Regeneração natural em povoamentos de Araucaria angustifolia e Pinus sp. em Tunas do Paraná, PR

Abstract

Com o propósito de estudar a regeneração natural em povoamentos de Araucaria angustifolia (PA) e Pinus sp.(PP), sem manejo, nas áreas do Parque Estadual de Campinhos, no Município de Tunas do Paraná, PR, foram instaladas 18 parcelas de 10 m2, 7 para PA e 11 para PP. Amostraram-se todos os indivíduos maiores que 1,5 m de altura, dos quais se mensurou o perímetro à 1,30 m do nível do solo. No PA obteve-se 586 indivíduos, 67 espécies e 29 famílias e no PP foram mensurados 442 indivíduos de 58 espécies e 22 famílias. As espécies mais importantes no PA foram Cordyline spectabilis, Lonchocarpus muehlbergianus e Clethra scabra, e no PP C. spectabilis, Lonchocarpus sp1. e Cupania vernalis. O PA apresentou parâmetros fitossociológicos e diversidade superiores ao PP. A composição florística foi similar em ambos, o que denotou o potencial regenerativo do PP.Natural regeneration under reforestation of Araucaria angustifolia and Pinus sp. in Tunas do Paraná, PR, BrazilThis study aimed to assess the natural regeneration in stands of Araucaria angustifolia (PA) and Pinus sp. (PP) without management in Campinhos State Park, in the Municipality of Tunas do Paraná, Parana State, Brazil. Eighteen plots of 10 m2 were installed, 7 plots for PA and 11 for PP. All trees higher than 1.5 m were sampled and their circumference were measured at 1.30 m above ground level. In PA stand there were 586 individuals, corresponding to 67 species and 29 families and in PP stand 442 individuals of 58 species and 22 families were measured. The most important species in PA were Cordyline spectabilis, Lonchocarpus muehlbergianus and Clethra scabra; and in PP were C. spectabilis, Lonchocarpus sp.1 and Cupania vernalis. PA showed phytosociological parameters and diversity higher than PP. The floristic composition was similar for both stands, which denoted the regenerative potential of PP.Index terms: Native species; Forest plantation; Conservation unit

INFLUENCE OF ACICULAS DEPOSITION ON NATURAL REGENERATION IN SUB-WOODS OF Pinus taeda L. FOREST STAND

“…genus in the subwood of Pinus sp. was observed by other authors when evaluating the regeneration of woody species in the presence of a layer of aciculas (CARVALHO et al, 2016;LOPES et al, 2016;VENZKE et al, 2012), corroborating the findings in this study.…”

“…Diversity values observed by other authors for the natural regeneration in forest stands of Pinus sp. (CARVALHO et al, 2016;LOPES et al, 2016;SENBETA et al, 2002) are higher than those observed in this study, because they only consider the arboreal-shrubby regeneration and are mainly performed in forest stands in advanced ages and poorly managed.…”

“…Senbeta et al (2002) when evaluating the regeneration in a forest stand of P. patula at 10 years of age in Ethiopia found 12 regenerative arboreal species. Carvalho et al (2016) when evaluating the arboreal regeneration in a forest stand of Pinus sp. at 30 years of age verified the presence of 58 species, in the Atlantic Forest Biome (Mixed Ombrophilous Forest).…”

Estádio inicial da regeneração natural de espécies arbóreas em área alterada no Estado do Amazonas

“…grande capacidade de resistir à ambientes inóspitos e competir por água e nutrientes, comprometem a sobrevivência e o crescimento inicial de espécies florestais menos tolerantes, em especial aquelas dos estádios mais avançados da sucessão (Klippel et al, 2015). Assim, o sucesso do método de regeneração natural não depende apenas da presença de fontes de propágulos no entorno da área, sendo a eliminação do fator de competição fundamental para a continuidade da regeneração natural de espécies florestais (Lamb et al, 2005;Shono et al, 2007, Chazdon, 2012, Carvalho et al, 2016.…”

Controlled-release Fertilizer in Cordyline spectabilis Seedlings Production, a Potential Species of the Asparagaceae Family

“…Cordyline spectabilis Kunth & Bouché (Asparagaceae) is known as uvarana, a native arborescent species present in primary and secondary formations of Floresta Estacional and Floresta Ombrófila Mista of Southern Brazil. It is also an important species in studies concerning regeneration, conservation, floristics, and structure of forest communities (Carvalho et al, 2016;Higuchi et al, 2016;Oliva, et al, 2018). As a climax species, Cordyline spectabilis is exigent of light, occurring in old clearings and in forests with initial canopy closure (Carvalho et al, 2016), which can contribute to forest restoration, recovery of degraded areas and enrichment of legal reserves.…”