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Long-Term Warming Alters Carbohydrate Degradation Potential in Temperate Forest Soils
Applied and Environmental Microbiology
  • Grace Pold, University of Massachusetts Amherst
  • Andrew F. Billings, University of Massachusetts Amherst
  • Jeff L. Blanchard, University of Massachusetts Amherst
  • Daniel B. Burkhardt, University of Massachusetts Amherst
  • Serita D. Frey, University of New Hampshire
  • Jerry M. Melillo, The Ecosystems Center
  • Julia Schnabel, University of Massachusetts Amherst
  • Linda T.A. van Diepen, University of New Hampshire
  • Kristen DeAngelis, University of Massachusetts Amherst
Publication Date
2016
Abstract

As Earth's climate warms, soil carbon pools and the microbial communities that process them may change, altering the way in which carbon is recycled in soil. In this study, we used a combination of metagenomics and bacterial cultivation to evaluate the hypothesis that experimentally raising soil temperatures by 5°C for 5, 8, or 20 years increased the potential for temperate forest soil microbial communities to degrade carbohydrates. Warming decreased the proportion of carbohydrate-degrading genes in the organic horizon derived from eukaryotes and increased the fraction of genes in the mineral soil associated with Actinobacteria in all studies. Genes associated with carbohydrate degradation increased in the organic horizon after 5 years of warming but had decreased in the organic horizon after warming the soil continuously for 20 years. However, a greater proportion of the 295 bacteria from 6 phyla (10 classes, 14 orders, and 34 families) isolated from heated plots in the 20-year experiment were able to depolymerize cellulose and xylan than bacterial isolates from control soils. Together, these findings indicate that the enrichment of bacteria capable of degrading carbohydrates could be important for accelerated carbon cycling in a warmer world.

Disciplines
DOI
10.1128/AEM.02012-16
Creative Commons License
Creative Commons Attribution 4.0
License
UMass Amherst Open Access Policy
Citation Information
Grace Pold, Andrew F. Billings, Jeff L. Blanchard, Daniel B. Burkhardt, et al.. "Long-Term Warming Alters Carbohydrate Degradation Potential in Temperate Forest Soils" Applied and Environmental Microbiology Vol. 82 Iss. 22 (2016)
Available at: http://works.bepress.com/kristen_deangelis/21/