Inventário do uso da terra na microbacia do Córrego Capivari - Botucatu, SP, no período de 35 anos.

Abstract

The vegetative cover has great influence in the run off processes, because it acts in the regime of the waters, in the characteristics of the soil, in the declines and in the mechanism hydrologic, delaying and deviating the superficial run off and, consequently, the erosion. The present work was developed with the objective of inventorying the land use in Capivari stream watershed - Botucatu (SP), during thirty-five years, in digital satellite image, bands 3, 4 and 5 of Sensor TM, of Landsat 5, of the orbit 220, point 76, quadrant A, passage of 8/06/97 and vertical aerial photographs of 1962, in scale 1:25000. The study area is placed among the geographical coordinates 22º 51' 42" to 22º 56' 16" of latitude S and of 48º 19' 04" to 48º 23' 15" of longitude W Gr., presenting an area of 3135,22ha. The results allowed that the watershed, presented a significant increment in the area of agricultural use and forest in detriment of the reduction, mainly, of the pastures and brushwoods areas. The watershed comes being preserved in environmental terms, because it comes covered with more than 1/3 with forest covering of the type forest, brushwood and reforestation, minimum demanded by law is of 20%. The high index of the land use for stands with pasture, brushwood and forest reflect the predominance of sandy soils with low fertility, as well as the presence of more than 60% with agricultural use and pasture, they show the regional predominance of the agriculture.