Resumo

RODRIGUEZ, María F et al. Analysis of precipitation aggressiveness and concentration in Venezuela. III. Southeastern Region (Guayana and Delta). Bioagro [online]. 2011, vol.23, n.2, pp.99-104. ISSN 1316-3361.

In order to evaluate the distribution and aggressiveness of the precipitation in the Southeast region of Venezuela (Guayana and the Orinoco Delta), we performed an analysis of monthly precipitation data from 41 meteorological stations, and the Precipitation Concentration Index (PCI) and Modified Fournier Index (MFI) were calculated. The index values were evaluated using univariate and geostatistical analysis, adjusting semivariograms to theoretical models. For mapping the spatial distribution of the indices, interpolation by punctual kriging method was carried out, generating the appropriate file, which was edited in ArcView. It was found that rainfall has a very high aggressiveness (values of MFI classified as very high). The distribution of rainfall was moderately seasonal in 91 % of the entire territory, and only in the Northwestern of Amazonas State and Central North of Bolivar State, precipitation presented a seasonal distribution. It is concluded that soils of most part of the region are greatly vulnerable to erosion by effect of rainfall.

Palavras-chave : Geostatistics; modified Fournier Index; precipitation concentration index; sustainable land management.