Diversidade E Guildas De Regeneração De Espécies Arbóreas Na Borda De Uma Floresta Nativa Em Contato Com Plantio De Pínus

Abstract

ResumoO objetivo do presente trabalho foi verificar a influência do efeito borda sobre a diversidade e a participação de diferentes guildas de regeneração em um fragmento florestal nativo em contato com reflorestamento de pínus. Para isso, foram amostrados o estrato arbóreo adulto (DAP -diâmetro à altura do peito ≥ 5 cm) e regenerante (altura maior que 15 cm e DAP < 5 cm) em cinco transeções de 20 x 100 m perpendiculares à borda do fragmento. Cada transeção foi subdividida em cinco subparcelas de 20 x 20 m, definindo-se os setores representando o gradiente borda-interior: 0-20 m, 20-40 m, 40-60 m, 60-80 m e 80-100 m. As espécies foram classificadas em guildas de regeneração: pioneira, clímax exigente em luz e clímax tolerante a sombra. Foram determinadas a diversidade (Índice de Shannon) e a abundância das guildas em cada setor e estrato. Os dados foram analisados pelo teste t de Hutcheson e teste de proporção. Enquanto que no estrato adulto não houve variações na diversidade ao longo do gradiente borda-interior, no componente regenerativo a maior diversidade foi observada na borda (0-20 m). Apenas no estrato adulto foram observadas variações na participação relativa das guildas, com maior concentração de indivíduos de pioneiras nos primeiros 40 m. Palavras-chave: Ecologia; fragmentação de hábitats; Floresta Ombrófila Mista. Abstract Diversity and regeneration guilds of tree species in an edge of a natural forest in contact with a pinus plantation.The objective of the present study was to verify the influence of edge-effect on diversity and regeneration guilds participation in a forest fragment in contact with a Pinus plantation. For this, the adult (dbh -diameter at breast height≥5 cm) and regenerative (height higher than 15 and dbh<5 cm) components were sampled in five, 20×100 m, transects perpendiculars to the edge of a fragment. Each transect was subdivided in five, 20×20 m, subplots, defining the following sectors representing the edge-interior gradient: 0-20 m, 20-40 m, 40-60 m, 60-80 m and 80-100 m. The species were classified according to the following regeneration guilds: pioneer, light demanding climax and shade tolerant climax. The diversity (Shannon Index) and guilds abundance in each sector were determined. The data were analyzed by Hutcheson t test and proportion test. While no variation was observed for the adult component, the highest of diversity was observed in the edge (0-20 m) for the regenerative component. Variations along the edge gradient of the relative participation of guilds were observed only for adults, with a concentration of Pioneer within the first 40 m.

Natural Regeneration of Tree Species in a Cloud Forest in Santa Catarina, Brazil

“…For instance, Mauhs andBackes (2002) andDalla Rosa et al (2015) have found values of 2.90 and 3.16, respectively. The lowest value we have found has probably occurred due to the limiting environmental conditions of the high mountain formation (FRANÇA; STEHMANN, 2004), such as low temperatures and lower incidence of solar radiation, due to which such physiognomy has a low evapotranspirative capacity as well as shallow soils, therefore constituting an ecologically selective environment which has enabled the development of a small number of species and high ecological dominance. Higher dominance has also been confirmed by the low Pielou's equitability value (0.75) and the high NRI value of only 10 species (79.6%).…”

“…It is a pioneer species that invests in the production of large numbers of propagules being an excellent colonizer, but it has a low competitive capacity due to its high light-requirement (MALUF; WIZENTIER, 1998), which makes its development in the understory difficult, especially regarding this fragment where the mean value of canopy closure is 99.35% (MARCON et al, 2014). It is also worth noting the high richness of the Myrceugenia genus among the species of higher community participation and its presence in all height classes, being considered an important genus in the composition of high mountain forests (FRANÇA;STEHMANN, 2004;MEIRELES et al, 2008). According to Landrum (1981), this genus stands out along the Brazilian plateaus eastern coast at elevations above 900-1,000 m and under a cold and humid climate, which is in accordance with the features we have found.…”

Traços funcionais e <i>performance</i> de espécies arbóreas em uma Floresta Ombrófila Mista no Planalto Sul-Catarinense

“…O estudo foi realizado no Parque Natural Municipal João José Theodoro da Costa Neto -PARNAMUL, situado nas coordenadas geográficas centrais de 27°47'22" de latitude sul e 50°20'43" de longitude oeste, e com altitude média de 950 m. O parque faz divisa com rodovias, plantios de Pinus taeda L. e área urbana e rural. Possui vegetação florestal protegida e em estádio intermediário a avançado de sucessão, conforme observado por Dalla Rosa et al (2015).…”

Passive restoration in Araucaria Forest: useful ecological indicators in monitoring successional advancement in exotic tree plantation landscapes

“…The same goes for areas which need to be restored within exotic tree plantation landscapes (e.g. Zanini & Ganade 2005; Ferreira et al 2012, 2013; Schorn et al 2013; Scariot et al 2014; Dalla Rosa et al 2015; Stedille et al 2018a, 2018b). Therefore, knowing the composition and structure of the tree community together as taxonomic groups (i.e.…”