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Search Results: 1 - 10 of 184591 matches for " Souza Agostinho Lopes de "
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Estratifica??o vertical em floresta ombrófila densa de terra firme n?o explorada, Amaz?nia Oriental
Souza, Deoclides Ricardo de;Souza, Agostinho Lopes de;
Revista árvore , 2004, DOI: 10.1590/S0100-67622004000500008
Abstract: this study was carried out at the forest management unit (fmu) in tracajás farm (02o35'53" s and 47o47'10"w), owned by nova era agroflorestal, in paragominas, pará, brazil. the objective was to accomplish the vertical stratification of an unexplored terra firme dense ombrophylous forest using cluster and discriminant analysis. the forest was stratified in homogeneous areas, denominated classes of volumetric stock i, ii and iii. in each class, five 100 x 100 m plots were randomly set up, where the total heights of the individual trees (dbh > 15.0 cm) were used for vertical forest stratification. the trees were organized in increasing order of total height and classified in 1 m amplitude classes, from the minimum to the maximum total height. a total height xmatrix was elaborated, with each variable xij representing the total height of the i-th tree classified into j-th class of total height. this x-matrix was the input for the cluster and discriminant analysis. the application of cluster analysis resulted into hierarchical and sequential clusters of height classes into total height strata (inferior, medium, and superior). discriminant analysis demonstrated a 100% correct classification. the vertical structure subdivision of forest into total height strata, by multivariate statistics proved the method efficient for uneven-aged forest vertical stratification.
Emprego do método BDq de sele??o após a explora??o florestal em Floresta Ombrófila Densa de Terra Firme, Amaz?nia oriental
Souza, Deoclides Ricardo de;Souza, Agostinho Lopes de;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000400014
Abstract: the objectives of this study were to analyze the diameter structure of a terra firme dense rain forest after selective logging, to apply the bdq method in the silvicultural treatment activities and to manage the forest aiming at a balanced diameter structure. the research was carried out at the forest management unit (fmu) in tracajás farm (02o35'53" s and 47o47'10"w), owned by nova era agroflorestal, in paragominas, pará, brazil. the forest was stratified into homogeneous areas, called classes of volume stock i, ii, and iii. in each of the stock classes, five plots of 100 x 100 m (1 ha) were randomly set up for measurement of the individuals with dbh > 15cm. in the center of each 100 x 100 m plot, a subplot of 10 x 100 m (0,1 ha) was established for measurement of the individuals with 5cm < dbh < 15 cm. the bdq selection method was used taking into account the remaining basal area (b), maximum diameter (d) and the de liocourt constant (q). in the stock class i, the proposed management method allowed the removal of 56.4 trees/ha, 3.33 m2/ha and 67.64 m3/ha, with a 13.1% reduction of the basal area. in the stock class ii, 53.7 trees/ha, 3.88 m2/ha and 65.96 m3/ha were removed, with a 16.2 % reduction of the basal area. in the stock class iii, 63.3 trees/ha, 3.13 m2/ha and 46.76 m3/ha were removed, with a 14.0% reduction of the basal area. few trees or a deficit was observed in the higher diameter classes due to the selective logging. the periodical removal of trees should occur in the lower diameter classes, aiming at a balanced diameter distribution and the conduction of the forest to a balanced structure during the cutting cycle, leading to a continuous use of the forest woody products.
Análise multivariada para estratifica??o volumétrica de uma floresta ombrófila densa de terra firme, Amaz?nia Oriental
Souza, Agostinho Lopes de;Souza, Deoclides Ricardo de;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000100007
Abstract: the objective of this study was to propose a method for stratification of an unexplored terra firme dense ombrophylous forest into classes of volumetric stocks, by using the techniques of cluster and discriminant analysis. the research was carried out at the forest management unit (fmu) in tracajás farm (02o 35'53" s and 47o 47'10"w), owned by nova era agroflorestal, in paragominas, pará, brazil. an census (100%) was accomplished in which the volumes of commercial whole-tree with dbh > 45 cm were estimated for 55 commercial species in 49 stands 10 ha each. the estimated volumes of individual commercial whole-trees were organized in a increasing order. a x-matrix was built, in which each variable xij represented the i-th volume classified in the j-th stand. this x-matrix was the input for the cluster and discriminant analysis. the application of the cluster analysis resulted in hierarchical clusters of the stands in stock classes. the analysis of the dendrogram allowed the stratification of the forest in three homogeneous and distinct groups, denominated classes of volumetric stock i, ii and iii. the discriminant analysis pointed out that 100% of the stands were correctly classified. the multivariate classification of the forest into homogeneous classes of volumetric stocks showed to be an efficient method for stratification of uneven-aged forests, which can be constituted by extracts, compartments, site classes and annual production units.
Análise multivariada para estratifica o volumétrica de uma floresta ombrófila densa de terra firme, Amaz nia Oriental
Souza Agostinho Lopes de,Souza Deoclides Ricardo de
Revista árvore , 2006,
Abstract: O objetivo deste estudo foi propor um método de estratifica o em classes homogêneas de estoque volumétrico da floresta ombrófila densa de terra firme n o explorada, empregando-se as técnicas de análises de agrupamento e discriminante. A pesquisa foi conduzida na Unidade de Manejo Florestal (UMF) da Fazenda Tracajás (02o35'53"S e 47o47'10"W), pertencente à empresa Nova Era Agroflorestal, de propriedade do Grupo Rosa Madeireira, Município de Paragominas, Estado do Pará. Foi realizado um censo (100%), no qual se estimaram os volumes do fuste comercial das árvores com dap > 45 cm de 55 espécies comerciais em 49 talh es de explora o com 10 ha cada um. Reuniram-se os volumes estimados do fuste comercial das árvores individuais por talh o em ordem crescente. Elaborou-se uma matriz X de dados desses volumes, em que cada variável x ij representou o i-ésimo volume classificado no j-ésimo talh o. A matriz X foi utilizada como input nas análises de agrupamento e discriminante. A aplica o da análise de agrupamento, método de Ward, resultou em agrupamentos hierárquicos dos talh es em classes de estoques. A análise do dendrograma permitiu estratificar o povoamento em três grupos homogêneos e distintos, denominados classes I, II e III de estoques volumétricos. A análise discriminante, método de Fisher, indicou que 100% dos talh es foram corretamente classificados. A classifica o multivariada da floresta em classes de estoques volumétricos mostrou-se um método eficiente na estratifica o de áreas homogêneas de florestas ineqüianeas, as quais podem se constituir em estratos, compartimentos, classes de sítio e unidades de produ o anual.
Altera??o florística de áreas de florestas exploradas convencionalmente em planos de manejo, nos domínios de floresta atlantica, Minas Gerais-Brasil
Coelho, Danilo José da Silva;Souza, Agostinho Lopes de;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000200007
Abstract: the objective of the present study was to analyze the changes in the composition of species, in forest management areas having as control the legal reserve area, and it was carried out in fragments of semideciduous seasonal forests in the zona da mata region of minas gerais state. following the harvest of each fmp, the comparison between forest management areas and legal reserve areas showed that, in relation to changes in diversity of the fmp tree species, the verifiers ecological group, use group and rare species group indicated that the forest management areas of all the fmps were statistically equal (p>0.05) to the legal reserve areas. the verifier species richness indicated that the forest management areas and the legal reserve areas of the fmp28 and fmp29 were statistically equal (p>0.05), whereas the fmp30 and fmp16 were statistically different (p<0.05). the verifier species diversity indicated that the forest management areas were statistically different (p>0.05) from the legal reserve areas in fmp29, fmp30 and fmp16 and statistically equal (p<0.05) in the fmp28. the greatest similarity of species occurred between the groups formed by the fmp29amf and fmp29arl, and the smallest similarity occurred between the groups formed by fmp29arl, fmp29amf, fmp28arl, and fmp16arl, fmp16amf, fmp30arl, fmp30amf, fmp28amf.
Ciclo de corte econ?mico ótimo em floresta ombrófila densa de terra firme sob manelo florestal sustentável, Amaz?nia Oriental
Souza, Deoclides Ricardo de;Souza, Agostinho Lopes de;Silva, Márcio Lopes da;Rodrigues, Flávio Lopes;
Revista árvore , 2004, DOI: 10.1590/S0100-67622004000500007
Abstract: the objective of the present study was to estimate the optimum cutting cycle and harvest stock, where forest annual growing rate equals the annual interest rate offered by the financial market. the research was carried out at the forest management unit (fmu) in tracajás farm (02o35'53" s and 47o47'10"w), owned by nova era agroflorestal, in paragominas, pará, brazil. the forest was stratified in three homogeneous areas denominated classes of volumetric stock i, ii and iii, through multivariate analysis (cluster and discriminant analysis). in each of the stock classes, five 100 x 100 m plots (1 ha) were randomly set up to measure individuals with dbh > 15cm. in the center of each 100 x 100 m plot, a 10 x 100 m subplot (0,1 ha) was installed to measure individuals with 5cm < dbh < 15 cm. in stock class i, the optimum economic cycles were 13, 12, and 8 years; in stock class ii, 18, 12 and 12 years; in stock class iii, 22, 12 and 14 years, considering an average annual increment of 3,0 m3/ha/year. higher remuneration rates for the invested capital were verified for the shorter cutting cycles, regardless of the commercial harvest. higher annual volume increments resulted in a higher valorization of the forest. higher harvested volumes implicated in longer cutting cycles for a same forest growing rate. however, within certain limits, higher harvested volumes can biologically result in higher growing rates of the remaining stock. this occurs mostly when silvicultural treatments are applied.
Emprego de análise multivariada para estratifica??o vertical de florestas ineqüianeas
Souza, Deoclides Ricardo de;Souza, Agostinho Lopes de;Gama, Jo?o Ricardo Vasconcellos;Leite, Helio Garcia;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000100008
Abstract: this study was carried out in order to propose a method for vertical stratification of trees in a heterogeneous natural forest stand with the use of multivariate analysis. total height data were obtained from 10 permanent sample plots (each with 20 m x 50 m) (re)measured in june, 2000. plots were established in 1994, in vi?osa (20o 45' s and 42o 55' w), minas gerais, brazil. total height data for individual trees were ranked and classified in one meter height classes. an x data matrix was organized with the total height information: each element xij represents an individual observation on the ith tree located in the jth total height classes. this x matrix was the input for both the cluster and discriminant analysis. the euclidean distance and the complete linkage method were used. cluster analysis produced a hierarchy of distinct sequential clusters of total height, namely: low, average and high strata. discriminant analysis has proven that the classification was correct. distribution of trees among all three strata were as follows: low 1.068 (71.63%); average, 324 (21.73%); and high, 99 (6.64%) individuals. anadenanthera macrocarpa, apuleia leiocarpa, pseudopiptadenia contorta and piptadenia gonoacantha presented the largest absolute density (da) per unit area and regular distribution in the three strata. the stratification method used in this study has proven to be an operationally viable technique for structural analysis of natural forest stands as well as for planning and implementation of sustainable forest management.
Estrutura diamétrica dos estratos e grupos ecológicos de uma área de Floresta Estacional Semidecidual,em Dionísio, MG
Souza, Priscila Bezerra de;Souza, Agostinho Lopes de;Meira Neto, Jo?o Augusto Alves;
Revista árvore , 2012, DOI: 10.1590/S0100-67622012000100016
Abstract: the objective of this study was to obtain homogeneous groups of species and information on their density, dominance and volume, in terms of ecological group and diameter structure of an area of submontane semideciduous forest (mata do mumba?a) in dionísio, mg. this work was conducted with data of the diameter distribution per species from floristic and phytosociological (mata do mumba?a) survey of 120 plots with 10 x 10 m each one. the 120 plots were contiguous and corresponding to a total sample area of 12,000 m2 distributed over the topographic units (low ramp, lower slope, upper slope and hill top). the topographic units low ramp, lower slope and upper slope were in the middle stage of succession as they presented incipient stratification into two strata (canopy and understory) i.e. canopy ranging from 5 to 12 m high. however, the stratum hill top was classified as intermediate/advanced succession because it had a total height equal to or greater than 12 m. the distribution of individual trees of the four strata on diameter classes showed a typical j-inverted pattern that is, high concentration of individuals in smaller diameter classes and a sharp reduction towards the larger classes. in relation to absolute dominance and total volume of species, the ecological group that stood out in the four strata (low ramp, lower slope, upper slope and hill top) was the initial secondary, which were in the intermediate stage of secondary, rapidly developing into the mature phase.
Análise estrutural em floresta ombrófila densa de terra firme n?o explorada, Amaz?nia Oriental
Souza, Deoclides Ricardo de;Souza, Agostinho Lopes de;Leite, Helio Garcia;Yared, Jorge Alberto Gazel;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000100010
Abstract: the objective of this study was to analyze the floristic composition and the horizontal, internal and diametric structure of an unexplored terra firme dense ombrophylous forest. the research was carried out at the forest management unit (fmu) in tracajás farm (02o35'53" s and 47o47'10"w), owned by nova era agroflorestal, in paragominas, pará, brazil. the forest was stratified in three homogeneous areas denominated classes of volumetric stock i, ii and iii, through multivariate analysis (cluster and discriminant analysis). in each of the stock classes, five plots of 100 x 100 m (1 ha) were randomly set up for the measurement of individuals with dbh > 15cm. in the center of each 100 x 100 m plot, a subplot of 10 x 100 m (0.1 ha) was installed for the measurement of individuals with 5cm < dbh < 15 cm. in classes i, ii and iii of trees with dbh > 15cm (level i inclusion), the total density was estimated at 322.4; 309.0 and 313.8 individuals per hectare, respectively. the total dominance was of 27.36; 27.45 and 25.88 m2/ha and the total volume of commercial whole-tree were of 358.69; 328.33 and 408.69 m3/ha. in classes i, ii and iii of individuals with 5 cm < dbh < 15 cm (level ii inclusion), the total density was estimated at 846; 854 and 886 individuals per hectare, respectively. the total dominance was of 4.80; 4.93 and of 5.46 m2/ha and the total volume of commercial whole-tree were of 93.98; 91.23 and 97.61 m3/ha. the species of highest relative importance value, lecythis idatimon (potential), rinorea guianensis (non-commercial) and pouteria guianensis (potential) occurred in all inclusion levels and all three stock classes. the diametric distribution of all species and of the commercial species with dbh > 5 cm estimated by the meyer equation confirmed the negative exponential trend ("inverted j"). the analysis of the forest structure in stock classes allowed the evaluation of the species composition and the forests phytosociologic structure, being useful for the el
Composi??o florística da vegeta??o arbórea de um remanescente de cerra??o, paraopeba, MG
Souza, Priscila Bezerra de;Alves, Jo?o Augusto;Silva, Alexandre Francisco da;Souza, Agostinho Lopes de;
Revista árvore , 2008, DOI: 10.1590/S0100-67622008000400020
Abstract: this work was carried out at the floresta nacional de paraopeba - flona, in the municipality of paraopeba, minas gerais state, brazil, located at 19o16'19"s and 44o24'06"w, to study the floristic composition of the tree stratum of a forest formation (cerrad?o), and to evaluate the similarity with other floristic surveys conducted in cerrad?es of minas gerais and s?o paulo. there have been found 78 species belonging to 66 genera representing 31 families. the most representative families in relation to number of species were fabaceae-leguminosae (22), myrtaceae (10) and vochysiaceae (3). floristically the cerrad?es is closer to the forest formations than to cerrado and formally they could be classified as a subtype of those forest formations, because 83% of the species are accessory and just 17% peculiar.
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