Caracterização morfométrica de árvores solitárias de Bertholletia excelsa H.B.K. no sudeste de Roraima

Dionísio, Luiz Fernandes Silva; Condé, Tiago Monteiro; Gomes, Jefferson Peixoto; Martins, Walmer Bruno Rocha; Silva, Manoela Torres da; Silva, Marcos Wanderley da

doi:10.18227/1982-8470ragro.v11i2.3835

Cited by 9 publications

(16 citation statements)

References 15 publications

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“…In average values of AGB of the analyzed area, it was found values similar to those of Silva et al 2017, who used the same approach to predict AGB stocks in a forest in the state of Pará, although in the authors' study, no negative changes were found over a period of two years. Studies similar to the scope of this work report on impacts in forests that caused a reduction in AGB values.…”

Section: Dinâmica Da Biomassa Acima Do Solo Na Amazônia Brasileira Ussupporting

confidence: 64%

“…perform the cut of the measured plots in the field, as well as the tree individuals delineated by the segmentation process, which is explained next. From the CloudMetrics command, the LiDAR metrics derived from the plots were extracted, while the GridMetrics command was used to produce the same LiDAR metrics, as calculated with Cloud-Metrics, but now within grid cells of 50X50m spatial resolution across the landscape according to the methodology presented in Longo et al, (2016) and Silva et al, (2017).…”

Section: Dinâmica Da Biomassa Acima Do Solo Na Amazônia Brasileira Usmentioning

confidence: 99%

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Dynamics of Above-Ground Biomass in the Brazilian Amazon Using LiDAR Data

et al. 2020

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ResumoA biomassa de florestas tropicais desempenha um papel importante no ciclo global do carbono. Portanto, é importante entender melhor as variações nos estoques, dinâmica e estrutura das florestas tropicais para uma melhor compreensão do ciclo global do carbono. Nesse sentido, o objetivo deste estudo foi avaliar a dinâmica da biomassa acima do solo (BAS) em uma floresta tropical, utilizando dados LiDAR (Light Detection and Ranging) em um período de dois anos (2011)(2012)(2013). Técnicas automáticas de detecção de copas foram utilizadas de forma complementar para observar se mudanças estruturais podem influir na dinâmica da BAS. O estudo foi conduzido na Floresta Nacional do Jamari, em Rondônia. A metodologia foi composta de processamento LiDAR e classificação de objetos (Copas). Foram geradas estimativas de BAS via LiDAR para as parcelas do inventário florestal e para a amostra da área de estudo. Fortes correlações foram observadas entre as estimativas de AGB (r > 0,88). As mudanças estruturais identificadas das copas delineadas não influenciaram nos valores obtidos para a área amostral, que apresentou um padrão de redução (5,64%). Apesar das mudanças negativas ocorridas, não houve diferença significativa (p > 0,05; teste Tukey) da BAS entre o período avaliado. A tecnologia LiDAR apresenta grande potencial para detectar mudanças em ampla escala, sendo possível obter informações (BAS) precisas do ambiente. O enfoque utilizado pode contribuir para futuras análises que visem avaliar mudanças dos estoques de BAS. AbstractTropical forest biomass plays an important role in the global carbon cycle. Thus, a better understanding of variations in the stocks, dynamics and structure of tropical forests is important to understanding the global carbon cycle. In this sense, the objective of this study was to evaluate the dynamics of above-ground biomass (AGB) in a rainforest using LiDAR (Light Detection and Ranging) data over a period of two years (2011)(2012)(2013). Automatic crown detection techniques were used in a complementary way to observe whether structural changes may influence the dynamics of AGB. The study was conducted in Jamari National Forest in Rondonia. The methodology was composed of LiDAR processing and classification of objects (Crowns). Estimates of AGB were generated via LiDAR for the forest inventory plots and for the sample of the study area. Strong correlations were observed between estimates of AGB (r> 0.88). The structural changes identified in the outlined crowns did not influence the values obtained for the sample area, which presented a reduction pattern (5.64%). Despite the negative changes that occurred in this study, no significant difference (p> 0.05; Tukey test) of AGB was found among the evaluated period. The LiDAR technology has great potential for detecting large-scale changes and it is possible to obtain accurate environmental information (AGB). The approach used in the study may contribute for further analyses aimed at evaluating changes in AGB stock.

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Section: Dinâmica Da Biomassa Acima Do Solo Na Amazônia Brasileira Ussupporting

confidence: 64%

Section: Dinâmica Da Biomassa Acima Do Solo Na Amazônia Brasileira Usmentioning

confidence: 99%

Dynamics of Above-Ground Biomass in the Brazilian Amazon Using LiDAR Data

et al. 2020

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“…In addition, Dionisio et al (2017) pointed out that this index can be used as an indicator of the extent of thinning, and the need (or not) to increase the space available to a target individual so that it can grow without competition.…”

Section: Número Total De áRvores Avaliadas (N°) = 75; Coeficiente De mentioning

confidence: 99%

“…Nesse sentido, esses valores podem ser relacionados à estrutura de copa do ipê rosa, associado ao porte, com pequena projeção de copa, pouco densa e que ocupa relativamente pouco espaço no calçamento, assim, a espécie pode projetar a sua copa muito mais vezes em relação ao seu DAP. Nesse aspecto, Dionisio et al (2017) destacaram que esse índice pode ser utilizado como indicador de desbastes, aumentando o espaço disponível para o indivíduo de modo que esse cresça sem concorrência.…”

Section: De Acordo Comunclassified

Use of morphometry in the arborization of Paragominas city, Pará, Brazil, with Handroanthus impetiginosus (Mart. ex DC.) Mattos (Bignoniaceae)

Oliveira

Lima

Martins

2018

AGRO@MBIENTE ON-LINE

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The study of the morphometry of individual trees, especially those planted in urban spaces has become important for the effective planning of available space use. The objective of this study was to describe the morphometric variables for individuals of the species Handroanthus impetiginosus Mattos (pink trumpet tree, pink ipe) used for urban tree-planting in the municipality of Paragominas, Pará State, northern Brazil. The study evaluated 15 continuously distributed individual trees per street, one street per neighborhood. For each sampled tree, the dendrometric data were collected, which were later converted to morphometric variables. Mean values for Total Height (TH), Canopy Width (CW), Diameter at Breast Height (DBH) and Canopy Diameter (CD) were 6.48, 3.98, 0.19 and 4.95, respectively. Canopy Ratio (CR), Slenderness Factor (SF) and Salience Index (SI) values of 61.95, 35.16 and 26.44 were calculated. Mean Coverage Index (CI) was 0.78, and Canopy Form (CF) was considered to be more elongated, both vertically and horizontally and, with a mean value of 1.35, could be used as a criterion to determine the need for silvicultural intervention. Coefficient of Variation (CV) values lay between 20 and 43%, showing high variation due to the lack of experimental control and the action a wide-variety of growth-influencing variables. There was a moderate positive correlation for the SG and SI (0.522) and for CI and HR (0.631). The morphometric variables obtained from H. impetiginosus individuals reveal growth form data that should be considered when planning new urban areas for implantation.

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“…The search for sustainable production systems has been a key component of development strategies for the Amazon region (LEÃO et al, 2017). However, to manage native forest species successfully, it is necessary to understand the ecological characteristics and dynamics of the species over time so as to know which will be best suited for commercial plantations, reforestation projects or use in the recovery of degraded areas (DIONISIO et al, 2017a;DIONISIO et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Production and decomposition of litter in different mahogany (Swietenia macrophylla King) cropping systems

Correia¹,

Martins²,

Oliveira³

et al. 2018

RCM

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The objective of this work was to evaluate the litter production and decomposition in three mahogany (Swietenia macrophylla King) systems in the northeastern Pará region. The treatments were: T1-mahogany consortium with forest species; T2-homogeneous plantation of mahogany; and T3-secondary forest enriched with mahogany. Collectors of 1 m 2 opening were used to collect the litter produced monthly for a year. Evaluations were performed monthly for one year. The decomposed litter was estimated by means of the relation between the litter produced and the litter accumulated in the soil. The litter deposition dynamics did not present a significant correlation with variations in rainfall and average temperature. The homogeneous mahogany plantation produced more litter (5.6 Mg ha-1 year-1) with the leaf fraction being the most representative. The decomposition and renewal of litter did not differ between the three mahogany environments. The pure Brazilian mahogany plantation produced a larger amount of litter compared to the other planting systems, with the leaf fraction presenting the highest percentage contribution.

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Caracterização morfométrica de árvores solitárias de Bertholletia excelsa H.B.K. no sudeste de Roraima

Cited by 9 publications

References 15 publications

Dynamics of Above-Ground Biomass in the Brazilian Amazon Using LiDAR Data

Dynamics of Above-Ground Biomass in the Brazilian Amazon Using LiDAR Data

Use of morphometry in the arborization of Paragominas city, Pará, Brazil, with Handroanthus impetiginosus (Mart. ex DC.) Mattos (Bignoniaceae)

Production and decomposition of litter in different mahogany (Swietenia macrophylla King) cropping systems

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