红松人工林地表可燃物燃烧释放颗粒物质量及影响因素

doi:10.11707/j.1001-7488.20220311

Abstract

Abstract:

Objective: Based on the indoor burning experiment carried out in the combustion wind tunnel laboratory, the particle size distribution and variation characteristics of the particulate matter released by surface fuel combustion in Korean pine plantation were quantitatively revealed, which would provide reference for the particulate matter released by forest fire. Method: The Korean pine plantation in the eastern mountainous area of Northeast China was selected as the object, and the fuel bed with different wind speed, fuel load and fuel moisture content was constructed. Based on 108 ignition experiments in the combustion wind tunnel laboratory, real-time monitoring was carried out by using the dissolved aerosol monitor (TSI Dust Trak 8533, USA), and random forest algorithm was used to establish a prediction model for particles of different sizes. Result: Wind speed was one of the most important factors affecting the mass of the four particle matter sizes. PM₁ was most affected by wind speed (37.207%) and temperature (25.651%), and was least affected by fuel moisture content (8.304%); PM_2.5 was most affected by wind speed (43.293%) and fuel load (22.855%), and was least affected by combustion efficiency (7.509%); PM₄ was the most affected by wind speed (43.552%) and fuel load (21.225%), and was least affected by fuel moisture content (6.841%); PM₁₀ was most affected by wind speed (40.832%) and fuel load (23.337%), and was least affected by fuel moisture content (6.946%). The R² of prediction models for PM₁、PM_2.5、PM₄、PM₁₀ based on the random forest algorithm were 0.804, 0.810, 0.806 and 0.812, respectively. Conclusion: The mass of particulate matter is positively correlated with wind speed, fuel load, fuel moisture content, and combustion efficiency (>80%), and negatively correlated with temperature and relative humidity. In general, the random forest algorithm can be used to better analyze the complex relationships between various variables and the mass of particulate matter. The observed range of particulate matter released from surface fuel combustion in Korean pine plantation is 1.72-56.04 g, and the predicted range is 5.67-36.33 g, which provides a data basis for the establishment of pollution source emission inventories and occupational exposure standards for fire-fighting practitioners.

Key words: Korean pine plantation, combustion, particulates, wind speed, random forest

CLC Number:

ST18.5
S762

Xinyuan Liu,Guang Yang,Jibin Ning,Daotong Geng,Hongzhou Yu,Xueying Di. Quality and Influencing Factors of Particulate Matter Released by Surface Fuel Combustion in Korean Pine Plantation[J]. Scientia Silvae Sinicae, 2022, 58(3): 97-106.

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样地编号 Sample No.	平均胸径 Mean DBH /cm	平均树高 Average height/m	林龄 Forest age/a	造林密度 Planting density	郁闭度 Canopy density	可燃物载量 Fuel load/(t·hm^-2)
样地编号 Sample No.	平均胸径 Mean DBH /cm	平均树高 Average height/m	林龄 Forest age/a	造林密度 Planting density	郁闭度 Canopy density	平均值 Average	A	B	C	D	E
1	22.7±0.48	20.3±0.78	44	2m×2m	0.6	3.4	4.5	3.3	3.2	2.1	3.9
2	26.9±0.56	24.3±0.51	44	2m×2m	0.8	6.3	8.1	5.6	4.3	3.5	10.0
3	18.2±0.12	13.7±0.06	44	2m×2m	0.7	6.8	5.4	10.2	6.6	6.9	4.9

模型变量 Vari ables of model	最小值 Min	最大值 Max	均值±标准误差 Mean SE	百分位数Percentile
模型变量 Vari ables of model	最小值 Min	最大值 Max	均值±标准误差 Mean SE	25%	50%	75%
温度Temperature /℃	5.10	17.60	12.18±0.32	9.55	15.07	17.60
相对湿度Relativehumidity (%)	32.00	94.10	66.31±1.65	54.13	81.58	94.10
风速Wind speed /(m·s^-1)	0.00	3.00	1.50±0.11	0.25	2.75	3.00
预设含水率Preset moisture content (%)	5.00	15.00	9.95±0.38	5.00	10.00	15.00
实际含水率Actual moisture content (%)	2.60	15.38	9.41±0.39	5.02	14.03	15.37
可燃物载量Fuel load /(t·hm^-2)	6.00	10.00	8.00±0.16	6.00	8.00	10.00
燃烧效率Combustion efficiency(%)	33.19	99.27	85.32±0.72	82.99	89.33	99.27
PM₁质量PM₁ mass/g	1.72	55.45	16.63±1.07	8.25	13.68	22.07
PM_2.5质量PM_2.5 mass /g	1.73	55.96	16.78±1.08	8.35	13.78	22.36
PM₄质量PM₄mass/g	1.73	56.00	16.82±1.08	8.38	13.81	22.55
PM₁₀质量PM₁₀ mass /g	1.79	56.04	16.91±1.08	8.49	13.98	22.63

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Quality and Influencing Factors of Particulate Matter Released by Surface Fuel Combustion in Korean Pine Plantation

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