Crown Efficiency and Pine Cones Production for Brazilian Pine (Araucaria angustifolia (Bertol.) Kuntze) in South Brazil

Hess, André Felipe and Atanazio, Kemely Alves and Borsoi, Geedre Adriano and Schorr, Luis Paulo Baldissera and Souza, Isadora de Arruda and Costa, Emanuel Arnoni and Klein, Danieli Regina and Krefta, Sandra Mara and Stepka, Thiago Floriani and Abatti, Roberta and Ricken, Polliny and Rosa, Gabriel Teixeira da (2019) Crown Efficiency and Pine Cones Production for Brazilian Pine (Araucaria angustifolia (Bertol.) Kuntze) in South Brazil. Journal of Agricultural Science, 11 (6). p. 247. ISSN 1916-9752

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Abstract

Crown efficiency is a relation of growth with the area tree occupies (available area efficiency). Efficiency is associated with the vertical and lateral expansion capacity of the tree and crown, increase, density and light absorption. Thus, our study aimed to evaluate crown efficiency with pine cones∙tree-1 production and dendro/morphometric variables of individual araucaria trees in three forest sites in south Brazil. In each site of each tree, dendrometric and morphometric variables were measured and increment rolls were taken at the breast height diameter level. Together with these data, the morphometric indexes, annual periodic increment in diameter of the last ten years (APId) and efficiency of the crown as a function of APId by the horizontal projection area of the crown (hpac) and number of pine cones∙tree-1 (np) by hpac were calculated. Crown efficiency was modeled as a function of the independent variables hpac, APId, crown length (cl), crown ratio (cr) and np. The accuracy of the adjustment was evaluated by the statistics of the deviance, Akaike’s information criterion and graph of the residuals. The results show that the number of pine cones∙tree-1 increases with annual periodic increment in diameter and diameter. Crown efficiency decreases with increasing hpac, cl and cr, indicating silvicultural treatments should be performed with the removal of trees of larger diameter and crown size. A higher pine cones production and efficiency correlates with forest growth, shape, competition, sociological position (stratum tree occupies) and density.

Item Type: Article
Subjects: Souths Book > Agricultural and Food Science
Depositing User: Unnamed user with email support@southsbook.com
Date Deposited: 11 May 2023 08:42
Last Modified: 07 Jun 2024 11:04
URI: http://research.europeanlibrarypress.com/id/eprint/863

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