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Registros recuperados: 34 | |
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OLIVEIRA, M. V. N. d'; BROADBENT, E. N.; OLIVEIRA, L. C. de; ALMEIDA, D. R. A.; PAPA, D. de A.; FERREIRA, M. E.; ZAMBRANO, A. M. A.; SILVA, C. A.; AVINO, F. S.; PRATA, G. A.; MELLO, R. A.; FIGUEIREDO, E. O.; JORGE, L. A. de C.; JUNIOR, L.; ALBUQUERQUE, R. W.; BRANCALION, P. H. S.; WILKINSON, B.; COSTA, M. O. da. |
Tropical forests are often located in dicult-to-access areas, which make high-quality forest structure information dicult and expensive to obtain by traditional field-based approaches. LiDAR (acronym for Light Detection And Ranging) data have been used throughout the world to produce time-ecient and wall-to-wall structural parameter estimates for monitoring in native and commercial forests. In this study, we compare products and aboveground biomass (AGB) estimations from LiDAR data acquired using an aircraft-borne system in 2015 and data collected by the unmanned aerial vehicle (UAV)-based GatorEye Unmanned Flying Laboratory in 2017 for ten forest inventory plots located in the Chico Mendes Extractive Reserve in Acre state, southwestern Brazilian Amazon.... |
Tipo: Artigo de periódico |
Palavras-chave: Bosques tropicales; Inventario forestal; Monitoreo; Biomassa aérea; Teledetección; Vehículos aéreos no tripulados; Drone; GatorEye; Seringal Filipinas (AC); RESEX Chico Mendes; Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Floresta Tropical; Inventário Florestal; Reconhecimento Florestal; Estimativa; Sensoriamento Remoto; Raio Laser; Tropical forests; Forest inventory; Monitoring; Aboveground biomass; Remote sensing; Unmanned aerial vehicles; Lidar. |
Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1122818 |
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NICODEMO, M. L. F.; MULLER, M. D.; CARPANEZZI, A. A.; PORFIRIO-DA-SILVA, V.. |
O objetivo deste estudo foi selecionar equações alométricas para predição da biomassa aérea total e nos compartimentos aéreos de capixingui com 4,5 anos estabelecidas em um sistema silviagrícola. Foram tomadas medidas dendrométricas e utilizou-se o método destrutivo para a estimação da biomassa, com a separação dos componentes em tronco, galhos e folhas. Foram ajustados e comparados quatro modelos alométricos, sendo dois de simples entrada e dois de dupla entrada. Como variáveis preditoras foram considerados o diâmetro à altura do peito (DAP), diâmetro de colo (D colo), diâmetro de copa (Dc) e altura total (H). A biomassa total estimada foi de 17,3 t.ha-1, equivalente a 86,6 kg por árvore. Todos os modelos apresentaram ajustes satisfatórios (R2aj>0,85)... |
Tipo: Separatas |
Palavras-chave: Capixingui; Sistema agroflorestal; Sistemas de integração da produção; Modelagem; Biomassa; Croton floribundus; Agroforestry; Integrated agricultural systems; Models; Aboveground biomass. |
Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1045186 |
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goroshi, sheshakumar k. |
The present experiment was carried out to assess influence and inter-relationships of soil properties in grasslands of three wildlife protected national parks in Central India. Aboveground biomass samples of grass and soil samples were collected during different seasons based on specified measurement protocol by the state forest department. Aboveground biomass of grass demonstrated a characteristic growth pattern throughout the year, increased and achieved maximum biomass during at the end of rainy season (September), while started decreasing and attained minimum biomass during pre-summer (March) season. Mean aboveground biomass in the study regions was varied from 2.03 (Bandhavgadh National Park) to 5.44 Mg ha-1 (Kanha National Park) with an average... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Grassland; Aboveground biomass; Soil moisture; Soil properties; Central India. |
Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2535 |
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FIGUEIREDO, E. O.; PEREIRA, N. W. V.; WADT, L. H. de O.. |
O modelo de ocupação da Amazônia, implementado nas últimas décadas, pouco considerou as especificidades dos distintos ecossistemas florestais existentes na região. Quando se considera a dimensão territorial da Amazônia e os impactos decorrentes do desflorestamento e conseqüente processo de fragmentação de florestas, o fato ganha importância global. Este trabalho faz parte do projeto "Efeito do processo de fragmentação florestal na sustentabilidade de alguns ecossistemas periféricos aos eixos rodoviários no sudeste acreano", financiado pelo Programa Nacional de Diversidade Biológica (Pronabio), e foi desenvolvido num fragmento florestal localizado à margem direita da Rodovia Federal BR-364, km 30, sentido Rio Branco/Porto Velho, no município de Rio Branco,... |
Tipo: Séries anteriores (INFOTECA-E) |
Palavras-chave: Fragmentação florestal; Biomassa aérea; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Bosques tropicales; Biomasa aérea; Fragmentación de hábitats; Reservorios de carbono.; Floresta tropical; Ecossistema; Degradação ambiental; Impacto ambiental; Biomassa; Carbono; Estoque; Tropical forests; Habitat fragmentation; Aboveground biomass; Carbon sinks; Environmental impact.. |
Ano: 2000 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/495836 |
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PADILHA, M. C. de C.; SALAZAR, D. U.; DEMATTÊ, J. A. M.; LOEBMANN, D. G. dos S. W.; VICENTE, L. E.. |
Resumo: A quantificação do carbono orgânico do solo (COS) é de grande importância para a agricultura e o uso sustentável da terra, porém, ocorrem dificuldades para estimá-lo em grandes áreas, como o alto custo da amostragem de solo e dos preparos em laboratório. Há abordagens que podem facilitar a estimativa do COS, como o uso de imagens de satélite e a aplicação de modelos estatísticos baseados em índices de vegetação e nas bandas espectrais do satélite Landsat. Neste estudo foi proposta a avaliação de índices espectrais de vegetação (NDMI, EVI e o índice de biomassa aérea da vegetação (BAV), proposto pelos autores) a partir de dados ótico-orbitais da série Landsat (OLI, TM) para estimativa de teor de COS. Estatisticamente, o coeficiente de determinação... |
Tipo: Separatas |
Palavras-chave: Biomassa aérea da vegetação; Agricultura de baixo carbono; Série temporal; Aboveground vegetation biomass; Low carbon agriculture; Sensoriamento remoto; Vegetação; Solo; Carbono.; Remote sensing; Aboveground biomass; Time series analysis. |
Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1104985 |
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MEYER, V.; SAATCHI, S.; CLARCK, D. B.; KELLER, M.; VICENT, G.; FERRAZ, A.; ESPÍRITO-SANTO, F.; OLIVEIRA, M. V. N. d'; KAKI, D.; CHAVE, J.. |
Large tropical trees store significant amounts of carbon in woody components and their distribution plays an important role in forest carbon stocks and dynamics. Here, we explore the Properties of a new lidar-derived index, the large tree canopy area (LCA) defined as the area occupied by canopy above a reference height. We hypothesize that this simple measure of forest structure representing the crown area of large canopy trees could consistently explain the landscape variations in forest volume and aboveground biomass (AGB) across a range of climate and edaphic conditions. To test this hypothesis, we assembled a unique dataset of high-resolution airborne light detection and ranging (lidar) and ground inventory data in nine undisturbed old-growth... |
Tipo: Artigo de periódico |
Palavras-chave: Floresta neotropical; Neotropical forests; Bosques neotropicales; Teledetección; Inventario forestal; Dossel; Cubierta forestal; Biomassa aérea; Reservorios de carbono; Old-grow lowland; Planícies antigas; Planicies antiguas; Sensoriamento Remoto; Inventário Florestal; Raio Laser; Carbono; Estoque; Remote sensing; Lasers; Lidar; Forest inventory; Forest canopy; Aboveground biomass; Carbon sinks. |
Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1092386 |
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ELIAS, F.; FERREIRA, J. N.; RESENDE, A. F.; BERENGUER, E.; FRANÇA, F.; SMITH, C. C.; SCHWARTZ, G.; NASCIMENTO, R. O.; GUEDES, M.; ROSSI, L. C.; SEIXAS, M. M. M. de; SILVA, C. M. da; BARLOW, J.. |
Secondary forests (SFs) growing on previously cleared land could be a low-cost climate change mitigation strategy due to their potential to sequester CO2. However, given widespread changes in climate and land-use in the Amazon in the past 20 years, it is not clear whether current rates of carbon uptake by SFs reflect estimates based on dividing the carbon stock by the estimated age of the forest. This is important, as differences between methodological approaches could lead to important discrepancies in estimates of carbon accumulation. Furthermore, we know little about how carbon uptake rates of secondary forests vary across some of the most deforested regions of the Amazon, where reforestation actions are most needed. Here, we compare the rates of carbon... |
Tipo: Artigo de periódico |
Palavras-chave: Biomassa; Regeneração Natural; Regeneração; Natureza; Aboveground biomass; Natural regeneration. |
Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1149719 |
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ALMEIDA, D. R. A. de; ZAMBRANO, A. M. A.; BROADBENT, E. N.; WENDT, A. L.; FOSTER, P.; WILKINSON, B. E.; SALK, C.; PAPA, D. de A.; STARK, S. C.; VALBUENA, R.; GORGENS, E. B.; SILVA, C. A.; BRANCALION, P. H. S.; FAGAN, M.; MELI, P.; CHAZDON, R.. |
Drone-based remote sensing is a promising new technology that combines the benefits of ground-based and satellite-derived forest monitoring by collecting fine-scale data over relatively large areas in a cost-effective manner. Here, we explore the potential of the GatorEye drone-lidar system to monitor tropical forest succession by canopy structural attributes including canopy height, spatial heterogeneity, gap fraction, leaf area density (LAD) vertical distribution, canopy Shannon index (an index of LAD), leaf area index (LAI), and understory LAI. We focus on these variables? relationship to aboveground biomass (AGB) stocks and species diversity. In the Caribbean lowlands of northeastern Costa Rica, we analyze nine tropical forests stands (seven... |
Tipo: Artigo de periódico |
Palavras-chave: Drone; GatorEye; Aerial surveys; Regeneração florestal; Biomassa aérea; Bosques lluviosos; Monitoreo; Restauración de bosques; Bosques secundarios; Biomasa aérea; Teledetección; Vehículos aéreos no tripulados; Sarapiquí; Heredia Province; Caribbean lowlands; Northeastern Costa Rica; Floresta Tropical; Reconhecimento Florestal; Floresta Secundaria; Sensoriamento Remoto; Raio Laser; Rain forests; Monitoring; Forest restoration; Secondary forests; Aboveground biomass; Remote sensing; Unmanned aerial vehicles; Lidar. |
Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1124130 |
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Silvopastoral systems of the Swiss Jura Mountains serve as a traditional source of forage and timber in the subalpine vegetation belt, but their vulnerability to land use and climate change puts their future sustainability at stake. We coupled experimental and modeling approaches to assess the impact of climate change on the pasture-woodland landscape. We drew conclusions on the resistance potential of wooded pastures with different management intensities by sampling along a canopy cover gradient. This gradient spanned from unwooded pastures associated with intensive farming to densely wooded pastures associated with extensive farming. Transplanted mesocosms of these ecosystems placed at warmer and drier conditions provided experimental evidence that... |
Tipo: Peer-Reviewed Reports |
Palavras-chave: Aboveground biomass; Drought; Ecotone; Grassland; Pasture; Silvopastoral system; Subalpine; Transplantation; Woodland. |
Ano: 2013 |
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Sabadin,Patricia; Gómez,Miguel; Ginocchio,Rosanna; Peña,Iván; Mujica,Ana María; Montenegro,Gloria. |
This research aimed to determine the diversity and biomass of species in burned in the Jardín Botánico Nacional of Viña del Mar (JBN), region of Valparaíso, Chile (Lat. S 33° 02’ and Long. 71° 35’ O) from April to December 2012. Three sites were selected that were located on slopes with the same exposure: 1) site burned by fire in 2012, 2) site burned by fire in 2003, and 3) control site corresponding to an area without previous fires. Both shrub and herbaceous species were studied. The cover of shrubs, geophytes and therophytes was determined as well as the aboveground and belowground biomass of geophytes, with special attention paid to Oziroe arida. When O. arida was present, the diameter of its bulbs were studied. All information was... |
Tipo: Journal article |
Palavras-chave: Aboveground biomass; Belowground biomass; Cover; Fires; Geophytes; Oziroe arida; Shrub species; Therophytes. |
Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000300010 |
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CUNHA, R. M. da; FIGUEIREDO, E. O.; OLIVEIRA, M. V. N. d'; PAPA, D. de A.. |
Este trabalho objetivou avaliar o uso combinado de sensores Lidar e RGB em ARP para quantificar as perturbações decorrentes da extração seletiva em área de manejo florestal. O estudo foi feito em uma área de exploração na Floresta Estadual do Antimary (FEA), no Estado do Acre. Foram utilizadas 10 parcelas de 1ha, para estimar biomassa seca acima do solo (BSAS) para toda área a partir de métricas extraídas do voo Lidar realizado antes da exploração. O voo ARP ocorreu após a exploração para classificação e quantificação das áreas impactadas por clareiras, estradas e pátios. A área de impacto total representou 13 % da área do estudo e pela perda de BSAS 31,5 Mg.ha-1, destes, as clareiras corresponderam a 82% da área total impactada e por 26,1 Mg.ha-1 da BSAS... |
Tipo: Parte de livro |
Palavras-chave: Silvicultura sustentable; Explotación forestal; Extração seletiva; Biomasa aérea; Acumulación de materia seca; Estimación; Teledetección; Vehículos aéreos no tripulados; Drone; Sensores; Floresta Estadual do Antimary (AC); Bujari (AC); Sena Madureira (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Administração Florestal; Extração da Madeira; Biomassa; Matéria Seca; Estimativa; Impacto Ambiental; Sensoriamento Remoto; Sustainable forestry; Logging; Aboveground biomass; Dry matter accumulation; Estimation; Environmental impact; Remote sensing; Sensors (equipment); Lidar; Unmanned aerial vehicles. |
Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1110087 |
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Lu,Dengsheng; Batistella,Mateus. |
Many texture measures have been developed and used for improving land-cover classification accuracy, but rarely has research examined the role of textures in improving the performance of aboveground biomass estimations. The relationship between texture and biomass is poorly understood. This paper used Landsat Thematic Mapper (TM) data to explore relationships between TM image textures and aboveground biomass in Rondônia, Brazilian Amazon. Eight grey level co-occurrence matrix (GLCM) based texture measures (i.e., mean, variance, homogeneity, contrast, dissimilarity, entropy, second moment, and correlation), associated with seven different window sizes (5x5, 7x7, 9x9, 11x11, 15x15, 19x19, and 25x25), and five TM bands (TM 2, 3, 4, 5, and 7) were analyzed.... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Texture; Aboveground biomass; TM image; Correlation; Amazon. |
Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672005000200015 |
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THOMAS, E.; JANSEN, M.; CHIRIBOGA-ARROYO, F.; WADT, L. H. de O.; CORVERA-GOMRINGER, R.; ATKINSON, R. J.; BONSER, S. P.; VELASQUEZ-RAMIREZ, M. G.; LADD, B.. |
Ecosystem services of Amazonian forests are disproportionally produced by a limited set of hyperdominant tree species. Yet the spatial variation in the delivery of ecosystem services by individual hyperdominant species across their distribution ranges and corresponding environmental gradients is poorly understood. Here, we use the concept of habitat quality to unravel the effect of environmental gradients on seed production and aboveground biomass (AGB) of the Brazil nut, one of Amazonia's largest and most long-lived hyperdominants. We find that a range of climate and soil gradients create trade-offs between density and fitness of Brazil nut trees. Density responses to environmental gradients were in line with predictions under the Janzen-Connell and... |
Tipo: Artigo de periódico |
Palavras-chave: Negative density dependence (NDD); Gradiente ambiental; Espécies hiperdominantes; Serviços ecossistêmicos; Biomassa aérea; Castanha do brasil; Sequestro de carbono; Growth differentiation balance framework; Janzen-Connell hypothesis; Environmental gradients; Hyperdominant tree species.; Bertholletia Excelsa; Produção de Sementes.; Essência Florestal; Castanha do Para; Forest trees; Ecosystem services.; Brazil nuts; Seedling production; Aboveground biomass; Carbon sequestration. |
Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1131025 |
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Registros recuperados: 34 | |
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