micronutrient modeling for mimosa scabrella bentham in the curitiba metropolitan region, parana state, brazil modelagem de micronutrientes para mimosa scabrella na região metropolitana de curitiba, estado do paraná

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ID: 183337
2010
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Abstract
The objective of this research was to model the micronutrient content for Mimosa scabrella Bentham<br />above-ground biomass, aiming to obtain equations to estimate micronutrient content using tree dimensions as<br />independent variables. Data came from 25 trees sampled in native Mimosa scabrella stands in the northern<br />Curitiba metropolitan region, Parana state, Brazil. The trees were cut down and their components were separated<br />in: leaves, branches < 4 cm, branches ≥ 4 cm, stem wood and stem bark. From a sample of each component it<br />was obtained dry matter and micronutrients contents. After fitting and testing several mathematical models, it<br />was verified that the micronutrient content equations did not present acceptable performance, except for copper<br />in all tree components and iron in tree bole components and above-ground biomass. In some cases, using bole<br />and crown dimensions, age and dominant height as independent variables improved the micronutrient content<br />equations. Better results could be found if the sampled population presented homogeneous characteristics, like<br />unique site or age class.
<p>O objetivo desta pesquisa foi modelar o conteúdo de micronutrientes da biomassa aérea de bracatinga (Mimosa scabrella Bentham). Ao todo, 25 árvores foram amostradas em diversos bracatingais da Região Metropolitana de Curitiba, no Estado do Paraná. As árvores foram derrubadas e seccionadas nos seguintes compartimentos: folhas, galhos < 4 cm, galhos ≥ 4 cm, madeira e casca do fuste, para determinação da massa seca e dos micronutrientes. Vários modelos matemáticos foram testados, além do procedimento stepwise. Os resultados indicaram que as equações para estimar o conteúdo de micronutrientes não apresentaram desempenho satisfatório, exceto para cobre em todos os compartimentos da biomassa e para ferro nos compartimentos da biomassa do fuste e para toda biomassa aérea. Em alguns casos, a inserção de dimensões da copa e do fuste, da idade e da altura dominante como variáveis independentes nos modelos melhorou o desempenho das equações desenvolvidas. Acredita-se que melhores resultados poderiam ter sido encontrados se a população amostrada apresentasse características mais homogêneas, como somente uma classe de sítio ou idade.</p><p> </p><p>Doi: 10.4336/2009.pfb.59.15</p>
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Authors ;Saulo Jorge Téo;Sebastião do Amaral Machado;Afonso Figueiredo Filho;Carlos Bruno Reissmann
Journal journal of ict research and applications
Year 2010
DOI
10.4336/2012.pfb.59.15
URL
http://www.cnpf.embrapa.br/pfb/index.php/pfb/article/view/12
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