To explore the impact of forest fire on the emission mechanism of PM2.5, provide basic data and theoretical support for the study of PM2.5 emission from regional forest fire and the atmospheric environmental safety problems caused by PM2.5 emission from forest fire, so as to improve the understanding of the ecological and environmental effects of PM2.5 emission from forest fire.
In this study, the fuel on the surface of Pinus koraiensis plantation were used as experimental materials, and simulated combustion experiments were carried out with different fuel load, fuel moisture content and slope preset conditions. The effects of fire behaviors and preset conditions on water-soluble anions in PM2.5 were analyzed by single factor analysis of variance, multivariate analysis of variance, correlation analysis and redundancy analysis (db-RDA).
Fuel load significantly affects the contents of F-, Cl-, NO3-, and SO42-. The fuel moisture content significantly affects the content of NO3- and Cl-, but has no significant effect on the content of F- and SO42-. Slope has a significant effect on F- content and Cl- content, but has no significant effect on NO3- and SO42- content. Except humidity, other variables are positively correlated with the contents of F-, Cl-, NO3-, and SO42-. Fuel bed depth, flame length and flame height are positively correlated with NO3- content and Cl- content, while SO42- content is positively correlated with flame length and flame height, while combustion efficiency has relatively little influence on F-, Cl-, NO3-, and SO42- content. Further db-RDA analysis shows that the fire behavior characteristic that has the most significant influence on the contents of F-, Cl-, NO3-, and SO42- is the flame height.
There is a significant correlation between the characteristics of fire behavior and the emission of water-soluble ions in forest fire PM2.5, fuel load, fuel moisture content and slope can indirectly affect the content of water-soluble anions in PM2.5 by influencing fire behavior.
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