Analysis Of Gas Emission Capacity Of Main Arbor And Bush Fuel Types Of Hei Longjiang Province

This article has taken the Daxing'anling and Liangshui Forest Farm of Xiaoxing'anling in Heilongjiang Province as research area,by the method of wild investigation and laboratory control condition burning experiments,measured and computed emission factors and emission quantity of CO₂,CO,CxHy,NO and SO₂ within 22 kinds of arbor and 24 kinds of shrub in different burning stage,then from the perspective of release speed have analyzed the burning characteristics of different forest fuels,main content and results are as below: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 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).The sequence of CO₂ emission average was shrub＞arbor,the difference was prominent;the sequence of CO emission average is arbor＞shrub,the difference was not prominent between arbor and shrub;the sequences of CxHy,NO,SO₂ emission average were shrub＞arbor,the differences were also not prominent. CO₂ emission of shrub was larger than arbor,the duration of sufficient combustion process was long,flaming stage proportion was larger,and the burning characteristics was obvious.From the analysis of different kinds of gas emission characteristic,CO emission obviously increases while burning insufficiently;CO emission curve was bimodal in shape,the peak value of the first peak was obviously greater than the second peak,emission time was longer than other gases notably;CO also taked the shortest time to reach the release peak and CO₂ taked the longest time to reach the peak.CO bimodal emission curve was a very favorable identification of preheating,decomposing,flaming and smoldering during burning.CO₂ emission factor was greater than other gases obviously within five kinds of gas.CO₂, CO,CxHy,NO and SO₂ emission factors of arbor and shrub were 2.6942,0.5732,0.0262, 0.0076,0.0117;2.7818,0.4134,0.0217,0.0095,0.0120,respectively.CO₂,CO,CxHy,NO and SO2 emission quantity of 5g sample of arbor and shrub were 5899.37mg,1349.76mg,74.80mg, 19.85mg,33.58mg;6074.89mg,1255.99mg,63.30mg,26.80mg,38.46mg,respectively.By the method of LSD(P＜0.05),the differences of CO₂,CO and SO₂ emission quantity were not prominent;There was an opposite pattern of the mean emissions of CxHy and NO.We measured burning process gas emission of different places in three kinds of arbor(Phellodend onamurense,Fraxinus mandshurica,Juglans mandshurica).Also used the Lowest Significance Difference(LSD) method to measure the gas emission difference between different species and different parts.The result showed that there was a significant difference of CO₂,CO,CxHy,NO and SO₂ emission capacity,carbon containing gas content and five kinds of gas total content between different 3 species and parts.Phellodend onamurense had a a significant difference between CO₂,CO,SO₂,carbon containing gas content and five kinds of gas total content,while the difference of CxHy and NO emission capacity was not not prominent;the difference of CO,CxHy and NO emission capacity for Fraxinus mandshurica was prominent,while CO₂,SO₂,carbon containing gas content and five kinds of gas total content was opposite;the difference of CO and NO emission capacity for Juglans mandshurica was prominent,while CO₂,CxHy,SO₂,carbon containing gas content and five kinds of gas total content was opposite.The difference of CO,CxHy,NO,SO₂ emission capacity for bark and bole between 3 kinds of arbor was prominent,while CO₂,carbon containing gas content and five kinds of gas total content was not;the difference of CO and NO emission capacity for branch between 3 spieces was not prominent.The results of the research will provide basal data and academic base for researching of gas emission from forest fuels burning.