Short-term effect of Eucalyptus plantations on soil microbial communities and soil-atmosphere methane and nitrous oxide exchange.

• Autor(a) principal: CUER, C. A.
• Data de Publicação: 2018
• Outros Autores: RODRIGUES, R. de A. R., BALIEIRO, F. de C., JESUS, J., SILVA, E. P., ALVES, B. J. R., RACHID, C. T. C. C.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1098098
• topic: Emissions of greenhouse gases; Soil microbial processes; Atlantic Forest

Soil greenhouse gas (GHG) emissions are a signifcant environmental problem resulting from microbially-mediated nitrogen (N) and carbon (C) cycling. This study aimed to investigate the impact of Eucalyptus plantations on the structure and function of a soil microbial community, and how resulting alterations may be linked to GHG fuxes. We sampled and monitored two adjacent Eucalyptus plantations?a recently logged site that harbored new seedlings and an adult plantation and compared them to a site hosting native vegetation. We used 16S rRNA gene sequencing and qPCR amplifcations of key nitrogen and methane cycle genes to characterize microbial structure and functional gene abundance and compared our data with soil parameters and GHG fuxes. Both microbial community attributes were signifcantly afected by land use and logging of Eucalyptus plantations. The genes nosZ and archaeal amoA were signifcantly more abundant in native forest than in either young or old Eucalyptus plantations. Statistical analyses suggest that land use type has a greater impact on microbial community structure and functional gene abundance than Eucalyptus rotation. There was no correlation between GHG fuxes and shifts in microbial community, suggesting that microbial community structure and functional gene abundance are not the main drivers of GHG fuxes in this system.