首页|Influences of forest fires on the permafrost environment:A review

Influences of forest fires on the permafrost environment:A review

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In boreal and arctic regions,forest fires exert great influences on biogeochemical processes,hydrothermal dynamics of the active layer and near-surface permafrost,and subsequent nutrient cycles.In this article,the studies on impacts of forest fires on the permafrost environment are reviewed.These studies indicate that forest fires could result in an irreversible degradation of permafrost,successions of boreal forests,rapid losses of soil carbon stock,and increased hazardous periglacial landforms.After forest fires,soil temperatures rise;active layer thickens;the release of soil carbon and nitrogen enhances,and;vegetation changes from coniferous forests to broad-leaved forests,shrublands or grasslands.It may take decades or even centuries for the fire-disturbed ecosystems and permafrost environment to return to pre-fire conditions,if ever possible.In boreal forest,the thickness of organic layer has a key influence on changes in permafrost and vegetation.In addition,climate warming,change of vegetation,shortening of fire return intervals,and extent of fire range and increasing of fire severity may all modify the change trajectory of the fire-impacted permafrost environment.However,the observations and research on the relationships and interactive mechanisms among the forest fires,vegetation,carbon cycle and permafrost under a changing climate are still inadequate for a systematic impact evaluation.Using the chronosequence approach of evaluating the temporal changes by measuring changes in the permafrost environment at different stages at various sites(possibly representing varied stages of permafrost degradation and modes),multi-source data assimilation and model predictions and simulations should be integrated with the results from long-and short-term field investigations,geophysical investigations and airborne surveys,laboratory testing and remote sensing.Future studies may enable quantitatively assess and predict the feed-back rela-tionship and influence mechanism among organic layer,permafrost and active layer processes,vegetation and soil carbon under a warming climate at desired spatial and temporal scales.The irreversible changes in the boreal and artic forest ecosystem and their ecological and hy-drothermal thresholds,such as those induced by forest fires,should be better and systematically studied.

Forest firesHydrothermal processesOrganic layer thicknessActive layer thicknessEcological thresholdsPermafrost degradationBoreal and arctic regions

LI Xiao-Ying、JIN Hui-Jun、WANG Hong-Wei、Sergey S.MARCHENKO、SHAN Wei、LUO Dong-Liang、HE Rui-Xia、Valentin SPEKTOR、HUANG Ya-Dong、LI Xin-Yu、JIA Ning

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Key Laboratory of Sustainable Forest Ecosystem Management(Ministry of Education),College of Forestry,Northeast Forestry University,Harbin,150040,China

Northeast-China Observatory and Research Station of Permafrost Geological Environment(Ministry of Education),School of Civil Engineering,Institute of Cold Region Science and Engineering,Northeast Forestry University,Harbin,150040,China

State Key Laboratory of Frozen Soils Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,730000,China

Permafrost Lab,Geophysical Institute,University of Alaska Fairbanks,Fairbanks,99775,USA

Melnikov Permafrost Institute,Siberian Branch,Russian Academy of Sciences,Yakutsk,677010,Russia

School of Civil Engineering,Harbin Institute of Technology,Harbin,150090,China

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This work was financially supported by the Natural Science Foundation of China ProgramStartup Research Funding of Northeast Forest University for Chengdong Leadershipand Outstanding Young ScholarNatural Science Foundation of China ProgramJoint Key Program of National Natural Science Foundation of China(NSFC)-Heilongjiang Province Joint Foundation for Regional DeveState Key Laboratory of Frozen Soils Engineering Open Fund Projectand Russian Foundation for Basic Research

42001052LJ2020-01YQ2020-1041871052U20A2082SKLFSE20181118-05-00990

2021

气候变化研究进展(英文版)
国家气候中心

气候变化研究进展(英文版)

CSCDSCI
影响因子：0.806
ISSN：1674-9278
年,卷(期)：2021.12(1)
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