Resposta de indicadores biológicos edáficos de caatinga impactadas pela exploração de madeira.

Abstract

Wood exploration in the semiarid region of Paraíba is a degradative process that modifies soil quality. For this purpose, it was aimed to evaluate the response of biological indicators of soil quality in areas subjected to wood exploration in semiarid Paraiba. Were evaluated in three management situations: deforested area (AD), an area deforested and burned (ADQ) and native vegetation remaining (MN). These were selected representing a subarea of 70 x 50 m in which five plots of 20 x 15 m (pseudo repetitions). Soil samples (0-15 cm) in each plot was carried out in two seasons (dry and rainy season). We analyzed attributes biological indicators of soil quality, organic matter, light organic matter in water, edaphic respiration, C and N microbial biomass, C and N stocks, metabolic quotient (qCO2), microbial quotient (qMIC) and total number of spores of mycorrhizal fungi. We also conducted a multivariate analysis of principal components. In deforested areas in the Caatinga semiarid Paraiba, seasonality affected soil,biological attributes in especially organic matter, light organic matter in water, C-biomass, qCO2, qMIC and soil carbon stock. Soils biological attributes of three areas studied, especially edaphic respiration and N biomass were little affected by seasonality. There were significant effects of deforestation and wood removal on the biological attributes studied. Deforested area and burned most biological attributes was similar to reference area and distinct from deforested area.