Microbial activity and soil organic carbon in agroecosystems under different managements in the semiarid region of Paraíba
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.008.0035Keywords:
Carbon from microbial biomass, Glomalin, Glomerospores, Basal soil respiration, Metabolic quotientAbstract
Smallholder agroecosystems in the Brazilian semiarid are highly vulnerable to climate change and regional water deficits, which makes it necessary for smallholder farmers to choose adaptive strategies, including sustainable management practices. We aimed to evaluate the impacts of management practices in agroecosystems through microbiological indicators of soil quality. The evaluated systems were Caatinga under pasture (CP), monoculture of forage palm (SM) and silviagriculture (SA) in agroecosystems in the municipalities of Queimadas and Boqueirão, semiarid region of Paraíba. Soil samples were collected at 0-20 cm and quantified for the microbial biomass carbon (MBC), basal soil respiration (BSR), metabolic quotient (qCO2), arbuscular mycorrhizal fungi (AMF) spores, glomalin-related soil protein (GRSP) in easily extractable (GRSP-EE) and total (GRSP-T) fractions, and total organic carbon (TOC). The SA in Boqueirão (10 years) increased the MBC, which was also more efficient through the lower qCO2 rate, while the highest amount of AMF spores was found in SA (5 years) in Queimadas. The systems with forage palm cultivation (SM and SA) were responsible for the highest concentrations of glomalin, improving favorable conditions for nutrient adsorption and soil aggregation. The highest levels of COT occurs in the SA of both agroecosystems, indicating greater stabilization and carbon sequestration in these systems. The microbiological attributes used were efficient indicators of changes in the soil due management practices.
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