Measurement considerations and trends in biomass heat storage of a mixed forest

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Abstract
Biomass heat storage is examined for a mixed forest in the summer of 1985 at the Petawawa National Forestry Institute, Chalk River, Ontario. The importance of including this term in the hourly energy balance is noted. Although biomass storage is small at night and around midday, it is a substantial contributor to the total canopy storage at times when net radiation is small. The measurement techniques involved in producing accurate estimates of biomass storage are also examined. Biomass estimates are best derived using individual species equations and summing the mass of every tree. Simplified methods using equations derived for all species and grouping trees into manageable diameter groups also produces reasonable results. Biomass temperature change is characterized by its lag in time of response in comparison to that of the air; using air temperature as a surrogate for biomass temperature is not recommended.

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