relação entre a presença de vegetação herbácea e a regeneração natural de espécies lenhosas em pastagens abandonadas na floresta ombrófila densa do sul do brasil relationship between herbaceous vegetation and regeneration of woody species in abandoned pastures in the atlantic rain forest in southern brazil

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ID: 251319
2009
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Abstract
A conversão de áreas florestais em pastagens constitui uma das atividades que mais degradam a Floresta Ombrófila Densa. Neste estudo, avaliaram-se áreas de pastagens abandonadas há oito, 14, 48, 50 e 96 meses, em Antonina (Estado do Paraná, 25º19'15'' S e 45º24'24'' W), com o objetivo de verificar se a presença da cobertura herbácea diminui a regeneração natural das espécies arbóreas. Foram identificadas as espécies e avaliada a biomassa de espécies herbáceas (em 24 parcelas de 1 m²) e volume das espécies lenhosas (altura igual ou superior a 1 m; 24 parcelas de 25 m²). Nas cinco áreas estudadas foram amostradas 59 espécies herbáceas (1.062 indivíduos), das quais, a maioria (95%) era exótica (incluindo Brachiaria decumbens e B. humidicola). Para a comunidade de hábito arbustivo-arbóreo, foram amostradas 104 espécies (2.234 indivíduos). Houve significativa modificação florística e estrutural da vegetação nos primeiros quatro anos após o abandono das pastagens. O desenvolvimento da vegetação lenhosa foi inversamente relacionado à presença de espécies herbáceas, o que sugere que a cobertura vegetal promovida pelas ervas, principalmente B. decumbens, seja um dos fatores que influenciam negativamente a regeneração natural. Estes resultados sugerem que práticas de manejo que incluam a remoção ou redução dos efeitos de Brachiaria spp sejam necessárias na restauração de pastagens abandonadas.
Deforestation and conversion of forests to pasture is one of the most degrading activities impacting the Atlantic Rain Forest. We analyzed pastures abandoned for 8, 14, 48, 50 and 96 months in Antonina (Paraná state; 25º19'15'' S; 45º24'24'' W) to verify if herb cover reduces the natural regeneration of the Atlantic forest. We identified species and assessed shoot biomass of herbaceous species (in 24 1 m² plots), and calculated the volume of all woody species (height > 1m; in 24 25 m² plots). We collected 59 herbaceous species (1,062 individuals) most of which were allochthonous species (95%), including Brachiaria decumbens and B. humidicola. We also sampled 104 woody species (2,234 individuals). There were significant floristic and structural changes in the community during the first four years since the pasture was abandoned. Woody vegetation development was negatively related to herb species' biomass, suggesting that grasses (B. decumbens) inhibited forest regeneration. Our results suggested that management, including Brachiaria spp removal, is necessary for the restoration of abandoned pastures in the Atlantic Forest region.
Reference Key
cheung2009actarelao Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Kwok Chiu Cheung;Márcia C. M Marques;Dieter Liebsch
Journal monatshefte für chemie chemical monthly
Year 2009
DOI
10.1590/S0102-33062009000400015
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062009000400015
Keywords
ecological restoration atlantic forest alien species

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