[Pyrolysis and gas emissions characteristics of six tree species in Heilongjiang Province, China].

Forest fuels are the basis of fire occurrences, while ground dead fuels are an important part of forest fuels. Undestanding the pyrolysis characteristics and gas emissions of forest fuels is of great significance to explore the effects of forest fire on atmospheric environment and carbon balance, as well as to prevent and combat forest fire. In this study, the thermogravimetric analysis and gas emission analysis were conducted on leaf litter of six tree species ( var. , , , , , ) in Heilongjiang Province to explore the pyrolysis process and combustibility of forest fuels, to analyze their pyrolysis characteristics, pyrolysis kinetics characteristics, gas emission characteristics. A four-dimensional evaluation of their combustibility was conducted based on pyrolysis parameters. The results showed that the pyrolysis temperature of holocellulose in the leaves of those six tree species ranged in 143.31-180.48 ℃ at the beginning and 345.04-394.38 ℃ at the end, lignin pyrolysis temperature ranged in 345.04-394.38 ℃ at the beginning and 582.85-609.31 ℃ at the end. The pyrolysis of the six kinds of arbor blades during the pyrolysis process affected fuel ash content, quality and temperature of the total pyrolysis. The activation energies of two main pyrolysis stages of leaves of six tree species were 18.88-27.08 kJ·mol and 13.25-27.54 kJ·mol, respectively, and the pre-exponential factors were 3.13-26.28 min and 1.30-22.55 min. The holocellulose activation energy and pre-exponential factor of the pyrolysis stage for , , , and were greater than that of the lignin pyrolysis stage, while the opposite was true for var. and . The release amounts of CO and CO at the pyrolysis stage of the holocellulose was 535.16-880.11 mg·m and 7004.97-10302.05 mg·m, and that at the pyrolysis stage of lignin was 240.31-1104.67 mg·m and 20425.60-33946.68 mg·m, respectively. The release of CO and CO at the pyrolysis stage of healdellulose was less, but mass loss was greater than that at the pyrolysis stage of lignin. In the four-dimensional combustibility ranking of the six tree species leaves, was the best ignitable, was the most combustible, and var. was the most sustainable and consumable. The ignitability was significantly positively correlated with pyrolysis kinetics parameters of the holocellulose, while the sustainability was negatively correlated with that of lignin.