scholarly journals The Bacterial Community Structure and Microbial Activity in a Traditional Organic Milpa Farming System Under Different Soil Moisture Conditions

2018 ◽  
Vol 9 ◽  
Author(s):  
Iván P. Moreno-Espíndola ◽  
María J. Ferrara-Guerrero ◽  
Marco L. Luna-Guido ◽  
Daniel A. Ramírez-Villanueva ◽  
Arit S. De León-Lorenzana ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Community Structure ◽  
Bacterial Community ◽  
Microbial Activity ◽  
Bacterial Community Structure ◽  
Farming System ◽  
Moisture Conditions ◽  
Milpa Farming

scholarly journals Effect of Sheep Urine Deposition on the Bacterial Community Structure in an Acidic Upland Grassland Soil

2006 ◽  
Vol 72 (11) ◽  
pp. 7231-7237 ◽  
Author(s):  
Deirdre Rooney ◽  
Nabla Kennedy ◽  
Louise Deering ◽  
Deirdre Gleeson ◽  
Nicholas Clipson
Keyword(s):  
Community Structure ◽  
Microbial Biomass ◽  
Bacterial Community ◽  
Microbial Activity ◽  
Community Composition ◽  
Plant Species ◽  
Bacterial Community Structure ◽  
Bacterial Community Composition ◽  
High Concentrations ◽  
Sheep Urine

ABSTRACT The effect of the addition of synthetic sheep urine (SSU) and plant species on the bacterial community composition of upland acidic grasslands was studied using a microcosm approach. Low, medium, and high concentrations of SSU were applied to pots containing plant species typical of both unimproved (Agrostis capillaris) and agriculturally improved (Lolium perenne) grasslands, and harvests were carried out 10 days and 50 days after the addition of SSU. SSU application significantly increased both soil pH (P < 0.005), with pH values ranging from pH 5.4 (zero SSU) to pH 6.4 (high SSU), and microbial activity (P < 0.005), with treatment with medium and high levels of SSU displaying significantly higher microbial activity (triphenylformazan dehydrogenase activity) than treatment of soil with zero or low concentrations of SSU. Microbial biomass, however, was not significantly altered by any of the SSU applications. Plant species alone had no effect on microbial biomass or activity. Bacterial community structure was profiled using bacterial automated ribosomal intergenic spacer analysis. Multidimensional scaling plots indicated that applications of high concentrations of SSU significantly altered the bacterial community composition in the presence of plant species but at different times: 10 days after application of high concentrations of SSU, the bacterial community composition of L. perenne-planted soils differed significantly from those of any other soils, whereas in the case of A. capillaris-planted soils, the bacterial community composition was different 50 days after treatment with high concentrations of SSU. Canonical correspondence analysis also highlighted the importance of interactions between SSU addition, plant species, and time in the bacterial community structure. This study has shown that the response of plants and bacterial communities to sheep urine deposition in grasslands is dependent on both the grass species present and the concentration of SSU applied, which may have important ecological consequences for agricultural grasslands.

scholarly journals Resolving environmental drivers of microbial community structure in Antarctic soils

2010 ◽  
Vol 22 (6) ◽  
pp. 673-680 ◽  
Author(s):  
Julie L. Smith ◽  
John E. Barrett ◽  
Gábor Tusnády ◽  
Lídia Rejtö ◽  
S. Craig Cary
Keyword(s):  
Soil Moisture ◽  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Abiotic Factors ◽  
Environmental Drivers ◽  
Dry Valleys ◽  
Molecular Fingerprinting ◽  
Antarctic Soils ◽  
Taylor Valley

AbstractAntarctic soils are extremely cold, dry, and oligotrophic, yet harbour surprisingly high bacterial diversity. The severity of environmental conditions has constrained the development of multi-trophic communities, and species richness and distribution is thought to be driven primarily by abiotic factors. Sites in northern and southern Victoria Land were sampled for bacterial community structure and soil physicochemical properties in conjunction with the US and New Zealand Latitudinal Gradient Project. Bacterial community structure was determined using a high-resolution molecular fingerprinting method for 80 soil samples from Taylor Valley and Cape Hallett sites which are separated by five degrees of latitude and have distinct soil chemistry. Taylor Valley is part of the McMurdo Dry Valleys, while Cape Hallett is the site of a penguin rookery and contains ornithogenic soils. The influence of soil moisture, pH, conductivity, ammonia, nitrate, total nitrogen and organic carbon on community structure was revealed using Spearman rank correlation, Mantel test, and principal components analysis. High spatial variability was detected in bacterial communities and community structure was correlated with soil moisture and pH. Both unique and shared bacterial community members were detected at Taylor Valley and Cape Hallett despite the considerable distance between the sites.

Temporally invariable bacterial community structure in the Arabian Sea oxygen minimum zone

2014 ◽  
Vol 73 (1) ◽  
pp. 51-67 ◽  
Author(s):  
A Jain ◽  
M Bandekar ◽  
J Gomes ◽  
D Shenoy ◽  
RM Meena ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Arabian Sea ◽  
Oxygen Minimum Zone ◽  
Minimum Zone ◽  
Oxygen Minimum
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