Analysis Of Gas Emission Of Main Forest Types Ground Covers Combustion In Hei Longjiang Province

By the method of wild investigation and laboratory control condition combustion experiments, measured and computed emission factors and emission capacity of CO₂,CO,C_xH_y. NO and SO₂ of semi-decomposed and un-decomposed ground covers burning from the main forest types in Da xinganling and Xiao xinganling Hei longjiang Province. Analyzed the difference of combustion properties of the different forest fuels by gas emission capacity. The difference of gas emission between different types of forest fuel was tested by the method of Lowest Significance Difference (LSD).The result showed that, The result showed that CO₂ was the dominating gas released during the fuel burning process, the difference of gas emission between different types of forest fuel was prominent (P<0.05), but the difference from different gas emission was distinctness.The analysis of gas emission properties of ground covers combustion from different forest types showed that: CO₂ was dominant during the process of combustion with gas emission. While insufficient combustion condition, CO emission capacity increased obviously, the CO emission curve was a double summit figure. The shortest time which took was CO while it appeared the largest value in burning process, and the longest time which took was CO₂. Emission factors of CO₂,CO,C_xH_y,NO,SO₂ mean value was 3.159,0.311,0.007,0.005,0.019 in Da xinganling. Gas emission of different forest types ground covers combustion in the same air quality unit had little difference. Emission capacity of CO₂,CO,C_xH_y,NO,SO₂ mean value was 1001.70 mg·g^-1,233.80 mg·g^-1,4.10mg·g^-1,7.77 mg·g^-1,8.10 mg·g^-1 in Da xinganling area. Emission capacity of CO₂,CO,C_xH_y,NO,SO₂ mean value was 1200.56 mg·g^-1,118.02 mg·g^-1,2.66 mg·g^-1,2.06 mg·g^-1,8.21 mg·g^-1 in Xiao xinganling area.Compared gas emission capacity of forest fuel combustion from 5 different forest types (Betula platyphylly forest, Larix gmelinii forest, Quercus mongolica forest,Populus davidiana forest, Pinus sylvestris var. mongolica forest) between Da xinganling and Xiao xinganling. Gas emission capacity, gas release and emission factors of different areas and decomposed layers were tested by the method of Lowest Significance Difference (LSD). The result showed that: mean value of gas emission, emission factors and gas release of CO₂,CO,C_xH_y,NO,SO₂ had significant variation (P<0.05) in 5 kinds of forest types, but the difference was unequal. Gas emission of 5 kinds of gas from Pinus sylvestris var. mongolica forest semi-decomposedlayer was significantly different (P<0.05) between Da xinganling area and Xiao xinganling area. Emission factors of five gas that was respective from Betula platyphylly forest un-decomposed layer, Quercus mongolica forest and Populus davidiana forest semi- decomposed layer, Pinus sylvestris var. mongolica forest un-decomposed layer and semi-decomposedlayer had significant difference(P<0.05). The results of the research will provide basal data and academic base for researching of gas emission from forest fuels burning.