in Southern Brazilian State of Santa Catarina (95 000km²). In accordance to the Brazilian National Forest Inventory (IFN-BR), the inventory applies systematic sampling, with 440 clusters containing four crosswise 1 000m² plots (20x50m) each, located on a 10x10km grid overlaid to land use map based on classification of SPOT-4 images from 2005. Within the sample units, all woody individuals of the main stratum (DBH?10cm) are measured and collected (fertile and sterile), if not undoubtedly identified in field....
Tipo: Separatas
Palavras-chave: Regional forest inventory; Forest structure; Human imacts on forests; Santa catarina; Floresta ombrófila mista.; Araucária Angustifólia; Inventário Florestal.
Ano: 2011
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/907532

Alternative criteria to achieve sustainable management of Mezilaurus itauba in the Brazilian Amazon.
Provedor de dados: 119
Autores: BRAZ, E. M.; CANETT, A.; MATTOS, P. P. de; BASSO, R. O.; FIGUEIREDO FILHO, A.
Os objetivos deste trabalho foram avaliar os parâmetros da legislação brasileira para o manejo de florestas tropicais quanto à recuperação da floresta e propor critérios alternativos para alcançar sua sustentabilidade, utilizando Mezilaurus itauba (Meisn.) Taub. ex Mez como caso de estudo. A estrutura diamétrica foi obtida de inventário 100% em um talhão de 500 ha. Os dados de crescimento, recrutamento e mortalidade de M. itauba foram adquiridos de 2 parcelas de 50 ha instaladas no talhão, em que todas as espécies comerciais foram medidas antes e após 7 anos da exploração. Foram avaliadas previamente a estrutura da espécie e sua classe diamétrica mais produtiva em volume. Posteriormente, foi simulada a recuperação em volume para os diâmetros limite de...
Tipo: Artigo de periódico
Palavras-chave: Estrutura florestal; Diâmetro mínimo de corte; Manejo florestal; Forest structure; Minimum logging diameter; Mezilaurus Itauba; Espécie Nativa; Floresta Tropical; Tropical forests.
Ano: 2018
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103287

Floristic, edaphic and structural characteristics of flooded and unflooded forests in the lower Rio Purús region of central Amazonia, Brazil
Provedor de dados: 36
Autores: Haugaasen,Torbjørn; Peres,Carlos Augusto.
Despite a natural history interest in the early 1900s, relatively little ecological research has been carried out in the Rio Purús basin of central Amazonia, Brazil. Here we describe a new study area in the region of Lago Uauaçú with an emphasis on the climate, forest structure and composition, and soil characteristics between adjacent unflooded (terra firme) and seasonally inundated forests; situated within both the white-water (várzea) and black-water (igapó) drainage systems that dominate the landscape. The climate was found to be typical of that of the central Amazon. Várzea forest soils had high concentrations of nutrients, while terra firme and igapó soils were comparatively nutrient-poor. Terra firme forests were the most floristically diverse...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Floodplain forest; Floristic composition; Forest structure; Soil nutrients.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672006000100005

Post-fire regeneration in seasonally dry tropical forest fragments in southeastern Brazil
Provedor de dados: 42
Autores: COSTA,MAYKE B.; MENEZES,LUIS FERNANDO T. DE; NASCIMENTO,MARCELO T.
ABSTRACT Seasonally dry tropical forest is one of the highly threatened biome. However, studies on the effect of fire on these tree communities are still scarce. In this context, a floristic and structural survey in three forest areas in the southeast of Brazil that were affected by fire between 14 and 25 years ago was performed with the objective of evaluating post-fire regeneration. In each site, five systematically placed plots (25 m x 25 m each) were established. The more recently burnt site had significantly lower values of richness and diversity than the other two sites. However, the sites did not differ in density and basal area. Annona dolabripetala, Astronium concinnum, Joannesia princeps and Polyandrococos caudescens were within the 10 most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic forest; Fire ecology; Forest succession; Forest structure; Post-fire recovery.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602687

Arboreous vegetation of an alluvial riparian forest and their soil relations: Porto Rico island, Paraná river, Brazil
Provedor de dados: 52
Autores: Campos,João Batista; Souza,Maria Conceição de.
The dynamics of alluvial deposits in floodplains forms islands and sandbanks. Deposits frequently accumulate at the river margins and on islands with consequent side growths. One of these sandbanks which started to form in 1952 annexed an area of 12.4ha to the Porto Rico island (53º15’W and 22º45’S). At present a forest fragment of approximately 2.0 ha exists in this place. The structural analysis of arboreous vegetation of this fragment showed a floristic gradient related to the physical and chemical variations of the substratum. High density of pioneer species associated to the absence of recruitment of new individuals of these and other successional categories indicated that the forest was impaired in its succession process. This fact could be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alluvial forest; Floodplain; Forest structure; Phytosociology; Riparian vegetation; Succession.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000200004