Postfire survival in Douglas-fir and lodgepole pine: comparing the effects of crown and bole damage

1986 ◽  
Vol 16 (6) ◽  
pp. 1175-1179 ◽  
Author(s):  
David L. Peterson ◽  
Michael J. Arbaugh
Keyword(s):  
Rocky Mountains ◽  
Regression Models ◽  
Lodgepole Pine ◽  
Late Summer ◽  
Important Variable ◽  
Douglas Fir ◽  
Northern Rocky Mountains ◽  
Logistic Regression Models ◽  
Crown Scorch ◽  
Survival Patterns

Survival patterns after late summer wildfires were evaluated for Douglas-fir and lodgepole pine in the northern Rocky Mountains. Crown scorch was the most important variable for predicting postfire survival and variables representing bole damage improved the significance of logistic regression models for both species. Crown scorch and basal scorch were the best combination of variables for predicting survival in lodgepole pine. Crown scorch and insect damage were the best combination of variables for predicting survival in Douglas-fir. Postfire survival of lodgepole pine, which has relatively thin bark, was more sensitive than Douglas-fir to variables that quantified bole damage.

scholarly journals Predicting Postfire Survival in Coulter Pine (Pinus coulteri) and Gray Pine (Pinus sabiniana) after Wildfire in Central California

2002 ◽  
Vol 17 (3) ◽  
pp. 134-138 ◽  
Author(s):  
Mark Borchert ◽  
David Schreiner ◽  
Tim Knowd ◽  
Tim Plumb
Keyword(s):  
Regression Models ◽  
Important Variable ◽  
Fire Damage ◽  
Central California ◽  
Logistic Regression Models ◽  
Probability Of Survival ◽  
Crown Scorch ◽  
A Site ◽  
Pinus Coulteri ◽  
Bark Char

Abstract Factors related to the survival of Coulter pine (Pinus coulteri) and gray pine (P. sabiniana) 3 yr after a September wildfire were evaluated for a site on the central coast of California. Data for 146 Coulter pine and 117 gray pine were analyzed with logistic regression models to estimate postfire survival in relationship to tree and fire-damage variables. Probability of survival for both species decreased with the increasing percentage of crown scorching and increasing height of bole bark char. Crown scorch was the most important variable for predicting survival of these species, but it was augmented by the bole-damage variable. Survival of gray pine was higher than that of Coulter pine for comparable values of both variables. West. J. Appl. For. 17(3):134–138.

Postfire Growth of Pseudotsuga menziesii and Pinus contorta in the Northern Rocky Mountains, USA

1991 ◽  
Vol 1 (1) ◽  
pp. 63 ◽  
Author(s):  
DL Peterson ◽  
MJ Arbaugh ◽  
GH Pollock ◽  
LJ Robinson
Keyword(s):  
Rocky Mountains ◽  
Pinus Contorta ◽  
Basal Area ◽  
Important Variable ◽  
Predictive Capability ◽  
Northern Rocky Mountains ◽  
Crown Volume ◽  
Crown Scorch ◽  
Survival And Growth ◽  
Significant Regression

Dendroecological methods were used to study the effects of wildfire on radial growth of Pseudotsuga mniiesii (Douglas-fir) and Pinus contorta (lodgepole pine) in the northern Rocky Mountains. Mean basal area increment during a 4-year postfire period declined relative to prefire growth in 75% of burned P. menziesii trees and 70% of P. contorta trees. Percent of crown volume scorched was the most important variable related to postfire growth of P. menziesii, while basal scorch was slightly more important than crown scorch to postfire growth of P. contorta. Postfire growth always declined when crown scorch exceeded 50% in P. menziesii and 30% in P. contorta. None of the significant regression models had high predictive capability because of the large amount of variance in the data. It is clear, however, that crown injury is critical to postfire survival and growth of P. menziesii, while basal injury is critical for the thin-barked species P. contorta.

scholarly journals Predicting postfire Douglas-fir beetle attacks and tree mortality in the northern Rocky Mountains

2007 ◽  
Vol 37 (6) ◽  
pp. 1058-1069 ◽  
Author(s):  
Sharon Hood ◽  
Barbara Bentz
Keyword(s):  
Tree Mortality ◽  
Stand Density ◽  
Douglas Fir ◽  
Dendroctonus Pseudotsugae ◽  
Northern Rocky Mountains ◽  
Crown Volume ◽  
Crown Scorch ◽  
Predicted Probability ◽  
Attack Trees ◽  
Stand Density Index

Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco) were monitored for 4 years following three wildfires. Logistic regression analyses were used to develop models predicting the probability of attack by Douglas-fir beetle ( Dendroctonus pseudotsugae Hopkins, 1905) and the probability of Douglas-fir mortality within 4 years following fire. Percent crown volume scorched (crown scorch), cambium injury, diameter at breast height (DBH), and stand density index for Douglas-fir were most important for predicting Douglas-fir beetle attacks. A nonlinear relationship between crown scorch and cambium injury was observed, suggesting that beetles did not preferentially attack trees with both maximum crown scorch and cambium injury, but rather at some intermediate level. Beetles were attracted to trees with high levels of crown scorch, but not cambium injury, 1 and 2 years following fire. Crown scorch, cambium injury, DBH, and presence/absence of beetle attack were the most important variables for predicting postfire Douglas-fir mortality. As DBH increased, the predicted probability of mortality decreased for unattacked trees but increased for attacked trees. Field sampling suggested that ocular estimates of bark char may not be a reliable predictor of cambium injury. Our results emphasize the important role of Douglas-fir beetle in tree mortality patterns following fire, and the models offer improved prediction of Douglas-fir mortality for use in areas with or without Douglas-fir beetle populations.

Development of post-fire crown damage mortality thresholds in ponderosa pine

2010 ◽  
Vol 19 (5) ◽  
pp. 583 ◽  
Author(s):  
James F. Fowler ◽  
Carolyn Hull Sieg ◽  
Joel McMillin ◽  
Kurt K. Allen ◽  
Jose F. Negrón ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Forest Management ◽  
Linear Regression ◽  
Linear Relationship ◽  
Ponderosa Pine ◽  
Regression Models ◽  
Intermountain West ◽  
Logistic Regression Models ◽  
Crown Scorch ◽  
Mortality Analysis

Previous research has shown that crown scorch volume and crown consumption volume are the major predictors of post-fire mortality in ponderosa pine. In this study, we use piecewise logistic regression models of crown scorch data from 6633 trees in five wildfires from the Intermountain West to locate a mortality threshold at 88% scorch by volume for trees with no crown consumption. For trees with >40% crown consumption volume, linear regression indicates >85% mortality, but for trees with crown consumption volume <40%, there is a statistically significant, linear relationship between increasing crown scorch and increasing probability of mortality. Analysis of an independent 600+ tree dataset from Colorado produced similar results and supports the analysis approach. Crown scorch volume (>85%), crown consumption volume (>40%), and crown consumption between 5 and 40% combined with crown scorch volume >50% mortality thresholds could be incorporated into post-fire marking guidelines for forest management goals.

Longevity and dynamics of fatally and nonfatally topped Douglas-fir in the Coast Range of Oregon

2009 ◽  
Vol 39 (11) ◽  
pp. 2224-2233 ◽  
Author(s):  
Tristan D. Huff ◽  
John D. Bailey
Keyword(s):  
Pseudotsuga Menziesii ◽  
Group Selection ◽  
Regression Models ◽  
Forest Ecosystems ◽  
Structural Heterogeneity ◽  
Douglas Fir ◽  
Coast Range ◽  
Logistic Regression Models ◽  
Explanatory Variables ◽  
Ground Slope

Worldwide, snags are an important, but often lacking, component of forest ecosystems. We revisited artificially topped Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco) trees 16–18 years after treatment in a replicated experiment in western Oregon. Some trees had been topped such that no live crown was retained (fatally topped), while others retained some portion of their live crown after topping (nonfatally topped). Topped trees were created under three different silvicultural regimes: clearcut, two story, and group selection. Twenty-three percent (61 of 262) of nonfatally topped trees remained living 16–18 years after treatment; 4% (19 of 482) of fatally topped trees had broken at some point up the bole by 16–18 years after treatment. Silvicultural regime, post-treatment height, stem diameter, stem lean, and ground slope were considered as potential explanatory variables in logistic regression models explaining mortality and breakage. A nonfatally topped tree’s odds of surviving 16–18 years after treatment was greater in the mature matrix of group selection stands than in clearcuts or two-story stands. A fatally topped tree’s odds of breaking within 16–18 years of treatment decreased as DBH increased. If carefully created, artificially topping trees can be a useful silvicultural tool to increase structural heterogeneity.

Crown scorch volume and scorch height: estimates of postfire tree condition

1985 ◽  
Vol 15 (3) ◽  
pp. 596-598 ◽  
Author(s):  
David L. Peterson
Keyword(s):  
Rocky Mountains ◽  
Tree Mortality ◽  
Conifer Species ◽  
Northern Rocky Mountains ◽  
Height Estimates ◽  
Crown Scorch ◽  
Crown Shape ◽  
Tree Condition

In salvage operations after wildfire, timber managers need to identify those trees most likely to die. Crown scorch volume and scorch height are commonly used to estimate damage to conifers after fire. Calculated crown scorch volume based on scorch height and tree dimensions was compared with observed crown scorch volume for four common conifer species of the northern Rocky Mountains. Calculated crown scorch volume was significantly greater than observed crown scorch volume for all species. The overestimates are the result of differences among species and trees of varying crown shape. When postfire tree condition was evaluated from observed crown scorch volume rather than from measured scorch height, crown damage was estimated with greater accuracy. Functions that estimate postfire tree mortality based on crown damage should be based on observed crown scorch volume rather than scorch height.

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