Document


Title

Long-term forest floor carbon dynamics after fire in upland boreal forests of western Canada
Document Type: Journal Article
Author(s): I. A. Nalder; R. W. Wein
Publication Year: 1999

Cataloging Information

Keyword(s):
  • age classes
  • Alberta
  • boreal forests
  • Canada
  • carbon
  • catastrophic fires
  • coniferous forests
  • disturbance
  • fire frequency
  • fire management
  • forbs
  • forest management
  • grasses
  • heavy fuels
  • legumes
  • lichens
  • Manitoba
  • mineral soils
  • mosses
  • Pinus banksiana
  • Populus
  • Populus tremuloides
  • precipitation
  • Saskatchewan
  • shrubs
  • soil management
  • soils
  • temperature
  • trees
  • understory vegetation
  • vegetation surveys
  • wildfires
Record Maintained By:
Record Last Modified: June 1, 2018
FRAMES Record Number: 45918
Tall Timbers Record Number: 21543
TTRS Location Status: In-file
TTRS Call Number: Fire File
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

We examined the long-term dynamics of upland boreal forest floors after disturbance by fire. We selected two important and contrasting upland tree species, Pinus banksiana (jack fine) and Populus tremuloides (trembling aspen), in three distinct climatic zones across the boreal forest of western Canada, and sampled 80 fire-originated stands divided into six chronosequences with ages ranging from 14 to 149 years. The forest floor was a large component of carbon storage. Averaged across ages and zones, it was 1.31 and 2.78 kg C m-2 for P. banksiana and P. tremuloides, respectively, compared with 4.03 and 5.56 kg C m-2 in aboveground trees. These data exclude decomposing coarse woody debris, which was a significant component of the forest floor (0.18/0.13 kg C m-2) and requires further study. The contributions from shrubs (0.035/0.151 kg C m-2), ground vegetation (0.019/0.026 kg C m-2), and moss-plus-lichen (0.179/0.004 kg C m-2) were relatively small. An analysis of covariance (ANCOVA) model showed that forest floor carbon was positively related to stand age, as well as being affected by species and climate zone. Much of the variability was explained by species, and species-specific regression models showed that for P. tremuloides forest floor carbon was strongly related to stand age, mean annual temperature, and mean annual precipitation, and for P. banksiana, forest floor carbon was strongly related to an index of moss dominance. The regression models suggest that the forest floor carbon pool in upland forests of the western Canadian boreal will be sensitive to climate change, but this sensitivity would need to be tested with process-based models. © 1999 by the American Geophysical Union.

Citation:
Nalder, I. A., and R. W. Wein. 1999. Long-term forest floor carbon dynamics after fire in upland boreal forests of western Canada. Global Biogeochemical Cycles, v. 13, no. 4, p. 951-968.