Interações espécie-ambiente na colonização de uma voçoroca em Itumirim, Minas Gerais

CERNE

Pereira, José Aldo Alves²  Carlos, Leandro²  Marques, João José Granate de Sá e Melo²  Machado, Evandro Luiz Mendonça¹  Loschi, Ricardo Ayres² 

[1] Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina$$;Universidade Federal de Lavras, Lavras$$

关键词: Erosion;    natural regeneration;    needle method;    species-environment interactions;    multivariate analysis.;   

DOI  :  10.1590/S0104-77602011000200003

来源: Universidade Federal de Lavras-UFLA

【 摘 要 】

This work aimed to identify and evaluate the structure of regenerating species in a gully of Itumirim, MG (21º16'S and 44º50'W) and to verify the influence of edaphic factors on the distribution and occurrence of species. The gully in question covers an area of 0.9 ha and was divided into three sections, namely 'A', 'B' and 'C' arms. For the structural survey of vegetation the needle method was used, whereby 574 points systematically distributed across the three arms were sampled. Each point was stratified on the terrain as a function of a topographic gradient. In order to obtain environmental variables (physicochemical analysis, soil moisture and compaction), 119 soil collection points were defined, parallel with the transects of the structural survey. A prevalence of soils/sediments with high sand content and low fertility was observed in all three arms. Overall, species ordination in the gully through CCA showed that species in the 'grass-like' group tend to be more abundant in low, humid, relatively more fertile areas, whereas species in the 'fern' group tend to be more abundant in higher topographic positions where soil moisture is reduced and compaction increases. The vast majority of shrub and tree life forms failed to present significant correlations with the main environmental variables used in the CCA.

【 授权许可】

Unknown