Abstract:

The release amounts and emission factors of CO₂, CO, C_xH_y, SO₂ and NO from the combustion of fifteen types of fuels in un-decomposed layer and semi-decomposed layer in Xiaoxing’an Mountain were determined by using the gas analysis system. We also analyzed the differences in the release amounts of fifteen types of fuels and the correlation of five gases from the combustion.The results showed that the factors of the five emitted gasses from fifteen types of fuels were respectively 3.16, 0.31, 0.007 0, 0.005 4, 0.019 0. The total content of the five gases was 1 330.56 mg·g^-1, the total content of carbon-containing gases was 1 321.245 mg·g^-1, the release content of CO₂ was 1 200.56 mg·g^-1. All the values emitted from the semi-decomposed layer were larger than that of un-decomposed layer. The released content of CO, C_x H_y, NO and SO₂ was respectively 118.02, 2.66, 2.06 and 8.21 mg·g^-1. All the values from the semi-decomposed layer were lower than that of the un-decomposed layer There were significant correlations with each other among the release contents of CO₂, CO, C_xH_y, and SO₂(P<0.001), but the release of NO was not significantly related with the release content of CO₂, CO, C_xH_y and SO₂ (P>0.05). This research result would provide some scientific basis for evaluating the effect of forest fires on the atmospheric environment and forest ground covers management.

Key words: forest fuel types, ground covers, emission factors, gas analysis