Home About us MoEF Contact us Sitemap Tamil Website  
About Envis
Whats New
Microorganisms
Research on Microbes
Database
Bibliography
Publications
Library
E-Resources
Microbiology Experts
Events
Online Submission
mn

Site Visitors

blog tracking


 
Soil Biology and Biochemistry
Vol. 65, 2013; Pages: 50 - 59

Do bacterial and fungal communities in soils of the Bolivian Altiplano change under shorter fallow periods?

L. Gomez-Montano, A. Jumpponen, M.A. Gonzales, J. Cusicanqui,C. Valdivia,P.P. Motavalli, M. Herman, K.A. Garrett

Department of Plant Pathology, Kansas State University, USA.

Abstract

Traditional fallow periods in the Bolivian highlands are being shortened in an effort to increase short-term crop yields, with potential long-term impacts on soil microbial communities and their functions. In addition, native vegetation, such as Parasthrephia sp. or Baccharis sp. (both locally known as ‘thola’) are often removed as a fuel for cooking. We evaluated the effects of fallow period and thola on soils in 29 farmers' fields in two municipalities in the Bolivian Altiplano (Umala and Ancoraimes). Soil fungal and bacterial community responses were characterized using 454-pyrosequencing. Soils in Ancoraimes had significantly higher levels of organic matter, nitrogen and other macronutrients compared to Umala. Ancoraimes soils also supported more diverse fungal communities, whereas Umala had more diverse bacterial communities. Unexpectedly, the longer fallow periods were associated with significantly lower fungal diversity in Umala and lower bacterial diversity in Ancoraimes. Fungi assigned to genera BionectriaDidymella, and Alternaria, and bacteria assigned to genera PaenibacillusSegetibacterand Modestobacter decreased in frequency with longer fallow period. The presence of thola was not associated with significantly different overall soil fungal or bacterial diversity, but was associated with higher frequency of some genera, such as Fusarium andBradyrhizobium. Our results indicate that fallow period has a range of effects on soil communities, and that the removal of thola may impact the dynamics of these communities.

Keywords: 454 Pyrosequencing; Andes; Bolivian highlands; Long fallow agriculture; Soil microbial communities; Barley; Potato; Quinoa


 

 

 
Copyright © 2005 ENVIS Centre ! All rights reserved
This site is optimized for 1024 x 768 screen resolution