Document


Title

Interannual variability of surface energy exchange depends on stand age in a boreal forest fire chronosequence
Document Type: Journal Article
Author(s): H. P. Liu; J. T. Randerson
Publication Year: 2008

Cataloging Information

Keyword(s):
  • age classes
  • boreal forests
  • catastrophic fires
  • deciduous plants
  • energy
  • fire management
  • fire regimes
  • forest management
  • wildfires
Topic(s):
Region(s):
Record Maintained By:
Record Last Modified: June 1, 2018
FRAMES Record Number: 52676
Tall Timbers Record Number: 29841
TTRS Location Status: Not in file
TTRS Call Number: Available
TTRS Abstract Status: Okay, Fair use, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.

Description

Understanding how changes in the boreal fire regime will affect high latitude climate requires knowledge of the sensitivity of the surface energy budget to shifts in vegetation cover. We measured components of the surface energy budget in three ecosystems that were part of a fire chronosequence in interior Alaska for 3 years. Our sites were within the perimeter of stand-replacing fires that occurred in 1999, 1987, and ~1920 (hereafter referred to as the 1999-burn, the 1987-burn, and the control). Vegetation cover consisted primarily of sparse short grasses at the 1999-burn, aspen and willow (deciduous trees and shrubs) at the 1987-burn, and black spruce (evergreen conifer trees) at the control. Averaged over the 3 years of our study, annual net radiation decreased by approximately 25% at the 1999-burn and 30% at the 1987-burn, relative to the control. Sensible heat decreased by an even larger amount, by approximately 57% for the 1999-burn and 44% for the 1987-burn as compared with the control. Climate during spring and summer varied considerably among the 3 years. The three stands responded differently to this climate variability with consequences for surface energy exchange. As a result of earlier snow cover loss in 2003 and 2004, net radiation during spring increased substantially in the recently disturbed stands, but not in the control. In response to a sustained summer drought in 2004, latent heat decreased more in the 1987-burn during August than in the control. Our results imply that a shift in plant functional types expected to accompany increases in boreal fire activity may amplify interannual climate variability during both spring and summer. © 2008 by the American Geophysical Union.

Online Link(s):
Citation:
Liu, H. P., and J. T. Randerson. 2008. Interannual variability of surface energy exchange depends on stand age in a boreal forest fire chronosequence. JGR.Biogeosciences, v. 113, no. G1, p. G01006 [article no. online]-13 pp [total pages online]. 10.1029/2007JG000483. http://onlinelibrary.wiley.com/doi/10.1029/2007JG000483/pdf.