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Title: Intermediate time scale response of atmospheric CO 2 following prescribed fire in a longleaf pine forest

Fire plays an essential role in maintaining the structure and function of longleaf pine ecosystems. While the effects of fire on carbon cycle have been measured in previous studies for short periods during a burn and for multiyear periods following the burn, information on how carbon cycle is influenced by such changes over the span of a few weeks to months has yet to be quantified. We have analyzed high-frequency measurements of CO 2 concentration and flux, as well as associated micrometeorological variables, at three levels of the tall Aiken AmeriFlux tower during and after a prescribed burn. Measurements of the CO 2 concentration and vertical fluxes were examined as well as calculated net ecosystem exchange (NEE) for periods prior to and after the burn. Large spikes in both CO 2 concentration and CO 2 flux during the fire and increases in atmospheric CO 2 concentration and reduced CO 2 flux were observed for several weeks following the burn, particularly below the forest canopy. Both CO 2 measurements and NEE were found to return to their preburn states within 60–90 days following the burn when no statistical significance was found between preburn and postburn NEE. Furthermore, this study examines themore » micrometeorological conditions during a low-intensity prescribed burn and its short-term effects on local CO 2 dynamics in a forested environment by identifying observable impacts on local measurements of atmospheric CO 2 concentration and fluxes.« less
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [3]
  1. Savannah River National Lab., Aiken, SC (United States)
  2. United States Forest Service-Savannah River, New Ellenton, SC (United States)
  3. Univ. of Georgia, Griffin, GA (United States)
  4. Univ. of Alabama, Tuscaloosa, AL (United States)
  5. Savannah River National Lab., Aiken, SC (United States); Univ. of Georgia, Athens, GA (United States)
Publication Date:
Report Number(s):
SRNS-STI-2016-00614
Journal ID: ISSN 2169-8953
Grant/Contract Number:
AC09-08SR22470
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 121; Journal Issue: 10; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Research Org:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; prescribed fire; carbon cycle; AmeriFlux
OSTI Identifier:
1368681
Alternate Identifier(s):
OSTI ID: 1402139