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Registros recuperados: 6
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Aboveground biomass in Prosopis pallida (Humb. and Bonpl. ex Willd.) H. B. K. ecosystems using Landsat 7 ETM+ images RChHN
PADRÓN,EVA; NAVARRO-CERRILLO,RAFAEL M.
The significance of field work in remote sensing studies when applied to large areas has often been underestimated. The combination of specific forest inventories for the estimation of aboveground biomass in large dry tropical forest areas with remote sensor data has scarcely been explored to date. In this work, a systematic, stratified forest inventory involving 100 X 100 m square plots in an area of Peruvian Prosopis pallida dry forest, roughly one million hectares in size in the Piura province (Peru) has been compiled. The inventory encompassed the principal silvicultural variables defining the ecosystem studied, which were used in allometric equations for the different species, genera and plant associations in the area in order to estimate the amount...
Tipo: Journal article Palavras-chave: Prosopis pallida; Landsat 7 ETM+; Vegetation indices; Biomass estimation.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000100004
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Airborne lidar-based estimates of tropical forest structure in complex terrain: opportunities and trade-offs for REDD+. Repositório Alice
LEITOLD, V.; KELLER, M.; MORTON, D. C.; COOK, B. D.; SHIMABUKURO, Y. E..
Carbon stocks and fluxes in tropical forests remain large sources of uncertainty in the global carbon budget. Airborne lidar remote sensing is a powerful tool for estimating aboveground biomass, provided that lidar measurements penetrate dense forest vegetation to generate accurate estimates of surface topography and canopy heights. Tropical forest areas with complex topography present a challenge for lidar remote sensing.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Tropical montane forest; Airbone lidar; Digital terrain model; Elevation accuracy; Data thinning; Canopy height; Biomass estimation; REDD+.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1019401
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Close relationship between diameters at 30cm height and at breast height (DBH) Acta Amazonica
Gehring,Christoph; Park,Soojin; Denich,Manfred.
This paper proposes the establishment of a second diameter measuring standard at 30cm shoot extension ('diam30') as input variable for allometric biomass estimation of small and mid-sized plant shoots. This diameter standard is better suited than the diameter at breast height (DBH, i.e. diameter at 1.30m shoot extension) for adequate characterization of plant dimensions in low bushy vegetation or in primary forest undergrowth. The relationships between both diameter standards are established based on a dataset of 8645 tree, liana and palm shoots in secondary and primary forests of central Amazonia (ranging from 1-150mm dbh). Dbh can be predicted from the diam(30) with high precision, the error introduced by diameter transformation is only 2-3% for trees...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allometry; Measuring standard; Amazonia; Biomass estimation; Thin shoots.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672008000100008
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Indirect and expedite assessment of Ilex paraguariensis commercial yield. Repositório Alice
WENDLING, I.; STURION, J. A.; REIS, C. F.; STUEPP, C. A.; PEÑA PEÑA, M. L..
A produção de biomassa comercial é uns dos principais indicadores para seleção de progênies e clones de erva-mate. Técnicas tradicionais para se obter tais informações dependem da colheita das árvores e apresentam, dentre outras limitações, elevado custo e reduzida praticidade. Assim, objetivou-se avaliar a eficiência de métodos indiretos, por meio de estimativa de biomassa comercial e escore de produtividade em função de diferentes procedências, sexo e morfotipos. Em um teste de progênies e procedências instalado em 1997, foram avaliadas em agosto de 2015 (dois anos após a última colheita) duas metodologias de análise visual. Para tanto, participaram cinco avaliadores treinados que determinaram, para cada planta, uma estimativa de biomassa comercial (kg),...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Erva mate; Estimativa de biomassa; Estimativa visual; Morfotipos; Biomass estimation; Visual estimate; Morphotype; Mate; Espécie nativa; Produtividade; Ilex paraguariensis.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1054561
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The influence of the environment on the variability of monthly tuna biomass around a moored, fish-aggregating device ArchiMer
Doray, Mathieu; Petitgas, Pierre; Nelson, Laetitia; Mahevas, Stephanie; Josse, E; Reynal, Lionel.
Fish-aggregating devices (FADs) are increasingly used worldwide to enhance tuna catches. Meanwhile, ecosystem-based management of this fishery is constrained by a paucity of information regarding the interaction of FAD-associated tuna aggregations with their local environment. This paper reports the results of a nine-month study around a FAD moored near Martinique Island, aimed at assessing the effects of the local environment on the variability of monthly estimates of proximate tuna biomass. Dual-frequency, active acoustics provided highresolution quantitative data on the pelagic community around the FAD, from fish to micronekton forage. Geostatistics were used to compute biomass estimates of the tuna aggregation comprising most of the FADassociated fish...
Tipo: Text Palavras-chave: Lesser Antilles; Tuna; Environment; Geostatistics; Biomass estimation; Fish aggregating device.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2008/publication-6162.pdf
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Vascular epiphyte biomass in a South Brazilian fragment of Atlantic Forest Anais da ABC (AABC)
PETEAN,MARISE P.; MARCON,AMANDA K.; LIEBSCH,DIETER; GALVÃO,FRANKLIN; KERSTEN,RODRIGO A..
Abstract The present study aimed at sampling the biomass of vascular epiphytes within a protected area in South Brazilian Atlantic Forest. All tree specimens with diameter at breast height equal or greater than 4.8 cm were measured and divided into classes. In each class, 10% of tree specimens were randomly selected for epiphytic biomass measuring. Furthermore, we divided the phorophytes into five tree parts to analyze epiphytic biomass. We generated mathematical models to estimate epiphytic biomass in similar forest areas. We analyzed 55 phorophytes and found an estimated epiphytic biomass of 5.3 Mg/ha. Epiphytic biomass ranged from 0.02 to 135 kg and the lower values were found on small-sized phorophytes. Higher values of epiphytic biomass were found on...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass estimation; Carbon storage; Crown humus; Dead organic matter; Epiphytes; Epiphytic biomass.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703717
Registros recuperados: 6
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