Microbial community structure and function: The effect of silvicultural burning and topographic variability in northern Alberta

Swallow, Mathew J.B.; Quideau, Sylvie A.; MacKenzie, M. Derek; Kishchuk, Barbara E.

doi:10.1016/j.soilbio.2009.01.014

Cited by 86 publications

(29 citation statements)

References 45 publications

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“…Central questions regarding microbial communities include the controls of the distribution and abundance of species and functional groups and how these communities change with time in response to their environment. Many different factors have been shown to affect soil microbial communities, including soil types (Bossio et al, 1998), vegetation cover and seasonality (Habekost et al, 2008), and natural and anthropogenic disturbances such as burning (Swallow et al, 2009). Land use changes and management have also been found to alter microbial community structure (Drenovsky et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Although it does not allow for differentiation of microorganisms at the species level, it provides a quantitative assessment of the various active groups within the microbial community. In addition, specific shifts in the ratios of certain individual compounds can be used as a measurement of stress in the community (Persson et al, 1989;Tunlid & White, 1992;Heipieper et al, 1996). Microbial fatty acids are mainly composed of five types of lipids: saturated straight and branched chain, usually produced by Gram-positive bacteria (O'Leary & Wilkinson, 1988); monounsaturated and cyclopropane, common in Gram-negative bacteria (Wilkinson, 1988); and polyunsaturated fatty acids, characteristic of eukaryotic organisms (Federle, 1986).…”

Section: Introductionmentioning

confidence: 99%

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Microbial communities in Cerrado soils under native vegetation subjected to prescribed fire and under pasture

Viana¹,

Bustamante

Molina³

et al. 2011

Pesq. agropec. bras.

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The objective of this work was to evaluate the effects of fire regimes and vegetation cover on the structure and dynamics of soil microbial communities, through phospholipid fatty acid (PLFA) analysis. Comparisons were made between native areas with different woody covers ("cerrado stricto sensu" and "campo sujo"), under different fire regimes, and a 20-year-old active palisadegrass pasture in the Central Plateau of Brazil. Microbial biomass was higher in the native plots than in the pasture, and the highest monthly values were observed during the rainy season in the native plots. No significant differences were observed between fire regimes or between communities from the two native vegetation types. However, the principal component (PC) analysis separated the microbial communities by vegetation cover (native x pasture) and season (wet x dry), accounting for 45.8% (PC1 and PC3) and 25.6% (PC2 and PC3), respectively, of the total PLFA variability. Changes in land cover and seasonal rainfall in Cerrado ecosystems have significant effects on the total density of soil microorganisms and on the abundance of microbial groups, especially Gram-negative and Gram-positive bacteria.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microbial communities in Cerrado soils under native vegetation subjected to prescribed fire and under pasture

Viana¹,

Bustamante

Molina³

et al. 2011

Pesq. agropec. bras.

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“…Landscape factors that may influence the occurrence and abundance of microorganisms include geographic location (14), topographic features such as drainages (15), and soil characteristics across spatial scales (16). Contemporary soil environmental conditions include organic C availability (17), nutrient content (18), SWC and temperature (19), and vegetative cover (20).…”

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confidence: 99%

Landscape Position Influences Microbial Composition and Function via Redistribution of Soil Water across a Watershed

Riveros-Iregui

Jones

et al. 2015

Appl Environ Microbiol

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g Subalpine forest ecosystems influence global carbon cycling. However, little is known about the compositions of their soil microbial communities and how these may vary with soil environmental conditions. The goal of this study was to characterize the soil microbial communities in a subalpine forest watershed in central Montana (Stringer Creek Watershed within the Tenderfoot Creek Experimental Forest) and to investigate their relationships with environmental conditions and soil carbonaceous gases. As assessed by tagged Illumina sequencing of the 16S rRNA gene, community composition and structure differed significantly among three landscape positions: high upland zones (HUZ), low upland zones (LUZ), and riparian zones (RZ). Soil depth effects on phylogenetic diversity and ␤-diversity varied across landscape positions, being more evident in RZ than in HUZ. Mantel tests revealed significant correlations between microbial community assembly patterns and the soil environmental factors tested (water content, temperature, oxygen, and pH) and soil carbonaceous gases (carbon dioxide concentration and efflux and methane concentration). With one exception, methanogens were detected only in RZ soils. In contrast, methanotrophs were detected in all three landscape positions. Type I methanotrophs dominated RZ soils, while type II methanotrophs dominated LUZ and HUZ soils. The relative abundances of methanotroph populations correlated positively with soil water content (R ‫؍‬ 0.72, P < 0.001) and negatively with soil oxygen (R ‫؍‬ ؊0.53, P ‫؍‬ 0.008). Our results suggest the coherence of soil microbial communities within and differences in communities between landscape positions in a subalpine forested watershed that reflect historical and contemporary environmental conditions. I n the western United States, approximately 70% of carbon sink activity is located at elevations above 750 m, where 50 to 85% of land is dominated by hilly or mountainous topography (1). Fluxes of carbonaceous gases, such as carbon dioxide (CO 2 ) and methane (CH 4 ), significantly affect the size of the carbon sink, with soil respiration accounting for the largest terrestrial CO 2 flux to the atmosphere (2). CO 2 in soil pore spaces is derived primarily from autotrophic (root) and heterotrophic (microbe) respiration, which is mediated by environmental factors such as temperature, soil water content (SWC), O 2 availability, and organic matter (3-5). The direction and intensity of CH 4 flux depends on the local balance of the CH 4 consumption by methanotrophs and CH 4 production by methanogens, both of which also are subject to such environmental influences. Because diffusive gas transport through soils is reduced with increasing SWC, hydrologic variations can strongly affect soil O 2 levels, which in turn influence the relative rates of (anaerobic) methanogenesis and (aerobic) methanotrophy. Although saturated soils (e.g., wetlands) are major terrestrial sources of CH 4 emissions (6), emission may at times occur from unsaturated soils, depending on th...

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“…This technique has been extensively used to characterize the structural composition of microbial communities found in a wide range of environments, ranging from forests [3][4] to prairies [5][6] and agricultural fields 7 . It has been successfully applied in characterizing soil response to land management changes, including forest clear-cutting 8 , liming 9 , reclamation [10][11][12] , as well as disturbances such as fire 13 , contamination by metals 14 and hydrocarbons 15 , and insect outbreak 16 .…”

Section: Introductionmentioning

confidence: 99%

Extraction and Analysis of Microbial Phospholipid Fatty Acids in Soils

Quideau

McIntosh

Norris

et al. 2016

JoVE

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Phospholipid fatty acids (PLFAs) are key components of microbial cell membranes. The analysis of PLFAs extracted from soils can provide information about the overall structure of terrestrial microbial communities. PLFA profiling has been extensively used in a range of ecosystems as a biological index of overall soil quality, and as a quantitative indicator of soil response to land management and other environmental stressors.

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Microbial community structure and function: The effect of silvicultural burning and topographic variability in northern Alberta

Cited by 86 publications

References 45 publications

Microbial communities in Cerrado soils under native vegetation subjected to prescribed fire and under pasture

Microbial communities in Cerrado soils under native vegetation subjected to prescribed fire and under pasture

Landscape Position Influences Microbial Composition and Function via Redistribution of Soil Water across a Watershed

Extraction and Analysis of Microbial Phospholipid Fatty Acids in Soils

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