Effects of harvesting on the combustibility of surface fuels of Alnus hirsuta forest in discontinuous permafrost region

doi:10.13466/j.cnki.lczyyj.2025.06.011

Abstract

Abstract:

Amidst global warming and permafrost degradation,forest fire risk in the discontinuous permafrost region of the Greater Khingan Mountains has significantly increased.Fcosing on Alnus hirsuta forest,this study elucidatethe mechanism of different cutting intensities on the combustibility of surface fuels,providing a scientific basis for the sustainable management of forests in this region.Four harvesting intensity treatments were established:control(CK,unharvested),light selective cutting(LC,15%),heavy selective cutting(HC,45%),and clear-cutting(CC,100%).The water content,ignition point,and calorific value of surface fuels(shrubs,herbs,litter,and humus)were measured using the drying method,ignition method,oxygen bomb calorimeter.Linear regression analysis was employed to analyze the physicochemical properties of surface fuels and their interaction mechanisms.The results showed:1)Both the moisture content and ignition point of surface fuels exhibited a decreasingtrend with the escalating harvesting intensity,while the calorific value of displayed an upward trajectory.2)LC exerted no significant effect on the moisture content,ignition point,and calorific value of surface fuels in Alnus hirsuta forests.In contrast,HC and CC significantly reduced the moisture content and ignition point(P<0.05)while elevating the calorific value,thereby exacerbating the potential for forest fires.3)Under the four cutting intensity treatments,overall there was no significant correlation between the ignition point and calorific value of surface fuels,but exhibited a highly significant positive correlation between the ignition point and moisture content(P<0.01).No significant correlation was found between the calorific value of surface fuels and moisture content.In conclusion,the impacts on surface fuel combustibility vary across harvesting intensities in the discontinuous permafrost region of the Greater Khingan Mountains.LC is the optimal choice for sustainable forest management in this region as it ensures the rational utilization of forest resources while minimizing fire hazards.

Key words: discontinuous permafrost region, cutting, surface fuel, water content, ignition point, calorific value

CLC Number:

S762

YU Wennan, HAN Lidong, WO Xiaotang, ZHAO Chang. Effects of harvesting on the combustibility of surface fuels of Alnus hirsuta forest in discontinuous permafrost region[J]. Forest and Grassland Resources Research, 2025, (6): 111-120.

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类型	处理	鲜质量/g	干质量/g	采集数量/份
灌木	对照	191.58~209.32	90.91~108.02	15
	轻度择伐	190.02~209.68	79.43~ 89.31	15
	重度择伐	195.93~212.08	87.39~ 96.26	15
	皆伐	191.01~209.22	87.99~102.33	15
草本	对照	191.18~205.25	91.63~ 99.31	15
	轻度择伐	184.85~211.27	80.98~ 89.66	15
	重度择伐	186.63~208.25	87.73~ 98.08	15
	皆伐	181.39~209.51	89.90~105.08	15
枯落物	对照	192.28~207.22	106.81~117.51	15
	轻度择伐	180.01~215.12	88.51~102.78	15
	重度择伐	172.63~205.85	93.24~108.82	15
	皆伐	181.14~205.23	97.81~111.15	15
腐殖质	对照	195.31~209.78	103.27~117.18	15
	轻度择伐	176.78~202.62	81.76~ 95.64	15
	重度择伐	179.36~201.32	87.54~103.41	15
	皆伐	171.81~201.13	90.03~107.01	15