title: [Distribution of potentially nitrogen-fixing bacteria and its relationship with physicochemical parameters in soils with three vegetation types in the southern Colombian Amazon region].
abstract: Potentially nitrogen-fixing microaerobic and aerobic bacteria were isolated from several Colombian Amazon soils (forest, pastures and chagras) and two landscapes (floodable and non floodable areas). The abundance and distribution of bacteria were evaluated, as well as their relationship with soil physical and chemical characteristics. Landscape had a direct influence on the abundance of the microaerobic bacteria, with higher numbers in forest and pasture soils in non-floodable zones. The aerobic isolates (N=51) were grouped into 19 morphologies, with the highest numbers found in forest soil in floodable zones. A higher number of aerobic morphologies was shared among forest sites (Nonmetric Multidimensional Scaling and Analysis of Similarity p<0.05), and 40% of the distribution was explained by lime percentage and Al concentration.
authors.affiliation: Instituto Amazónico de Investigación Científica-SINCHI, Bogotá DC, Colombia.
authors.forename: Andrea J
authors.initials: AJ
authors.lastname: Mantilla-Paredes
authors.forename: Gladys I
authors.initials: GI
authors.lastname: Cardona
authors.forename: Clara P
authors.initials: CP
authors.lastname: Peña-Venegas
authors.forename: Uriel
authors.initials: U
authors.lastname: Murcia
authors.forename: Mariana
authors.initials: M
authors.lastname: Rodríguez
authors.forename: Maria M
authors.initials: MM
authors.lastname: Zambrano
mesh_terms: D001420:Bacteria, Aerobic / Q000145:classification / Q000302:isolation & purification / Q000378:metabolism*; D003105:Colombia; D015169:Colony Count, Microbial; D009586:Nitrogen Fixation; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D014197:Trees
chemical_list: D012987:Soil