Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Conifer regeneration in stand-replacement portions of a large mixed-severity wildfire in the Klamath-Siskiyou Mountains

Donato, D.C., Fontaine, J.B.ORCID: 0000-0002-6515-7864, Campbell, J.L., Robinson, W.D., Kauffman, J.B. and Law, B.E. (2009) Conifer regeneration in stand-replacement portions of a large mixed-severity wildfire in the Klamath-Siskiyou Mountains. Canadian Journal of Forest Research, 39 (4). pp. 823-838.

[img]
Preview
PDF - Published Version
Download (1MB)
Link to Published Version: http://dx.doi.org/10.1139/X09-016
*Subscription may be required

Abstract

Large-scale wildfires (∼ 104-106 ha) have the potential to eliminate seed sources over broad areas and thus may lead to qualitatively different regeneration dynamics than in small burns; however, regeneration after such events has received little study in temperate forests. Following a 200000 ha mixed-severity wildfire in Oregon, USA, we quantified (1) conifer and broadleaf regeneration in stand-replacement patches 2 and 4 years postfire; and (2) the relative importance of isolation from seed sources (live trees) versus local site conditions in controlling regeneration. Patch-scale conifer regeneration density (72%-80% Douglas-fir (Pseudotsuga menziesii (Mirb). Franco)) varied widely, from 127 to 6494 stems-ha-1. Median densities were 1721 and 1603 stems-ha-1 2 and 4 years postfire, respectively, i.e., ∼12 times prefire overstory densities (134 stems-ha-1). Because of the complex burn mosaic, ∼58% of stand-replacement area was ≤200 m from a live-tree edge (seed source), and ∼81% was ≤400 m. Median conifer density exceeded 1000 stems-ha-1 out to a distance of 400 m from an edge before declining farther away. The strongest controls on regeneration were distance to live trees and soil parent material, with skeletal coarse-grained soils supporting lower densities (133 stems-ha-1) than fine-grained soils (729-1492 stems-ha-1). Other site factors (e.g., topography, broadleaf cover) had little association with conifer regeneration. The mixed-severity fire pattern strongly influenced the regeneration process by providing seed sources throughout much of the burned landscape.

Item Type: Journal Article
Murdoch Affiliation(s): School of Environmental Science
Publisher: NRC Research Press
URI: http://researchrepository.murdoch.edu.au/id/eprint/2575
Item Control Page Item Control Page

Downloads

Downloads per month over past year