Análise da composição florística e fitossociológica da floresta nacional do Tapajós com o apoio geográfico de imagens de satélites

Espírito-Santo, Fernando Del Bon; Shimabukuro, Yosio Edemir; Aragão, Luiz Eduardo Oliveira e Cruz de; Machado, Evandro Luiz Mendonça

doi:10.1590/s0044-59672005000200006

Cited by 66 publications

(31 citation statements)

References 14 publications

(8 reference statements)

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“…The predominance of individuals in the more clayey part in study area corroborates with the studies of Fernandes and Alencar (1993), Muller (1995) and Espirito-Santo et al (2005). The results of these authors indicated that this species presents better production in soils with clayey to very clayey texture and soils of sandy texture are unsuitable to maximize the growth potential of this species.…”

Section: Relation Of the Variables With The Brazil Nut Treessupporting

confidence: 88%

“…The region's climate, according to the classification of Köppen, is of the Type Ami (IBAMA, 2004). Through the common precipitation of the period from 1950 to 2000 of the station of Belterra-PA, Espirito-Santo et al (2005) identified the presence of a rainy seasonal period (January -June) and other less rainy (JulyDecember) well defined.…”

Section: Study Areamentioning

confidence: 99%

“…There are found Dystrophic Yellow Latosol, Argissolos Red-Yellow, Petric Plinthosols dealers and Entisol. The classes Argissolos RedYellow and Dystrophic Yellow Latosol occupy respectively, 37.1 and 25.34% of the FLONA (Espirito-Santo et al, 2005).…”

Section: Study Areamentioning

confidence: 99%

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Spatial variability of soil physical and chemical aspects in a Brazil nut tree stand in the Brazilian Amazon

Guerreiro¹,

JÃonior²,

Santos³

et al. 2017

Afr. J. Agric. Res.

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The Brazil nut is considered one of the noblest trees of the Amazon biome and contains social, ecologic and economic importance to this region. The study of the spatial variance of the edaphic properties in native nut trees can direct future researches about more efficient samplings. The Geostatistics is the methodology utilized for this type of study, once that it considers the structural and random characteristics of a variable spatially distributed. This work sought to get a higher knowledge about the distribution of the nutrients in the soil, verifying the relationship with the occurrence of this species, to thereby provide subsidies to future forest management and maintenance/enlargement of the productivity in these areas. The soil samples were collected from 30 × 30 m on the line, in all of the lines in part of the study, totaling 60 samples. All of the points were georeferenced. The preparation of the samples for the sample preparation for the chemical analysis and the methods and calculations to determine the physicochemical variables studied were described by Nogueira and Souza (2005). The statistical and geostatistical analysis were conducted using the R computational environment, version 3.2.2. Most of the studied variables presented defined level. For the physical variables, there was predominance of the adjustment to the model of the gaussian variogram, follower by the spherical model. In the case of the chemical variables, there were two occurrences for each adjustment model (spherical, exponential and gaussian). The variables that best presented spatial relation with the occurrence of Brazil nut trees were the silt, clay, macroporosity, pH, phosphorus, zinc and copper.

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Section: Relation Of the Variables With The Brazil Nut Treessupporting

confidence: 88%

Section: Study Areamentioning

confidence: 99%

See 1 more Smart Citation

Spatial variability of soil physical and chemical aspects in a Brazil nut tree stand in the Brazilian Amazon

Guerreiro¹,

JÃonior²,

Santos³

et al. 2017

Afr. J. Agric. Res.

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“…According to Radambrasil (1976) and Espírito-Santo et al (2005), the FLONA Tapajós was subdivided into 16 classes divided in two great phytophysiognomy groups: Dense Tropical Forest, and Open Tropical Forest. The first has a subcategory lowland dense tropical forest, which occurs in lowland areas with clay soil and has as dominant species: Diplotropis species, Minquartia guianensis, B. excelsa, and Goupia glabra.…”

Section: Study Areamentioning

confidence: 99%

Litter production in a natural stand of Brazil nut trees (Bertholletia excelsa Bonpl.)

Guerreiro¹,

JÃonior²,

Ruivo³

et al. 2018

Afr. J. Agric. Res.

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This research estimated litter production and analyzed its relation to environmental variables such as maximum temperature, insolation, and rainfall. The study was conducted on a 300 × 300 m experiment as part of the project titled mapping of native Brazil nut stands and socio-environmental and economic characterization of Brazil nut production systems (MapCast), in the Tapajós National Forest (FLONA Tapajós). Every 30 days for one full year (August 2015 to July 2016), litterfall was collected and stored in a laboratory. After drying, the material was separated into leaves, wood, flowers and fruits, and miscellaneous and weighed. Statistical tests conducted were Shapiro-Wilk (5%), Principal coordinate analysis, t-test, Pearson's linear correlation, cross-correlation, and canonical redundancy analysis. Rainfall and temperature data were inferior and superior, respectively, to normal climate conditions in the region, and data for solar insolation had an abnormal pattern compared to normal climate conditions. Leaf production varied between 169.9 and 965.6 kg ha . The greatest leaf production was measured during the months with the lowest amount of rainfall and highest temperatures, and variation in leaf production and total litterfall was partially explained by temperature and insolation.

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“…It comprises approximately 600,000 hectares of lowland native forest which has been submitted to controlled timber extraction and sustainable forest management studies (Silva et al 1985, Kanashiro et al 2002. The climate, according to Köppen classification, is AmW, characterized by annual dry period of 2-3 months and average rainfall of 2,000 mm (600 mm to 3,000 mm) (Espírito-Santo et al 2005). The average annual air temperature is 25 °C, mean relative humidity is 86% (Carvalho et al 2004).…”

Section: Methodsmentioning

confidence: 99%

Pollination biology in Jacaranda copaia (Aubl.) D. Don. (Bignoniaceae) at the "Floresta Nacional do Tapajós", Central Amazon, Brazil

Maués¹,

Oliveira²,

Kanashiro³

2008

Rev. bras. Bot.

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-(Pollination biology in Jacaranda copaia (Aubl.) D. Don (Bignoniaceae) at the "Floresta Nacional do Tapajós", Central Amazon, Brazil). Jacaranda copaia (Aubl.) D. Don is a pioneer tree widespread in the Brazilian Amazon, usually found colonizing forest gaps and altered areas, and the forest fragment edges. This study investigated aspects of the floral biology, breeding system and pollinators of J. copaia trees. Flowering lasts from August to November, during the low rainfall period extending up to four weeks per tree and 3-4 months for the population as a whole, characterizing a cornucopia flowering pattern. The fruit set ends in the beginning of the rainy season, with wind dispersed winged seeds.Fruit set from open pollination was 1.06% (n = 6,932). Hand pollination using self-pollen (n = 2,099) did not set fruits. Cross-pollination resulted in 6.54% fruit set (n = 2,524), representing six times more than the natural pollination rate (1.06%, n = 6,932). Flowers excluded from insect visitation (automatic self-pollination) did not set fruits (n = 5,372). Pollen tube growth down to ovary was detected under fluorescence microcoscopy in cross-pollinated and selfed pistils. The species is an obligate allogamous plant, with late-acting self-incompatibility system. Approximately 40 species of native bees visited the flowers, but the main pollinators were medium-sized solitary bees as Euglossa and Centris species due to the compatibility between their body sizes with the corolla tube, direct contact with the reproductive structures and high frequency of visits.Key words -bees, floral biology, late-acting self-incompatibility (LSI), phenology, pollinators RESUMO -(Biologia da polinização de Jacaranda copaia (Aubl.) D. Don (Bignoniaceae) na Floresta Nacional do Tapajós, Amazônia Ocidental, Brasil). Jacaranda copaia (Aubl.) D. Don é uma árvore pioneira distribuída por toda Amazônia brasileira, encontrada colonizando clareiras, áreas alteradas e bordas de fragmentos florestais. O presente estudo investigou aspectos da biologia floral, sistema reprodutivo e polinizadores de J. copaia. O florescimento ocorre de agosto a novembro, durante o período de menor precipitação pluviométrica, estendendo-se por até quatro semanas por indivíduo e três ou quatro meses para a população, caracterizando um padrão de floração cornucopia. A frutificação termina no início da estação chuvosa, com a dispersão anemocórica das sementes aladas. A taxa de frutificação natural foi de 1,06% (n = 6.932). As flores autopolinizadas manualmente (n = 2.099) não produziram frutos. A polinização cruzada (n = 2.524) resultou em 6,54% frutos, representando seis vezes mais do que a polinização natural (1,06%, n = 6.932). As flores protegidas da visita de polinizadores (autopolinização espontânea) não formaram frutos (n = 5.372). O crescimento dos tubos polínicos foi detectado sob microscopia de fluorescência tanto nos pistilos autopolinizados quanto nos submetidos à polinização cruzada. A espécie foi considerada alógama obrigatória, com mecanismo de a...

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Análise da composição florística e fitossociológica da floresta nacional do Tapajós com o apoio geográfico de imagens de satélites

Cited by 66 publications

References 14 publications

Spatial variability of soil physical and chemical aspects in a Brazil nut tree stand in the Brazilian Amazon

Spatial variability of soil physical and chemical aspects in a Brazil nut tree stand in the Brazilian Amazon

Litter production in a natural stand of Brazil nut trees (Bertholletia excelsa Bonpl.)

Pollination biology in Jacaranda copaia (Aubl.) D. Don. (Bignoniaceae) at the "Floresta Nacional do Tapajós", Central Amazon, Brazil

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