Publication:
Changes in substrate availability drive carbon cycle response to chronic warming

dc.contributor.authorPold, Grace
dc.contributor.authorGrandy, A. Stuart
dc.contributor.authorMelillo, Jerry M.
dc.contributor.authorDeAngelis, Kristen
dc.contributor.departmentUniversity of Massachusetts Amherst
dc.contributor.departmentUniversity of New Hampshire
dc.contributor.departmentThe Ecosystems Center
dc.contributor.departmentUniversity of Massachusetts Amherst
dc.date2023-09-23T19:57:48.000
dc.date.accessioned2024-04-26T18:44:17Z
dc.date.available2018-01-16T00:00:00Z
dc.date.issued2017-01-01
dc.description.abstractAs earth's climate continues to warm, it is important to understand how the capacity of terrestrial ecosystems to retain carbon (C) will be affected. We combined measurements of microbial activity with the concentration, quality, and physical accessibility of soil carbon to microorganisms to evaluate the mechanisms by which more than two decades of experimental warming has altered the carbon cycle in a Northeast US temperate deciduous forest. We found that concentrations of soil organic matter were reduced in both the organic and mineral soil horizons. The molecular composition of the carbon was altered in the mineral soil with significant reductions in the relative abundance of polysaccharides and lignin, and an increase in lipids. Mineral-associated organic matter was preferentially depleted by warming in the top 3 cm of mineral soil. We found that potential extracellularenzyme activity per gram of soil at a common temperature was generally unaffected by warming treatment. However, by measuring potential extracellular enzyme activities between 4 and 30 °C, we found that activity per unit microbial biomass at in-situ temperatures was increased by warming. This was associated with a tendency for microbial biomass to decrease with warming. These results indicate that chronic warming has reduced soil organic matter concentrations, selecting for a smaller but more active microbial community increasingly dependent on mineral-associated organic matter.
dc.description.pages68-78
dc.identifier.doi10.1016/j.soilbio.2017.03.002
dc.identifier.urihttps://hdl.handle.net/20.500.14394/35241
dc.relation.ispartofSoil Biology and Biochemistry
dc.relation.urlhttps://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1304&context=micro_faculty_pubs&unstamped=1
dc.rightsUMass Amherst Open Access Policy
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.source.issue110
dc.source.statuspublished
dc.subjectsoil carbon
dc.subjectclimate feedbacks
dc.subjectenzyme activity
dc.subjectmicrobial adaptation
dc.subjectMicrobiology
dc.titleChanges in substrate availability drive carbon cycle response to chronic warming
dc.typearticle
dc.typearticle
digcom.contributor.authorPold, Grace
digcom.contributor.authorGrandy, A. Stuart
digcom.contributor.authorMelillo, Jerry M.
digcom.contributor.authorisAuthorOfPublication|email:deangelis@microbio.umass.edu|institution:University of Massachusetts Amherst|DeAngelis, Kristen
digcom.date.embargo2018-01-16T00:00:00-08:00
digcom.identifiermicro_faculty_pubs/306
digcom.identifier.contextkey11368738
digcom.identifier.submissionpathmicro_faculty_pubs/306
dspace.entity.typePublication
relation.isAuthorOfPublication4ed2ca26-8627-40f2-b0f3-1503c982d848
relation.isAuthorOfPublication.latestForDiscovery4ed2ca26-8627-40f2-b0f3-1503c982d848
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
1_s2.0_S0038071716302851_main.pdf
Size:
1.29 MB
Format:
Adobe Portable Document Format