Effects of different heating times and humus particle sizes on vertical combustion of forest underground fire based on simulated spot burning
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摘要:
目的 森林地下火是一种缓慢、无焰、持续时间长的阴燃，对森林危害极大。大兴安岭地区是我国森林地下火频发区域，研究不同加热时间和腐殖质粒径对地下火垂直燃烧的影响，旨在为该地区森林地下火的预防、监测、扑救提供参考。 方法 以大兴安岭地区典型林型兴安落叶松林为研究对象，根据室内控制模拟点烧实验数据，使用SPSS进行双因素方差分析，Origin软件绘图，研究3种加热时间和5种腐殖质粒径对地下火垂直燃烧过程中蔓延速度和不同深度最高温度的影响。 结果 森林地下火垂直燃烧过程中，深度3 cm处燃烧最高温度只受加热时间的影响且差异显著（P < 0.05），而腐殖质粒径对其的影响则差异不显著（P > 0.05）；深度6 cm处的燃烧最高温度分别受加热时间（P < 0.05）和腐殖质粒径（P < 0.05）的影响；当深度大于6 cm后燃烧的最高温度则只受腐殖质粒径的影响并且差异显著（P < 0.05）。森林地下火垂直燃烧过程中的蔓延速度则只受腐殖质粒径的影响，不同腐殖质粒径之间的蔓延速度存在显著差异（P < 0.05）。 结论 森林地下火垂直燃烧3和6 cm处的最高温度随着加热时间的增加而升高，加热2 h时的燃烧温度最高；垂直燃烧深度9～21 cm时，腐殖质粒径40目的燃烧温度最高；不同腐殖质粒径对森林地下火垂直燃烧蔓延速度的影响中，腐殖质粒径20目的蔓延速度是最快的；腐殖质粒径60目时，是地下火燃烧过程中的临界，燃烧的最高温度和蔓延速度都较低。 Abstract:Objective The combustion of underground fire is a slow, flameless, long duration smoldering, which does great harm to forest. Daxing’anling region is a frequent area of forest underground fire in northeastern China. This paper aims to study the effects of different heating times and humus particle sizes on the vertical combustion of underground fires, aiming to provide a reference for the prevention, monitoring and suppression of underground fires in the area. Method Taking the typical forest type in the Daxing’an Mountains, i.e. Larix gmelinii forest as the research object, according to the indoor control simulation of scorching experiment data, SPSS was used to perform two-factor analysis of variance, and the Origin software was used to draw. The effects of three heating times and five humus particle sizes on the spreading speed and the highest temperature at different depths during the vertical combustion of underground fire were studied. Result During the vertical burning process of the forest underground fire, the temperature of the highest burning at a depth of 3 cm was only affected by the heating time and the difference was significant (P < 0.05), but the effects of humus particle size on the difference were not significant (P > 0.05). The highest temperature of combustion at a depth of 6 cm was affected by the heating time (P < 0.05) and the particle size of humus (P < 0.05). When the depth was greater than 6 cm, the maximum combustion temperature was only affected by the humus particle size and the difference was significant (P < 0.05). The spread rate during the vertical combustion of forest underground fires was only affected by the humus particle size. There were significant differences between the spreading speeds (P < 0.05). Conclusion The highest temperature of underground forest fires burning at 3 cm and 6 cm depth rises with the increase of heating time, and the burning temperature is the highest when heated for 2 h. When the vertical combustion depth is 9−21 cm, the humus particle size is 40 mesh, the burning temperature is the highest. Among the effects of humus particle size on the spread speed of forest underground fires, the spread speed of humus particle size 20 mesh is the fastest; when the humus particle size is 60 mesh, it is the criticality in the process of underground fire combustion. The highest combustion temperature and spread speed are lower. -
图 1 不同加热时间和腐殖质粒径下地下火垂直燃烧不同深度最高温度的多重比较
各图数据条上相同的字母表明二者之间差异不显著（P > 0.05）。下同。 Same letters on the data bars of each figure proves that difference between the two is not significant (P > 0.05). The same below.
Figure 1. Multiple comparisons of the highest temperature of vertical combustion of underground fires at different heating times and humus particle sizes
图 2 不同腐殖质粒径下地下火垂直燃烧蔓延速度的多重比较
Figure 2. Multiple comparison of vertical combustion spreading velocity of underground fire under different humus particle sizes
表 1 样地基本信息
Table 1. Basic information of sample plots
样地
Sample plot经纬度
Longitude and latitude海拔
Altitude/m郁闭度
Canopy density林龄/a
Forest age/year腐殖质层厚度
Humus thickness/cm样地1 Sample plot 1 50°18′23″N 124°05′27″E 392.9 0.8 27 31 样地2 Sample plot 2 50°17′56″N 124°05′17″E 407.2 0.7 30 34 样地3 Sample plot 3 50°17′50″N 124°53′56″E 422.6 0.8 27 36 
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表 2 不同加热时间和腐殖质粒径对不同深度最高温度影响的方差检验
Table 2. Variance test of the effects of different heating times and humus particle sizes on thehighest temperature at different depths
距离 Distance 指标 Index F P D1 腐殖质粒径 Humus particle size 1.855 0.171 加热时间 Heating time 22.984 0.000 腐殖质粒径 × 加热时间 Humus particle size × heating time 0.535 0.813 D2 腐殖质粒径 Humus particle size 3.896 0.023 加热时间 Heating time 6.950 0.007 腐殖质粒径 × 加热时间 Humus particle size × heating time 0.292 0.958 D3 腐殖质粒径 Humus particle size 4.846 0.010 加热时间 Heating time 3.402 0.060 腐殖质粒径 × 加热时间 Humus particle size × heating time 0.490 0.845 D4 腐殖质粒径 Humus particle size 4.109 0.019 加热时间 Heating time 1.720 0.213 腐殖质粒径 × 加热时间 Humus particle size × heating time 0.523 0.821 D5 腐殖质粒径 Humus particle size 4.895 0.010 加热时间 Heating time 1.136 0.347 腐殖质粒径 × 加热时间 Humus particle size × heating time 0.379 0.915 D6 腐殖质粒径 Humus particle size 4.665 0.012 加热时间 Heating time 0.759 0.486 腐殖质粒径 × 加热时间 Humus particle size × heating time 0.326 0.943 D7 腐殖质粒径 Humus particle size 5.355 0.007 加热时间 Heating time 0.615 0.554 腐殖质粒径 × 加热时间 Humus particle size × heating time 0.430 0.885 注：D1 ~ D7表示地下火垂直燃烧深度，分别为3、6、9、12、15、18、21 cm。下同。Notes: D1−D7 indicate the vertical combustion depth of underground fire, which are 3, 6, 9, 12, 15, 18, 21 cm. The same below.
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表 3 不同加热时间和腐殖质粒径对蔓延速度影响的方差检验
Table 3. Variance test of the impact of different heating times and particle sizes on spreading rate
指标 Index F P 腐殖质粒径 Humus particle size 7.624 0.001 加热时间 Heating time 2.300 0.134 腐殖质粒径 × 加热时间
Humus particle size × heating time0.835 0.586
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[1] Samira O, Laure P, Hugo A, et al. Burning potential of fire refuges in the boreal mixedwood forest[J]. Forests, 2016, 7(12): 2−17. [2] Suresh B K V, Roy A, Prasad P R. Forest fire risk modeling in Uttarakhand Himalaya using TERRA satellite datasets[J]. European Journal of Remote Sensing, 2016, 49: 389−395. [3] Turetsky M R, Benscoter B, Page S, et al. Global vulnerability of peatlands to fire and carbon loss[J]. Nature Geoscience, 2014, 8(1): 11−14. [4] Rein G, Cleaver N, Ashton C, et al. The severity of smouldering peat fires and damage to the forest soil[J]. Catena, 2008, 74(3): 304−309. doi: 10.1016/j.catena.2008.05.008 [5] Davies G M, Gray A, Rein G, et al. Peat consumption and carbon loss due to smouldering wildfire in a temperate peatland[J]. Forest Ecology and Management, 2013, 308(7): 169−177. [6] Huang X Y, Rein G. Upward-and-downward spread of smoldering peat fire[J]. Proceedings of the Combustion Institute, 2018, 21: 9−17. [7] Reardon J, Hungerford R, Ryan K. Factors affecting sustained smouldering in organic soils from pocosin and pond pine woodland wetlands[J]. International Journal of Wildland Fire, 2007, 16(1): 107−118. doi: 10.1071/WF06005 [8] 唐抒圆, 李华, 单延龙, 等. 森林地下火特征及防控措施[J]. 世界林业研究, 2019, 32(3):42−48.Tang S Y, Li H, Shan Y L, et al. Characteristics and control of underground forest fire[J]. World Forestry Research, 2019, 32(3): 42−48. [9] 何诚, 舒立福, 张思玉, 等. 大兴安岭森林草原地下火阴燃特征研究[J]. 西南林业大学学报(自然科学), 2020, 40(2):103−110.He C, Shu L F, Zhang S Y, et al. Research on underground fire smouldering characteristics of forest steppe in Great Xing’an Mountains in Heilongjiang Province[J]. Journal of Southwest Forestry University (Natural Sciences), 2020, 40(2): 103−110. [10] 尹赛男, 单延龙, 宋光辉, 等. 不同粒径腐殖质火垂直燃烧特征研究[J]. 中南林业科技大学学报, 2019, 39(10):95−101.Yin S N, Shan Y L, Song G H, et al. Study on vertical combustion characteristics of humus fire under different particle sizes[J]. Journal of Central South University of Forestry & Technology, 2019, 39(10): 95−101. [11] 辛颖, 王新然, 李禹洁. 森林腐殖质阴燃向明火转变实验研究[J]. 消防科学与技术, 2018, 37(9):1162−1166. doi: 10.3969/j.issn.1009-0029.2018.09.002Xin Y, Wang X R, Li Y J. Experimental study on the transition of forest humus from smoldering to open flame[J]. Fire Science and Technology, 2018, 37(9): 1162−1166. doi: 10.3969/j.issn.1009-0029.2018.09.002 [12] Anderson J A R. Observations on climatic damage in peat swamp forest in Sarawak[J]. Commonwealth Forestry Review, 1964, 43(2): 145−158. [13] 舒立福, 王明玉, 田晓瑞, 等. 大兴安岭林区地下火形成火环境研究[J]. 自然灾害学报, 2003, 12(4):62−67. doi: 10.3969/j.issn.1004-4574.2003.04.011Shu L F, Wang M Y, Tian X R, et al. Fire environment mechanism of ground fire formation in Daxing’an Mountains[J]. Journal of Natural Dusasters, 2003, 12(4): 62−67. doi: 10.3969/j.issn.1004-4574.2003.04.011 [14] Hadden R M, Rein G, Belcher C M. Study of the competing chemical reactions in the initiation and spread of smouldering combustion in peat[J]. Proceedings of the Combustion Institute, 2013, 34(2): 2547−2553. doi: 10.1016/j.proci.2012.05.060 [15] 单延龙. 大兴安岭森林可燃物的研究[D]. 哈尔滨: 东北林业大学, 2003.Shan Y L. Study on froest fuel of Daxing’an Mountains in northeast China[D]. Harbin: Northeast Forestry University, 2003. [16] 张运林, 孙萍, 胡海清, 等. 风速对蒙古栎阔叶床层两个重要失水时间的影响[J]. 中南林业科技大学学报, 2018, 38(4):65−71.Zhang Y L, Sun P, Hu H Q, et al. Effects of wind speed on two key drying times of fuel beds composed of Mongolian oak leaves[J]. Journal of Central South University of Forestry & Technology, 2018, 38(4): 65−71. [17] 张恒, 金森, 张运林, 等. 气象法预测盘古林场可燃物含水率的外推精度[J]. 中南林业科技大学学报, 2016, 36(12):61−67.Zhang H, Jin S, Zhang Y L, et al. Meteorological elements regression method is used to predict Pangu Forest Farm extrapolation accuracy analysis of fuel moisture content[J]. Journal of Central South University of Forestry & Technology, 2016, 36(12): 61−67. [18] 满子源, 胡海清, 张运林, 等. 帽儿山地区典型地表可燃物含水率动态变化及预测模型[J]. 北京林业大学学报, 2019, 41(3):49−57.Man Z Y, Hu H Q, Zhang Y L, et al. Dynamic change and prediction model of moisture content of surface fuel in Maoer Mountain of northeastern China[J]. Journal of Beijing Forestry University, 2019, 41(3): 49−57. [19] 孙向阳. 土壤学[M]. 北京: 中国林业出版社, 2010.Sun X Y. Soil science[M]. Beijing: China Forestry Publishing House, 2010. [20] 张吉利, 邸雪颖. 地下火及阴燃研究进展[J]. 温带林业研究, 2018, 1(3):19−22. doi: 10.3969/j.issn.2096-4900.2018.03.004Zhang J L, Di X Y. The study of ground fire and smoldering: a review[J]. Journal of Temperate Forestry Research, 2018, 1(3): 19−22. doi: 10.3969/j.issn.2096-4900.2018.03.004 [21] 辛颖, 历美岑. 粒径对森林腐殖质阴燃传播的影响[J]. 消防科学与技术, 2017, 36(8):1037−1040. doi: 10.3969/j.issn.1009-0029.2017.08.001Xin Y, Li M C. The influence of particle size on smoldering combustion of forest humus[J]. Fire Science and Technology, 2017, 36(8): 1037−1040. doi: 10.3969/j.issn.1009-0029.2017.08.001 [22] 者香, 赵伟涛, 陈海翔, 等. 泥炭粒径对阴燃蔓延速率影响的实验研究[J]. 火灾科学, 2014, 23(3):129−135. doi: 10.3969/j.issn.1004-5309.2014.03.01Zhe X, Zhao W T, Chen H X, et al. Influence of particle size on the spreading rate of peat smoldering: an experimental study[J]. Fire Safety Science, 2014, 23(3): 129−135. doi: 10.3969/j.issn.1004-5309.2014.03.01 [23] He F, Yi W, Li Y, et al. Effects of fuel properties on the natural downward smoldering of piled biomass powder: experimental investigation[J]. Biomass and Bioenergy, 2014, 67: 288−296. doi: 10.1016/j.biombioe.2014.05.003 [24] 李小川, 李兴伟, 王振师, 等. 广东森林火灾的火源特点分析[J]. 中南林业科技大学学报, 2008, 28(1):89−92. doi: 10.3969/j.issn.1673-923X.2008.01.025Li X C, Li X W, Wang Z S, et al. Analysis of fire source characteristics of Guangdong forest fires[J]. Journal of Central South University of Forestry & Technology, 2008, 28(1): 89−92. doi: 10.3969/j.issn.1673-923X.2008.01.025 [25] Ohlemiller T J. Modeling of smoldering combustion propagation[J]. Progress in Energy & Combustion Science, 1985, 11(4): 277−310. [26] 者香. 泥炭粒径、含水率和无机物含量对阴燃蔓延速率影响的实验研究[D]. 合肥: 中国科学技术大学, 2015.Zhe X. Experimental study on the influence of particle size, moisture content and mineral content on the spreading rate of peat smoldering[D]. Hefei: University of Science and Technology of China, 2015. -
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