Alometria e arquitetura de <i>Copaifera langsdorffii</i> (Desf.) Kuntze (Fabaceae) em fitofisionomias neotropicais no sul de minas gerais

Abstract

RESUMOO objetivo deste trabalho foi analisar padrões alométricos e feições arquiteturais de Copaifera langsdorffii em diferentes fisionomias de uma região de tensão ecológica. As fisionomias de floresta, corredor, cerrado e cerrado rupestre foram estudadas nos municípios de Lavras e Carrancas, sul de Minas Gerais, Brasil. Foram estudadas as relações entre diâmetro do tronco, altura, área da copa, grau de deflexão e deslocamento relativo da copa, sendo analisado o grau de semelhança, entre as fisionomias, por meio de regressões e análise covariância. Foi realizada uma análise de componentes principais (PCA) com variáveis biométricas coletadas e morfométricas calculadas, para caracterização de grupos mais homogêneos que evidenciem a plasticidade morfológica da espécie e suas diferentes estratégias e investimento em recursos. Como resultado das análises de regressão e covariância, encontraram-se padrões distintos, principalmente entre as fisionomias de floresta e cerrado, das fisionomias de cerrado rupestre e corredor. Um padrão de crescimento com maior investimento em altura na floresta, objetivando a garantia de espaço no dossel, e outro mais ligado ao crescimento horizontal da copa, nas fisionomias de cerrado rupestre e corredor. A PCA apresentou um gradiente de plasticidade morfológica para a espécie. A fisionomia de floresta apresentou maiores valores de altura total, largura de copa e diâmetro do tronco, e a fisionomia de cerrado rupestre mostrou valores mais elevados de grau de deflexão da copa (assimetria). O cerrado e o corredor formaram uma transição entre floresta e cerrado rupestre, no gradiente de feições morfológicas da espécie nas fisionomias. Palavras-chave: morfologia de árvores; plasticidade fenotípica; fitogeografia; copaíba. ABSTRACTThis study examined allometric patterns and architectural features of Copaifera langsdorffii, in different physiognomies in a region of ecological tension. The forest, corridor, 'cerrado', and rocky cerrado physiognomies were studied in the districts of Lavras and Carrancas, south of Minas Gerais state, Brazil. The relationships between stem diameter, height, crown area, degrees of deflection and relative displacement were analyzed, as well as the degree of similarity between the physiognomies by means of regressions and covariance analysis. The principal component analysis (PCA) was performed with the collected biometric and calculated morphometric variables to characterize the most homogeneous groups which show the

Modelling of Allometric Equations for Biomass Estimate in Deciduous Forest

“…In conditions in which all plants with DBH ≥ 5 cm were considered, such as in the present study, errors are usually high (Table 1), mainly due to the variability of the tree architecture, as observed by Hálle (2010) and Costa et al (2012). However, other aspects were identified, such as the occurrence of broken canopies and the presence of hollow boles or boles attacked by fungi that reduce the basic specific mass (weight) of the bole wood.…”

<i>Trema micrantha <?I>(L.) Blume. IN PLANTATIONS FOR ECOLOGICAL RESTORATION: EARLY DEVELOPMENT IN THE BRAZILIAN SUBTROPICAL FOREST

“…According to Thorpe et al (2010), competition for canopy space is a fundamental structuring feature of forest ecosystems, and the result of this competition determines the size of the canopy of each tree, which reflects in interception of light, photosynthetic capacity, growth and even survival. Costa et al (2012) observed that increasing the density of tree vegetation contributed to increase competition of the canopy for light. Siqueira (2006), verified that competition of the crown by light favors the development of the higher branches in detriment of the lower ones.…”

“…Siqueira (2006), verified that competition of the crown by light favors the development of the higher branches in detriment of the lower ones. On the other hand, Costa et al (2012) observed that the decrease of the density of the tree vegetation facilitated the penetration of light, making possible the existence of lower live branches. Costa and Finger (2016), found that in a natural subtropical forest, the decrease of the competition favors the increase of the crown length of Araucaria angustifolia.…”

Relações morfométricas para <em>Copaifera langsdorffii</em> (Desf.) Kuntze na região norte de Minas Gerais, Brasil

“…With great ecological plasticity, the species can occurs naturally in entire Brazilian territory, as in region of Minas Gerais state, Cerrado, Caatinga, Atlantic Forest, Riparian Forest formations and associated ecosystems (CARVALHO et al, 2009;MELO JUNIOR, CECCANTINI and BONA, 2011;COSTA et al, 2012b;NUNES et al, 2015;CARVALHO et al, 2018). According Orellana and Koehler (2008), although wood is the main economic resource derived from forests, some species have great importance for alternative products supply, as in the case of oil-resin, with wide range of medical applications (PIERI, MUSSI and MOREIRA, 2009;MUSSI et al, 2009;HECK, VIANA and VICENTINI,2012).…”