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Registros recuperados: 6
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Canopy area of large trees explains aboveground biomass variations across neotropical forest landscapes. Repositório Alice
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 em periódico indexado (ALICE) 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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COMPARISON OF DRY DEPOSITION AND CANOPY EXCHANGE OF BASE CATIONS IN TEMPERATE HARDWOOD FORESTS IN FLANDERS AND CHILE Gayana Botánica
Staelens,Jeroen; Schrijver,An De; Oyarzún,Carlos; Lust,Noël.
Bulk precipitation, throughfall and stemflow of base cations Na+, K+, Mg2+ and Ca2+ were measured in two deciduous beech forests, located in regions with different air pollution characteristics and strongly differing in soil acidity and soil base saturation. The contribution of dry deposition and canopy leaching to net throughfall flux was estimated using Na+ as a tracer ion. The input of base cations via bulk precipitation was not significantly different between Nothofagus obliqua (Mirb.) Bl. in southern Chile and Fagus sylvatica L. in Flanders. However, net throughfall input of Ca2+ and Mg2+ to the forest floor was significantly higher in Chile than in Flanders. Potassium fluxes were similar in both studied stands. Dry deposition of Ca2+ was higher in...
Tipo: Journal article Palavras-chave: Atmospheric deposition; Base cations; Fagaceae; Forest canopy; Throughfall.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100003
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Diversity patterns of hawkmoths (Lepidoptera: Sphingidae) in the canopy of an ombrophilous forest in Central Amazon, Brazil Acta Amazonica
LOURIDO,Gilcélia Melo; MOTTA,Catarina da Silva; GRAÇA,Márlon Breno; RAFAEL,José Albertino.
ABSTRACT Sphingidae attracted to light were systematically collected in an Amazonian forest canopy. Sampling occurred at a height of 34 m in an upland primary rainforest plateau in the Cueiras River basin, located within the Experimental Station of Tropical Silviculture, Manaus municipality, Amazonas, Brazil. The hawkmoths were collected using a vertical white sheet illuminated by a 250 W mixed mercury light and a 20 W black-light (BLB) fluorescent tube. Monthly collections were carried out from January to December 2004, during three nights of lunar transition from third quarter moon to new moon between 6 p.m. and 6 a.m. We sampled 1748 specimens, represented by 1485 males and 263 females, belonging to 52 species and 21 genera. Xylophanes comprised the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazon rainforest; Flight activity; Forest canopy; Species composition; Species richness.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000200117
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Evaluating tropical forest classification and field sampling stratification from lidar to reduce effort and enable landscape monitoring. Repositório Alice
PAPA, D. de A.; ALMEIDA, D. R. A. de; SILVA, C. A.; FIGUEIREDO, E. O.; STARK, S. C.; VALBUENA, R.; RODRIGUEZ, L. C. E.; OLIVEIRA, M. V. N. d'.
In high biodiversity areas, such as the Amazon, forest inventory is a challenge due to large variations in vegetation structure and inaccessibility. Capturing the full gradient of variability requires the acquisition of a large number of sample plots. Pre-stratified inventory is an efficient strategy that reduces sampling effort and cost. Low-cost remote sensing techniques may significantly expand pre-stratification capacity; however, the simplest option, satellite optical imagery, cannot detect small variations in primary forests. Alternatively, three-dimensional information obtained from airborne laser scanning (ALS, a.k.a. airborne lidar) has been successfully used to estimate structural parameters in tropical forests. Our objective was to assess to...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Manejo florestal; Field forest inventory; Filed sampling; Amostragem de campo; Características de plantas; Cubierta forestal; Espacios vacíos en el dosel; Índice de área foliar; Análisis de conglomerados; Análisis estadístico; Embrapa Acre; Rio Branco (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Administração Florestal; Floresta Tropical; Inventário Florestal; Amostragem; População de Planta; Sensoriamento Remoto; Raio Laser; Estrutura Vegetal; Campo Experimental; Análise Estatística; Tropical forests; Forest management; Plant characteristics; Remote sensing; Lidar; Forest canopy; Canopy gaps; Leaf area index; Cluster analysis; Statistical analysis.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1115167
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Spider assemblage (Arachnida: Araneae) associated with canopies of Vochysia divergens (Vochysiaceae) in the northern region of the Brazilian Pantanal Rev. Bras. Zool.
Battirola,Leandro D.; Batistella,Daniel A.; Rosado-Neto,Germano H.; Brescovit,Antonio D.; Marques,Marinêz I..
ABSTRACT This study describes the composition and temporal variation of the spider assemblage (Arachnida: Araneae) associated with canopies of Vochysia divergens Pohl. (Vochysiaceae) in the northern region of the Brazilian Pantanal. Three V. divergens plants were sampled in 2004, at each seasonal period of the northern Pantanal (high water, receding water, dry season and rising water), using thermonebulization of the canopies with insecticide, totaling 396 m2 of sampled canopies. Analysis of abundance and richness of spider families were based on Non-Metric Multidimensional Scaling (NMDS) and Variance Analysis (ANOVA and MANOVA). A total of 7,193 spiders were collected (6,330 immatures; 88.0%; 863 adults, 12.0%) distributed in 30 families. Araneidae (1,676...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Invertebrates; Diversity; Forest canopy; Seasonality; Wetlands.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702016000400700
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Stingless bees and mass flowering trees in the canopy of Atlantic Forest: a tight relationship Acta Botanica
Ramalho,Mauro.
This study demonstrates that stingless bees (Apidae, Hymenoptera) amount to approximately 70% of all bees foraging on flowers in the Brazilian Tropical Atlantic Rainforest. They also are the unique bee group concentrated in the upper stratum. It is hypothesized that this vertical distribution is a result of an uneven distribution of preferred floral resources within the forest strata. In the upper stratum, most of the trees that are highly visited by stingless bees produce small, inconspicuous, generalized flowers, clustered in dense inflorescences (mass flowering). These trees represent only 15% of the total melittophilous flora in the study area (96 plant species). In contrast, they attracted all 17 stingless bee species and more than 70% of all...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stingless bees; Forest canopy; Foraging stratification; Mass flowering; Atlantic forest.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062004000100005
Registros recuperados: 6
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