Impacts of fire radiative flux on mature Pinus ponderosa growth and vulnerability to secondary mortality agents
Aaron M. Sparks A C , Alistair M. S. Smith A , Alan F. Talhelm A B , Crystal A. Kolden A , Kara M. Yedinak A and Daniel M. Johnson AA Department of Forest, Rangeland, and Fire Sciences, University of Idaho, Moscow, ID 83844, USA.
B Oak Ridge Institute for Science Education, National Center for Environmental Assessment, US Environmental Protection Agency, Research Triangle Park, NC 277094, USA.
C Corresponding author. Email: spar5010@vandals.uidaho.edu
International Journal of Wildland Fire 26(1) 95-106 https://doi.org/10.1071/WF16139
Submitted: 27 July 2016 Accepted: 6 November 2016 Published: 10 January 2017
Abstract
Recent studies have highlighted the potential of linking fire behaviour to plant ecophysiology as an improved route to characterising severity, but research to date has been limited to laboratory-scale investigations. Fine-scale fire behaviour during prescribed fires has been identified as a strong predictor of post-fire tree recovery and growth, but most studies report these metrics averaged over the entire fire. Previous research has found inconsistent effects of low-intensity fire on mature Pinus ponderosa growth. In this study, fire behaviour was quantified at the tree scale and compared with post-fire radial growth and axial resin duct defences. Results show a clear dose–response relationship between peak fire radiative power per unit area (W m–2) and post-fire Pinus ponderosa radial growth. Unlike in previous laboratory research on seedlings, there was no dose–response relationship observed between fire radiative energy per unit area (J m–2) and post-fire mature tree growth in the surviving trees. These results may suggest that post-fire impacts on growth of surviving seedlings and mature trees require other modes of heat transfer to impact plant canopies. This study demonstrates that increased resin duct defence is induced regardless of fire intensity, which may decrease Pinus ponderosa vulnerability to secondary mortality agents.
Additional keywords: conifers, fire behaviour, fire severity, post-fire impacts.
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