Luciene Nunes Barcelos Martins
Abstract:
Biochemical attributes participate in key processes of the terrestrial ecosystem such as the degradation and cycling of organic matter and energy flow through various trophic levels. These indicators can be used to monitor anthropogenic interference as they are very sensitive to change, especially in sensitive ecosystems such as that presented in Plinthosol Haplico. In these soils occur the murundus fields that are elevations formed by the actions of termite that vary in diameter and height, in relation to the flooded grassy field. They are of great importance for the conservation of the watersheds of the region, however these areas were subjected to anthropic action and with the construction of drains they became arable areas, therefore the aim of this study was to evaluate the impact of agriculture on a chronosequence of an agricultural use PLANTOSOL by soil biochemical indicators such as microbial biomass (C, N), soil microbial respiration, enzymatic activity (urease, phosphatase and fluorescein diacetate hydrolysis) and metabolic quotient. The study consisted of 4 areas of murundus fields being 3 areas that are under no-tillage and one area of murundus fields without anthropization. The results were subjected to analysis of variance and means using Tukey Test at 5% significance (SAEG). As a complementary analysis, the multivariate technique was used through canonical analysis involving all biochemical variables. From the results it can be observed that in some variables there were improvements in soil quality. However, even after 16 years of conservation system there was no recovery, when compared to the reference (Coval), in the nitrogen variables in microbial biomass, organic carbon, acid phosphatase and urease. The adoption of no-tillage with succession soybean (crop) and corn (safrinha) for this soil should be changed and consider the possibility of entry of other crops and especially some for the purpose of introducing nitrogen via legumes.
