Document


Title

Interactions between soil thermal and hydrological dynamics in the response of Alaska ecosystems to fire disturbance
Document Type: Journal Article
Author(s): Shuhua Yi; A. David McGuire; Jennifer W. Harden; Eric S. Kasischke; Kristen L. Manies; Larry D. Hinzman; Anna Liljedahl; James T. Randerson; Heping Liu; Vladimir E. Romanovsky; Sergei Marchenko; Yongwon Kim
Publication Year: 2009

Cataloging Information

Keyword(s):
  • air temperature
  • black spruce
  • disturbance
  • drainage
  • fire management
  • forest management
  • mineral soils
  • Picea mariana
  • precipitation
  • soil management
  • soil moisture
  • soil organic matter
  • soil temperature
  • tundra
  • wildfires
Region(s):
Record Maintained By:
Record Last Modified: April 30, 2019
FRAMES Record Number: 52708
Tall Timbers Record Number: 29874
TTRS Location Status: Not in file
TTRS Call Number: Available
TTRS Abstract Status: Fair use, Okay, 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

Soil temperature and moisture are important factors that control many ecosystem processes. However, interactions between soil thermal and hydrological processes are not adequately understood in cold regions, where the frozen soil, fire disturbance, and soil drainage play important roles in controlling interactions among these processes. These interactions were investigated with a new ecosystem model framework, the dynamic organic soil version of the Terrestrial Ecosystem Model, that incorporates an efficient and stable numerical scheme for simulating soil thermal and hydrological dynamics within soil profiles that contain a live moss horizon, fibrous and amorphous organic horizons, and mineral soil horizons. The performance of the model was evaluated for a tundra burn site that had both preburn and postburn measurements, two black spruce fire chronosequences (representing space-for-time substitutions in well and intermediately drained conditions), and a poorly drained black spruce site. Although space-for-time substitutions present challenges in model-data comparison, the model demonstrates substantial ability in simulating the dynamics of evapotranspiration, soil temperature, active layer depth, soil moisture, and water table depth in response to both climate variability and fire disturbance. Several differences between model simulations and field measurements identified key challenges for evaluating/improving model performance that include (1) proper representation of discrepancies between air temperature and ground surface temperature; (2) minimization of precipitation biases in the driving data sets; (3) improvement of the measurement accuracy of soil moisture in surface organic horizons; and (4) proper specification of organic horizon depth/properties, and soil thermal conductivity. © 2009 by the American Geophysical Union.

Online Link(s):
Citation:
Yi, S.-H. et al. 2009. Interactions between soil thermal and hydrological dynamics in the response of Alaska ecosystems to fire disturbance. Journal of Geophysical Research, v. 114, p. G02015 [online article no.]-20 pp [total online pages]. 10.1029/2008JG000841. http://citeseerx.ist.psu.edu/viewdoc/download?rep=rep1&type=pdf&doi=10.1.1.210.2916.