Changes of Soil Bacterial Diversity as a Consequence of Agricultural Land Use in a Semi-Arid Ecosystem
- Federal Research Centre for Cultivated Plants (JKI), Braunschweig (Germany); DOE/OSTI
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Federal Research Centre for Cultivated Plants (JKI), Braunschweig (Germany)
- Johann Heinrich von Thunen-Institut (TI), Braunschweig (Germany)
- Centro de Investigaciones biologicas del Noroeste, S.C. La Paz (Mexico)
Natural scrublands in semi-arid deserts are increasingly being converted into fields. This results in losses of characteristic flora and fauna, and may also affect microbial diversity. In the present study, the long-term effect (50 years) of such a transition on soil bacterial communities was explored at two sites typical of semi-arid deserts. Comparisons were made between soil samples from alfalfa fields and the adjacent scrublands by two complementary methods based on 16S rRNA gene fragments amplified from total community DNA. Denaturing gradient gel electrophoresis (DGGE) analyses revealed significant effects of the transition on community composition of Bacteria, Actinobacteria, Alpha- and Betaproteobacteria at both sites. PhyloChip hybridization analysis uncovered that the transition negatively affected taxa such as Acidobacteria, Chloroflexi, Acidimicrobiales, Rubrobacterales, Deltaproteobacteria and Clostridia, while Alpha-, Beta- and Gammaproteobacteria, Bacteroidetes and Actinobacteria increased in abundance. Redundancy analysis suggested that the community composition of phyla responding to agricultural use (except for Spirochaetes) correlated with soil parameters that were significantly different between the agricultural and scrubland soil. The arable soils were lower in organic matter and phosphate concentration, and higher in salinity. The variation in the bacterial community composition was higher in soils from scrubland than from agriculture, as revealed by DGGE and PhyloChip analyses, suggesting reduced beta diversity due to agricultural practices. The long-term use for agriculture resulted in profound changes in the bacterial community and physicochemical characteristics of former scrublands, which may irreversibly affect the natural soil ecosystem.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Concejo Nacional de Ciencia Y Tecnologia (CONACYT); German Federal Ministry for Education and Research; USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1627594
- Journal Information:
- PLoS ONE, Journal Name: PLoS ONE Journal Issue: 3 Vol. 8; ISSN 1932-6203
- Publisher:
- Public Library of ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Scale-dependent effects of climate and geographic distance on bacterial diversity patterns across northern China's grasslands
Humic Acid-Oxidizing, Nitrate-Reducing Bacteria in Agricultural Soils
Multi-analytical approach reveals potential microbial indicators in soil for sugarcane model systems
Journal Article
·
Thu Oct 29 20:00:00 EDT 2015
· FEMS Microbiology Ecology (Online)
·
OSTI ID:1579917
Humic Acid-Oxidizing, Nitrate-Reducing Bacteria in Agricultural Soils
Journal Article
·
Mon Jul 11 20:00:00 EDT 2011
· mBio (Online)
·
OSTI ID:1626080
Multi-analytical approach reveals potential microbial indicators in soil for sugarcane model systems
Journal Article
·
Mon Jun 08 20:00:00 EDT 2015
· PLoS ONE
·
OSTI ID:1212414