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Population structure of Araucaria angustifolia under distinct forest protection status:implications for management and conservation

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Journal of Forestry Research 2023年第5期34卷 1437-1446页

作者： Vinicius Costa Cysneiros allan libanio pelissari Sylvio Pellico Netto Sebastiao do Amaral Machado Afonso Figueiredo Filho Departamento de Agricultura Biodiversidade e FlorestasUniversidade Federal de Santa Catarina-UFSCRodovia Ulysses GaboardiKm 03CuritibanosSC 89520-000Brazil Departamento de Ciencias Florestais Universidade Federal do Paraná-UFPRAv.Prof.Lothario Meissner632CuritibaPR 80210-170Brazil Departamento de Engenharia Florestal Universidade Estadual do Centro-Oeste-UNICENTROPR-153Km 7IratiPR 84500-000Brazil

Araucaria angustifolia is the dominant coniferous species in Brazil,a long-lived pioneer species and a supplier of valuable timber and non-timber products,which gives it key-species *** study examines how *** population structure affects the stand structure,and whether these relationships differ between protected and unprotected *** study was carried out on two protection status forests(national forest and urban forest)in a region of Atlantic mixed forest in ParanáState,southern *** coefficient and the Weibull shape parameter described the population structure and its effects on species diversity and biomass *** diameter distribution differed significantly between forests,with unbalanced structure in both,although regeneration was more abundant in the protected *** positively affected aboveground biomass whereas shape negatively affected it and species *** relationships differed between protected and unprotected *** effect of *** populations on stand structure was conditioned on protection ***-growth populations may have lower diversity and biomass stock even supporting large ***,old-growth forests,can lead to wood loss through mortality,senescence,and declining populations,representing the waste of a valuable timber *** findings provide useful knowledge for forest management,species conservation,and the carbon market.

关键词： Key species Diameter distribution Weibull shape parameter Aboveground biomass

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Probabilistic Distributions for <i>Acacia Mearnsii</i>De Wild Total Height and the Influence of Environmental Factors

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Journal of Applied Mathematics and Physics 2014年第3期2卷 1-10页

作者： Carlos Roberto Sanquetta Alexandre Behling allan Libano pelissari Ana Paula Dalla Corte Sylvio Péllico Netto Augusto Arlindo Simon Department of Forest Science University Federal of Paraná Curitiba Brazil

This paper discusses the hypothesis of height distribution on a forest stand of Acacia mearnsii De Wild, known as black wattle. It remains constant at varied growing environments and, in addition, they are not influenced by age factor. The Wakeby equation was applied. The research was carried out in a black wattle stand at varied age levels and over two different agroecological regions where plantations are found: Serra do Sudeste and Encosta do Sudeste, Rio Grande do Sul State, Brazil. It was observed that as the age rises there is an increase in the stand total height;while the number of trees decreases for the lower classes, it increases for the upper ones. This resulted in lengthening of the curve tail to the left and mode shift to the right, generating negative asymmetrical curves. Two types of height distribution were found: the sharp increase of probability in a specific class and some similar probabilities in successive classes. The distribution curves between the cultivation areas were statistically different and therefore the height distribution was dependent of environment.

关键词： Wakeby Distribution Forest Stand Age Cultivation Area Forest Structure

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