1. Home
  2. Items
  3. Predicting Mortality and Scorch Height from Prescribed Burning for Ponderosa...
PDF

Predicting Mortality and Scorch Height from Prescribed Burning for Ponderosa Pine in Northern Idaho Item Info

Planning the use of prescribed fire in ponderosa pine (Pinus ponderosa) communities often requires an estimate of tree mortality. A logistic regression model was developed to estimate survival of fire-injured ponderosa pine from prescribed burning. Scorch height and diameter at breast height estimate the probability of survival. Once a ponderosa pine exceeds 45 cm in diameter, it has a high probability of survival for the range of intensities within this study. Since the model is based on scorch height, Van Wagner's (1973) scorch height predictive equations were tested using data collected from 21 experimental fall fires. The range of data includes fire line intensities from 16 to 860 Kcal/sec/m, ambient air temperatures from 13 to 29?C, and average scorch heights from 1 to 17 m. Van Wagner's second equation, where scorch height is a function of fire line intensity and ambient air temperature, should be used to predict scorch height. Regression coefficients should be developed for different tree species. The regression coefficient for ponderosa pine developed in this study is lower than the average value of other tree species. Fire line intensity and ambient air temperature account for only 68% of the variability in scorch height for ponderosa pine in this study. Large fuels or heavy duff loadings that provide ventilation and heat for extended periods of time may help further explain the variability.

View on Timeline Download PDF
Title:
Predicting Mortality and Scorch Height from Prescribed Burning for Ponderosa Pine in Northern Idaho
Authors:
Saveland, James M. Bakken, Stephen R. Neuenschwander, Leon F.
Date Created:
1990-12-01
Description:
Planning the use of prescribed fire in ponderosa pine (Pinus ponderosa) communities often requires an estimate of tree mortality. A logistic regression model was developed to estimate survival of fire-injured ponderosa pine from prescribed burning. Scorch height and diameter at breast height estimate the probability of survival. Once a ponderosa pine exceeds 45 cm in diameter, it has a high probability of survival for the range of intensities within this study. Since the model is based on scorch height, Van Wagner's (1973) scorch height predictive equations were tested using data collected from 21 experimental fall fires. The range of data includes fire line intensities from 16 to 860 Kcal/sec/m, ambient air temperatures from 13 to 29?C, and average scorch heights from 1 to 17 m. Van Wagner's second equation, where scorch height is a function of fire line intensity and ambient air temperature, should be used to predict scorch height. Regression coefficients should be developed for different tree species. The regression coefficient for ponderosa pine developed in this study is lower than the average value of other tree species. Fire line intensity and ambient air temperature account for only 68% of the variability in scorch height for ponderosa pine in this study. Large fuels or heavy duff loadings that provide ventilation and heat for extended periods of time may help further explain the variability.
Relation:
Bulletin - Number 53, December 1990
Source:
Idaho SD12.I2 U47, University of Idaho Library Special Collections and Archives, http://www.lib.uidaho.edu/special-collections/
Type:
Text
Format:
application/pdf

Contact us about this record

Source
Preferred Citation:
"Predicting Mortality and Scorch Height from Prescribed Burning for Ponderosa Pine in Northern Idaho", Idaho Forest, Wildlife, and Range Experiment Station Collection, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/fwres/items/fwres185.html
Rights
Rights:
Educational use includes non-commercial use of text and images in materials for teaching and research purposes. Digital reproduction permissions granted by the University of Idaho Library. For other uses beyond free use, please contact University of Idaho Library Special Collections and Archives Department at libspec@uidaho.edu.
Standardized Rights:
http://rightsstatements.org/vocab/InC-EDU/1.0/
« Previous Back to Browse Next »