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Biomass equations for Brazilian semiarid caatinga plants Acta Botanica
Sampaio,Everardo V.S.B.; Silva,Grécia C..
Allometric equations to estimate total aboveground alive biomass (B) or crown projection area (C) of ten caatinga species based on plant height (H) and/or stem diameter at ground level (DGL) or at breast height (DBH) were developed. Thirty plants of each species, covering the common range of stem diameters (3 to 50 cm), were measured (C, H, DGL, DBH), cut at the base, separated into parts, weighted and subsampled to determine dry biomass. Wood density (p) of the stem and the largest branches was determined. B, C, H and p ranged from 1 to 500 kg, 0.2 to 112 m², 1.3 to 11.8 m, and 0.45 to 1.03 g cm-3. Biomass of all 10 species, separately or together (excluding one cactus species), could be estimated with high coefficients of determination (R²) using the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stem diameter; Height; Crown area; Wood density.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062005000400028
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Growth of seven perennial plant species adapted to the Brazilian Semi-Arid Acta Botanica
Silva,Paulo Sérgio Lima e; Silva,Kathia Maria Barbosa e; Lôbo,Raimundo Nonato Braga; Silva,Paulo Igor Barbosa e.
Measuring plant height (y) and canopy diameter (x) in trees may not be an easy task, but stem diameter (z) can be more easily evaluated. This work's objective was two-fold: evaluate the growth of species adapted to the Brazilian Semi-Arid Region in the first two years of age, and obtain linear equations to estimate y and x from z, in those species. A random block design with four replications was employed. The values for x, z, and y were measured biannually from October/2003 to March/2005. Prosopis juliflora and Mimosa caesalpiniaefolia showed the highest stem diameter and plant height values, respectively, and both showed the highest canopy diameter. In the equations to estimate plant height from the stem diameter the value of the coefficient of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Caatinga; Canopy diameter; Plant height; Regression analysis; Stem diameter.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000400018
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Sample size and sampling method for evaluation of characteristics of the sunflower1 Rev. Ciênc. Agron.
Silva,Paulo Sérgio Lima e; Santos,Luiz Eduardo Barreto dos; Oliveira,Vianney Reinado de; Sousa,Roberto Pequeno de; Fernandes,Patrícia Lianny de Oliveira.
In the sunflower, in addition to seed yield, it is of interest to evaluate number of leaves plant-1, head diameter, stem diameter and plant height, since these characteristics may be associated with seed yield or lodging. The objective of the work was to determine the optimal sample size (from which the experimental coefficient of variation, CV, can be established) for evaluation of these four characteristics. Fifteen cultivars were evaluated in an experimental design of randomized blocks with ten replications. The characteristics were evaluated using two sampling methods (in a single row of plants or in the two rows from the useable area of each plot) and sample sizes of from two to 18 sampling units, with an interval of two plants. In the two sampling...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Helianthus annuus L.; Plant height; Leaf number; Stem diameter; Head diameter.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100144
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