Avaliação da sucessão ecológica e do desenvolvimento de árvores em uma lavra de cascalho revegetada do Distrito Federal, DF - Brasil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Brazilian savanna holds the greatest floristic biodiversity of this type in the World. 41,6% of brazilian savanna vegetation was substituted by anthropic activities. One of them is mining. The recuperation process of the degraded area is slow and complex and involves revegetation activities and soil management practice. The present study was established in an exploited gravel mine, located at ARIE Santuário de Vida Silvestre do Riacho Fundo - DF. The gravel mine was revegetated in 2003, half of the exploiting area was scarified and seeded with Stylosanthes spp while the other half did not receive any type of herbaceos stratus. The Stylosanthes spp (commercially known as minerão) was chosen because it is a native species an its sawing is permited in conservation units and because herbaceous species stablished in mined areas grow fast, protect the soil and incorporate organic matter. Burrows were dug in both parts of the mine (with and without Stylosanthes spp), totalizing 72 plants af 6 species (Inga edulis, Couepia grandiflora, Genipa americana, Hymenaea stigonocarpa, Kielmeyera lathrophyton e Tapirira guianensis) in each half of the area 36 plants received mulch. In adittion 36 plants were implanted in an area of preserved savanna adjacent to the mine. The outlasting and development of the plants were annualy monitored since ssedling till 2008. The percentage of outlasting trees in the end of five years was 67,2%, and there were no Kielmeyera lathrophyton that outlasted. The plants stablished in the soil area that was not mined (control area) presented higher percentage of losses. In managements, phytosociologic index (linear coverage, relative density, relative frequency and IVI) and Shanonn index, Jaccard and Pielou were applied. One observed that the seedling of the herbaceous stratus improved the diversity of species in 63%, there was a decrease in 20% of the exotic species, and an increase of 30% in linear coverage. Due to the fact that in brazilian savanna minerão the herbaceous and arboreal stratun present heliophyt behavior the introduction of both stratun cause competition, but significance was not observed in the development of the arboreal species considered.

ASSUNTO(S)

outros recuperação de areas degradadas de cerrado mining estrato arbóreo mineração estrato herbáceo arboreal stratun herbaceous stratun recuperation of degraded area

ACESSO AO ARTIGO

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