Mudança na composição de espécies na região do corredor da Beira

Abstract

This work carried out in the region of the Beira Corridor (CB), aimed to evaluate changes in species composition in areas with different coverage along this area. This corridor is located in central Mozambique, partially comprising the provinces of Sofala and Manica., with a length of about 260 km. The districts covered are Dondo and Nhamantanda, in Sofala province and Gondola and Manica, in Manica province. The location and characteristics, provide a rapid change in forest cover, with deforestation rates between 2 to 5% per year being recorded, up to the year 2004. This work hypothesizes that changes in forest cover are accompanied by other ecological processes such as the change in species diversity and composition. To achieve the objective, two plot blocks were established in opposite directions, having the road (CB) as a reference, in each of the four districts of CB, and in each of the blocks, three sampling plots of 50x50 m were established. each.

The results showed that using species richness as a checker of changes in species composition between areas with high, medium and low cover, there are differences in species richness between the three covers by the Jaccard coefficient (CCj), conclude that there is similarity between areas with high and low coverage, and greater similarity was found between high and medium coverage. From the visual comparison of the arboreal status numbers of the species, it was found that the high, medium and low cover had the same species composition in terms of arboreal status. The comparison between the three covers regarding species diversity, the Shannon index, indicated that there are no significant differences, by the Student t test (P<0.05) between the three covers (TRADUÇÃO NOSSA)