| 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]
Número total de Autores: 6
|
| 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
Número total de Afiliações: 5
|
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) |