Variations in microbial community composition through two soil depth profiles

Microbial community structure mediates response of soil C decomposition to litter addition and warming

“…Although other groups (particularly gram-negative bacteria) may also have contributed to differences in the direction of priming between litter treatments, only gram-positive bacteria showed a consistent response to temperature. A meta-analysis by Allison and Martiny (2008) found that the majority (80%) of soil-warming experiments showed changes in microbial community structure, and many studies (although not all) show increases in gram-positive bacteria (Zogg et al, 1997;Rinnan et al, 2007;Frey et al, 2008;Feng and Simpson, 2009;Schindlbacher et al, 2011;Ziegler et al, 2013;Wei et al, 2014;Xiong et al, 2014); a microbial group associated with soil-C decomposition in this study and often associated with mineral C decomposition and low substrate availability (Fierer et al, 2003;Kramer and Gleixner, 2008). The results from our study suggest that this microbial group may potentially mediate the response of soil-C mineralization and priming in a warming climate.…”

Effects of super absorbent polymers on soil microbial properties and Chinese cabbage (Brassica chinensis) growth

“…Both aboveground and belowground factors might affect microbial biomass and, therefore, nutrient availability (García et al 2002;Schade and Hobbie 2005). In this study, soil chemical and physical characteristics, like SOM and soil structure and texture, may also constrain microbial growth (Hassink 1994), and then, the variability of these properties along the soil profile can be reflected in microbial communities (Fierer et al 2003). Our result had demonstrated the Lowercase letters indicate the significant differences between SAP treatments in the same WC treatment (P<0.05).…”

Spatial Variation in Streptomyces Genetic Composition and Diversity in a Prairie Soil

“…Over a wide range of depths from tens of centimeters to meters, other researchers have shown that genetic diversity tends to decrease with increasing soil depth [18,24,34,35,61,75]. This decrease in diversity has been attributed to a variety of factors, including soil moisture and carbon and nitrogen availability.…”

“…In contrast, locations 2 and 3 were dominated by OTU 1 (26 out of 55 and 22 out of 49 isolates, respectively). Eight OTUs were represented only once at location 1; four of these OTUs (16)(17)(18)(19) were found only in location 1. Location 2 had 11 OTUs found once (nine unique to the sample), whereas location 3 had eight OTUs (five unique to the sample) represented by a single isolate.…”