Krigagem indicadora de atributos físicos do solo na bacia do Alto Taquari

Abstract

The Araguaia River comprises one of the main hydrographic basins of the Midwest, the Araguaia-Tocantins Hydrographic Basin, but even being among the most beautiful environmental patrimonies in Brazil and being visited frequently by tourists, the river has been threatened by anthropic actions. Due to these problems, the methodology of Geostatistics was used to map and to point out regions more favorable to the occurrence of environmental degradation in the headwaters of the Araguaia River, in the region more like Alto Taquari. Samples were evaluated for the respective soil physical attributes: Dispersed Clay in Water, Clay, Silt, Thick Sand, Fine Sand, Total Sand, Saturated Hydraulic Conductivity and Degree of Flocculation. Among the different techniques that involve Geostatistics, modeling was used through the concept of an indicator variable that has the advantage of little contamination by outliers. Thus, when analyzing the physical attributes of the soil, it is concluded that the regions to the left of the kriging maps are more favorable to water and wind erosion due to the high probability of occurrence of values above the median for the Dispersed Clay in Water, Clay and Silt, being contrary to the lower right region of the map, whose soil is more conducive to the sandy feature.