Velocidade de infiltração da água num plintossolo háplico de campo de murundu sob uma cronossequência de interferência antrópica

Abstract

This study was conducted in an area located in the watershed of the municipality of Rio Claro Jataí - GO. The climate according to the classification of the type is Koepen Cw, mesothermal, with defined dry and rainy seasons. The average annual temperature varies from 18 to 32oC, with higher frequency around 25oC, verifying in the lower temperatures up to 26oC, reaching up to 22oC in the higher parts. The rainy season extends from November to May, in which are recorded more than 80% of the total rainfall of the year. The peak occurring in December and January (average over 300 mm in the period), the largest decline since March and lowest rainfall in July and August. The average annual rainfall varies between 1600 and 1700 mm (with gradual spatial variation, without the presence of nuclei rainy very different in the study area). The phenomenon of "Indian summer" occurs in the rainy season, usually in the months January to March and usually last about 10-15. The area has been subject to different management, different times of deployment of agriculture, and were selected within the field of mound four areas, of which three are under anthropogenic interference chronosequence. In addition to these areas, one with no human intervention was also evaluated, taking samples from the top of the hillock and their respective bases. In each area, six plots were demarcated, considered replications of 100 m2 in each plot where tests were performed in soil water infiltration. The methodology used to determine the infiltration rate was the cylinder infiltrometer. The study aimed to determine the velocity curves of water infiltration, and respective values of basic infiltration rate for the areas of soils under study. In areas without anthropogenic interference values were obtained from basic infiltration rate of 242 and 170 mm.h-1 for low and high parts of the hillock, respectively, and values of a 2 mm.h-1 to areas with anthropogenic interference, a checking process of soil compaction in areas with the implementation of agriculture.