Heterogeneidade florístico-estrutural do componente arbóreo em um sistema de fragmentos florestais no Planalto Sul catarinense

Abstract

Este trabalho teve como proposta analisar as variações espaciais, florísticas e estruturais do componente arbóreo de um sistema de fragmentos de Floresta Ombrófila Mista no Planalto catarinense. Para isso, foram alocadas 50 parcelas de 200 m² (10 x 20 m) em quatro fragmentos, cujos indivíduos com diâmetro à altura do peito (DAP) > 5 cm foram identificados e medidos. Foi calculado o Índice de Valor de Importância e realizada a comparação florístico-estrutural entre os fragmentos, por meio de Análise de Variância Multivariada Não Paramétrica (NPMANOVA). Espécies indicadoras de cada fragmento foram determinadas por meio da Análise de Espécies Indicadoras (ISA). Foram identificadas 73 espécies, sendo a de maior valor de importância Araucaria angustifolia (Bert.) Kuntze. Houve diferença na estrutura do componente arbóreo dos fragmentos (p = 0,001), sendo possível identificar espécies indicadoras para os fragmentos 1, 2 e 3. Este estudo demonstrou que fragmentos próximos entre si podem apresentar variações florístico-estruturais, que devem ser consideradas na definição de estratégias de manejo e conservação florestal.

Influence of environmental variables on the floristics and structure of natural regeneration in a Mixed Ombrophilous Forest remnant

“…However, natural vegetation has been replaced by areas with alternative land uses, such as urbanization and agricultural and silviculture activities. Therefore, these forests have become one of the most threatened forest types in Brazil (Negrini et al 2014). In the state of Santa Catarina accelerated exploitation has transformed large areas of native vegetation into sparse and greatly altered remnants, leaving only 34% of the original coverage (Vibrans et al 2021).…”

“…Because of the great environmental and social importance of the MOF, the conservation and restoration of its remnants are essential (Higuchi et al 2012a). For that it is necessary greater knowledge regarding the influence of environmental variables on the floristic and structural patterns of these forests (Higuchi et al 2012b;Marcon et al 2014;Negrini et al 2014). Such studies are important because they provide information on the microsites of occurrence of tree species, which can facilitate the indication of species for restoration (Higuchi et al 2012b).…”

Dynamics of Tree Population Structure After Disturbance of Araucaria Forest Remnants

“…The accelerated fragmentation of tropical forests is one of the greatest threats to biodiversity today (Oliveira-Filho et al 2007). Like most of the forests in the Atlantic domain, the Mixed Ombrophilous Forest has been intensely disturbed and fragmented (Higuchi et al 2012) due to a process of land occupation that has resulted in a mosaic of vegetation remnants with different sizes, shapes, and stages of degradation (Negrini et al 2014). In addition, natural events such as gales are becoming more and more frequent, which can alter the structure of forest remnants, especially where forests are more fragmented.…”

Spatial Analysis of Forest Fragmentation in the Atlantic Forest Bioma Areas

“…Thus, it is necessary to carry out studies related to the spatial characterization of forest fragments in order to establish conservation strategies (Pirovani et al, 2014). In this context, the ecology of the landscape is inserted, since the search for ecological knowledge about the forest fragments of a given area allows applying a correct environmental management as to these forests management (Calegari, Martins, Gleriani, Silva, & Busato, 2010;Negrini et al, 2014). In landscape ecology, the main object to be measured is the landscape structure, which provides characteristics of the constituent elements of the landscape, being commonly expressed through landscape metrics (Skokanová & Eremiášová, 2013).…”