| The environmental problems caused by climate warming are becoming more and more prominent.The increase of carbon-containing gas emissions is the main reason for the greenhouse effect.The carbon-burning gas emitted by forest fires is second only to the burning of fossil fuels and is an important factor for global warming.In order to accurately estimate the carbon emissions of forest fires and quantitatively explore the impact of forest fires on climate warming,the skin,leaves and branches of 17 main trees in Daxing'anling were taken as research objects,and they were measured by indoor combustion test using Testo350 flue gas analyzer.The emissions of carbon-containing gases during the combustion process are analyzed for differences in emissions of different combustibles,and the emission factors,emission ratios,and corrected combustion efficiencies of the combustibles are calculated.The results showed that:(1)The average values of CO,CO2,CxHy and NO emissions in different parts of 17 trees(mg·dm-3)were:2483.28,17351.18,175.56,19.93,and leaves 2008.70,19889.36,187.05,58.59,branches 2266.25,17297.27,172.73,21.72.The average CO emission of skin,leaves and branches was>pig>leaf,and the difference was significant among the three;the average CO2 and CxHy emissions were leaf>skin>branches,which showed that the leaves were significantly higher than the skin and branches and the leaves and branches.The difference was not significant;the average value of NO gas emissions was>leaf>skin,and the difference between the three was significant.(2)Calculate the average value(g·kg-1)of the emission factors of CO,CO2,CxHy and NO emissions from 17 kinds of arbor,leaves and branches:the skin is 190.11±9.17,1326.66±71.92,13.45±1.49,1.52±0.13,leaves were 154.94±7.50,1526.93±72.30,14.41±1.44,4.52±0.33,and branches were 168.02±6.32,1282.17±53.66±12.82±1.30,1.61±0.11.The same kind of combustibles have the largest CO2 emission factor,and the relationship between the four gas emission factors satisfies EFCO2>EFCO>EFCxHy>EFNO.(3)Calculate the emission ratio of seed coat,leaf,branch CO,CxHy,NO to CO2 and the modified combustion efficiency of different combustibles in 17 trees.The CO emission ratio is significantly larger than that of other gases,and the correction of different combustibles The average value of combustion efficiency is leaf>branch>skin,and the MCE of skin,leaf and branch are 0.8742,0.9082 and 0.8835?respectively.(4)The average values of CO,CO2,CxHy and NO missions from the burning of six kinds of trees under the conditions of burning(smoldering)at 180? were calculated.Four kinds of combustibles were calculated at 180?.The emission factor of gas and the ratio of CO,CxHy,NO to CO2 emission and the modified combustion efficiency of different combustibles.The smoldering increases CO and CxHy emissions and emission factors relative to the light combustion,while the CO2,NO emissions and emission factors decrease.The combustibles have a reduced combustion efficiency during smoldering.(5)Regardless of smoldering or light burning,the MCE of the skin and leaves are coniferous trees<broad-leaved trees;the MCE branches of the coniferous trees during the light-burning>leaves,and the broad-leaved trees MCE branches<leaves;coniferous trees and broad The MCE of the leaves,leaves and branches of the same species of arbor in leaf smoldering did not show a uniform law.The research results will provide a theoretical basis for estimating the total carbon emissions of forest fires in Daxinganling and their impact on the environment. |
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