Soil microbial community, enzyme activity, C and N stocks and soil aggregation as affected by land use and soil depth in a tropical climate region of Brazil

Autor(es)

Sarto, Marcos V. M. ^{[1, 2]} ; Borges, Wander L. B. ^[3] ; Bassegio, Doglas ^[4] ; Pires, Carlos A. B. ^[1] ; Rice, Charles W. ^[1] ; Rosolem, Ciro A. ^[5]

Afiliação do(s) autor(es)

^[1] Kansas State Univ, Dept Agron, Manhattan, KS 66506 - USA

^[2] 1712 Claflin Rd, Manhattan, KS 66502 - USA

^[3] Agron Inst IAC, Adv Res Ctr Rubber Tree & Agroforestry Syst, Votuporanga, SP - Brazil

^[4] Western Parana State Univ, UNIOESTE, BR-85819130 Cascavel, PR - Brazil

^[5] Sao Paulo State Univ, UNESP, Av Univ 3780, BR-18610034 Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Archives of Microbiology; v. 202, n. 10 AUG 2020.
• Citações Web of Science: 1

Resumo

The impact of agricultural land-use on soil microbial community composition and enzyme activity has not been extensively investigated in Ultisols. We investigated soil health parameters by analyzing phospholipid fatty acids (PLFAs), extracellular enzyme activity, C and N stocks, and soil structure. Four land uses were established in a tropical climate region of Brazil: native Cerrado(savanna), monoculture pasture {[}Urochloa brizantha (Hochst. Ex A. Rich.) R. Webster `Marandu'], an integrated crop-livestock system (ICLS), and maize (Zea mays)-fallow in a no-tillage system. Soil microbial biomass was 40% higher in the native Cerrado than in the monoculture pasture, ICLS, and no-tillage maize. Soil organic carbon was positively correlated with microbial community composition (MB; gram-; AC; AMF; Fungi; F: B ratio) and enzyme activity (bG, AP, NAG). Large macroaggregates were positively correlated with bG, AP, and AMF. In summary, the native Cerrado had a higher level of carbon at the soil surface and greater soil structure with increased microbial biomass, gram+ bacteria, AMF, fungi, and F:B ratio in a tropical region of Brazil. However, bG and AP enzyme activities were lower in the ICLS and no-till maize at the soil surface (0-5 cm) compared to the native Cerrado. The conversion of native Cerrado to agricultural systems shifted the soil microbial community composition, enzyme activity, C and N, and soil structure of this sandy soil of the Brazilian Cerrado. (AU)

• Processo FAPESP: 14/10656-3 - Contribuição do eucalipto para a matéria orgânica do solo em sistema integrado
• Beneficiário: Marcos Vinicius Mansano Sarto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/14323-4 - Atividade microbiana em integração eucalipto e Urochloa
• Beneficiário: Marcos Vinicius Mansano Sarto
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado