SOIL RECUPERATION IN FOREST SETTLEMENTS IN MINING AREAS IN THE TREMEMBE MUNICIPALITY - SP / RECUPERAÃÃO DO SOLO EM POVOAMENTOS FLORESTAIS EM ÃREA DE EXPLORAÃÃO DE AREIA NO MUNICÃPIO DE TREMEMBÃ-SP

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The recuperation of degraded areas due to mining activity namely sand mining is carried out by the forest recomposition with native species. In the present work the availability of nutrients along with amount of living matter cover accumulated in a native ciliary wood and in five fragments of forest recomposition of areas previously used for sand mining in the municipality of Tremembe âSP. Such areas are currently at different phases of vegetative development process, ranging from 1, 5 and 11 years. The content of nutrient, organic matter, soil acidity and total production of living matter cover and coarse living matter â leaves ,twigs and roots â were analyzed .The living matter cover was sampled in 1 m2 fragments the 0-20 and 20-40 cm layers at five different random points in the beds and between the beds in all areas. The soil samples were analyzed in terms of the attributes pH, organic matter, P, K, Ca , Mg , H , Al , base aggregation , cation exchange capacity and base saturation percentage. The comparison of the living matter cover production and the chemical attributes between the areas were analyzed by means of variance analysis complemented by the Tukey test. A smaller production of total living matter cover was observed in the fragments over 6, 5 reforestation years. As from that period however, the relation between the content of the organic matter and the amount of living matter cover in the superficial layer of the soil tends to differ. There is an increase in the nature of organic matter and the reduction of the production of living matter cover possibly due to the cumulative effect of the organic matter in the soil through the organic composts that are more resistant to decomposition and respond for the humus formation. By means of the analyses of the chemical attributes the soils of the forest fragments were classified as dystrophic and moderately fertile. The nature and level of nutrients presented average values for Ca and Mg, high for P and low for K. The higher values for Ca, Mg and P may be a result of the residual effect of the fertilization carried out during the planting process.

ASSUNTO(S)

extraÃÃo de areia forest settlements sand mining living matter cover recuperaÃÃo do solo serapilheira reforestation Ãreas degradadas povoamentos florestais degraded areas solos florestais soil recuperation reflorestamento

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