Qualidade físico-hídrica de um argissolo vermelho-amarelo sob agroecossistema e floresta natural em Roraima

Abstract

In the Amazon, the conversion of native forests into pastures and other production systems have led to modifications of soil physical and hydraulic depending on the type of use and management systems. The evaluation of these changes through physical attributes becomes essential to measure the physical quality of soils, being useful for monitoring changes in the environment. Thus, this study aimed to evaluate the physic chemical properties of fluid Acrisol nature forest ecosystems under different land use systems. The study was conducted on the farm Umirizal, state of Roraima, where the management systems were: Nature Forest (FN), fallow pasture (PP), a system of minimum tillage (CM), area deforested and abandoned (DA) system conventional tillage (PC). In the field, mini-trenches were opened and samples of disturbed and undisturbed soils at depths of 0-10, 10-20 and 20-40 cm, which were used to perform the following characteristics: particle size, bulk density and particle porosity, soil moisture, penetration resistance, flocculation, retention curve of soil water, and aggregate stability. The influence of the form of land use on physico-water was verified using the general linear model (GLM) and tested by the F test The results revealed that the physico- water had the following sequence, in accordance with the submitted management system and intensification of land use (PP> FN> DA> CM> PC). The resistance to penetration, porosity, water holding capacity and aggregate stability were the variables that most reflected changes in land use in relation to nature forest.