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This study estimated the population density of microorganisms associated with the metabolism of nitrogen N in soils with three uses: potato crop, livestock and low intervention zones high plains or páramo in El Bosque district of Los Nevados National Natural Park in Colombia. The following microorganisms were indirectly quantified: amonifiers AMO, proteolytic PRO, ammonium oxidizing BOA, nitrite oxidizing BON and denitrifiers DEN in soils of three farms located at different altitudes and under two climatic seasons. The non-parametric Kruskal-Wallis paired test with a significance level of P andlt; 0.05 was used to detect statistically significant differences among abundances of functional groups of microorganisms. Then a principal component analysis PCA was performed to evaluate the relationships among different variables. The results showed differences among all the groups, with páramo soils having the lowest density of microorganisms in the soil. The PRO microorganisms were the most abundant in all soils, followed by DEN, with a higher density in the páramo ecosystem. The microbial population density was not significantly affected by altitude but showed some differences that did not have a unique behavior pattern. Additionally, differences were seen in the seasons, being higher in the dry season for the PRO, AMO, BOA and BON groups; and in the rainy season for DEN. This study provided knowledge of the relationships between land use and the presence of microorganisms associated with the nitrogen cycle., En la vereda El Bosque del Parque Nacional Natural de Los Nevados PNNN, Colombia, se estimó la densidad poblacional de microorganismos asociados con el metabolismo de nitrógeno N en suelos bajo tres sistemas de uso: cultivo de papa, ganadería y zonas poco intervenidas páramo. Indirectamente se cuantificaron microorganismos amonificantes AMO, proteolíticos PRO, oxidantes del amonio BOA, oxidantes del nitrito BON y denitrificantes DEN en suelos de tres fincas ubicadas a diferente altitud y en épocas seca y lluviosa. Se realizó la prueba no-paramétrica de Kruskal-Wallis por pares, con un nivel de significancia P

Tipo de documento: Artículo - Article

Palabras clave: Amonificantes, denitrificantes, oxidantes del amonio, oxidantes del nitrito, proteolíticos; Ammonium oxidizing, amonifiers, denitrifiers, nitrite oxidizing, proteolytic, Ammonium oxidizing, amonifiers, denitrifiers, nitrite oxidizing, proteolytic.





Fuente: http://www.bdigital.unal.edu.co


Introducción



Associated microorganisms to the nitrogen cycle in soils under three systems of use: potato crop, livestock and páramo, in Los Nevados National Natural Park, Colombia Microorganismos asociados al ciclo del nitrógeno en suelos bajo tres sistemas de uso: cultivo de papa, ganaderia y páramo, en el Parque Los Nevados, Colombia Roger Guillermo Cañón-Cortázar1,4†, Lizeth Manuela Avellaneda-Torres2,4‡, and Esperanza TorresRojas3,4* 1 Agronomist Engineer.
2Chemist, M.Sc.
3Biologist, Ph.D., Associated profesor, exclusive dedication.
4Faculty of Agronomy, Universidad Nacional de Colombia and Colombian Center of Genomics and Bioinformatics in Extreme environments – GEBIX, Bogot[a, Colombia.
*corresponding author: etorresr@unal.edu.co; †rgcaconc@unal.edu.co; ‡lmavellanedat@unal.edu.co Rec.: 14.08.12 Acept.: 06.11.12 Abstract This study estimated the population density of microorganisms associated with the metabolism of nitrogen (N) in soils with three uses: potato crop, livestock and low intervention zones (high plains or páramo) in El Bosque district of Los Nevados National Natural Park in Colombia.
The following microorganisms were indirectly quantified: amonifiers (AMO), proteolytic (PRO), ammonium oxidizing (BOA), nitrite oxidizing (BON) and denitrifiers (DEN) in soils of three farms located at different altitudes and under two climatic seasons.
The non-parametric Kruskal-Wallis paired test with a significance level of P 0.05 was used to detect statistically significant differences among abundances of functional groups of microorganisms.
Then a principal component analysis (PCA) was performed to evaluate the relationships among different variables.
The results showed differences among all the groups, with páramo soils having the lowest density of microorganisms in the soil.
The PRO microorganisms were the most abundant in all soils, followed by DEN, with a higher density in the páramo ecosystem.
The microbial population density was not significantly...






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