Allometric Equations of Crown Fuel Biomass and Analysis of Crown Bulk Density for Pinus densiflora
2010
Lee, B.D., Korea Forest Research Institute, Seoul, Republic of Korea | Won, M.S., Korea Forest Research Institute, Seoul, Republic of Korea | Kim, S.Y., Korea Forest Research Institute, Seoul, Republic of Korea | Yoon, S.H., Korea Forest Research Institute, Seoul, Republic of Korea | Lee, M.B., Korea Forest Research Institute, Seoul, Republic of Korea
To analyze the characteristics of canopy fuel in Pinus densiflora stand, which is essential to assess the crown fire hazard, allometric equations for estimation of crown fuel biomass were developed by subjectively categorized crown fuel component and crown bulk density was analyzed by available fuel component categories. Ten trees were destructively sampled at Pinus densiflora stand in Mt. Palgong in Daegu and their crown fuels were weighed separately for each fuel category by size classes and by living and dead. Regression equations that estimate crown fuel load by diameter at breast height(D) or additional total height(H) were derived. The adjusted coefficient of determination values were the highest (R²∧adj=0.835-0.996) and standard error of estimate were the lowest (SEE=0.074-0.638) in the allometric equation lnWt=α+βlnD+γlnH in average. However, in needles and small branches categories, the differences in R²∧adj and SEE between equations were not significant. Crown bulk density (CBD), which was calculated by crown fuel load divided by crown volume, was 0.067 kg/㎥ in average when only needles were considered as available crown fuel and 0.097 kg/㎥ when needles and branches (0-0.5 cm diameter) were considered. The increments of CBD of needles and small branches were little even when diameter at breast height increased.
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