Compositional and functional shifts in microbial communities due to soil warming

被引:608
作者
Zogg, GP
Zak, DR
Ringelberg, DB
MacDonald, NW
Pregitzer, KS
White, DC
机构
[1] UNIV TENNESSEE, CTR ENVIRONM BIOTECHNOL, KNOXVILLE, TN 37932 USA
[2] GRAND VALLEY STATE UNIV, DEPT BIOL, ALLENDALE, MI 49401 USA
[3] MICHIGAN TECHNOL UNIV, SCH FORESTRY, HOUGHTON, MI 49931 USA
关键词
D O I
10.2136/sssaj1997.03615995006100020015x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Microbial decomposition processes are typically described using first-order kinetics, and the effect of elevated temperature is modeled as an increase in the rate constant. However, there is experimental data to suggest that temperature increases the pool size of substrate C available for microbial respiration with little effect on first-order rate constants. We reasoned that changes in soil temperature alter the composition of microbial communities, wherein dominant populations at higher temperatures have the ability to metabolize substrates that are not used by members of the microbial community at lower temperatures. To gain insight into changes in microbial community composition and function following soil warming, we used molecular techniques of phospholipid Patty acid (PLFA) and lipopolysaccharide fatty acid (LPS-OHFA) analysis and compared the kinetics of microbial respiration for soils incubated from 5 to 25 degrees C. Substrate pools for microbial respiration and the abundance of PLFA and LPS-OHFA biomarkers for Gram-positive and Gram-negative bacteria differed significantly among temperature treatments, providing evidence for a shift in the function and composition of microbial communities related to soil warming. We suggest that shifts in microbial community composition following either large seasonal variation in soil temperature or smaller annual increases associated with global climate change have the potential to alter patterns of soil organic matter decomposition by a mechanism that is not considered by current simulation models.
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页码:475 / 481
页数:7
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