INFLUENCE OF LAND USE AND OCCUPATION IN THE QUALITY OF SURFACE WATER IN THE PARAGUAI / DIAMANTINO BASIN, MATO GROSSO, BRAZIL

Abstract

This study aims to evaluate the influence of land use and occupation at diferente scales on the quality of surface water of the Paraguay/Diamantino basin, Mato Grosso State, Brazil. Statistical tests were used to verify if there is a difference between scales at each point. Land use and land occupation analysis was performed using images from the RapidEye satellite. An unsupervised classification of the images was performed, and hree classes of land use were defined: Evergreen Seasonal Forest, Cerrado and Anthropic Uses. Using ArcGIS software, the scales were defined using the multibuffer tool with radius of 50, 500 and 1000 meters in the vicinity of each sample point. The sample collections were of the simple type, on surface in 9 points of the main tributaries of the basin. ANOVA indicated a significant difference of turbidity in the rain and drought periods, which did not occur with the Total Solids. The analysis indicated a negative correlation between total Solids and the Evergreen Seasonal Forest class. They also showed a similarity in relation to Total Solids and Turbidity, being influenced by the spatial distance between the points