Vegetation impact on the thermal regimes of the active layer and near-surface permafrost in the Greater Hinggan Mountains, Northeastern China  

作　　者：XiaoLi Chang ShaoPeng Yu HuiJun Jin YanLin Zhang 

机构地区：[1]State Key Laboratory of Frozen Soils Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences [2]Department of Geography,Harbin College

出　　处：《Research in Cold and Arid Regions》2014年第5期511-520,共10页寒旱区科学（英文版）

基　　金：supported by the Open Fund of the State Key Laboratory of Frozen Soils Engineering (Grant No.SKLFSE200902,SKLFSE-ZT-14 and SKLFSE-ZT-12);National Natural Science Foundation of China (Grant Nos.41201066 and J0930003/ J0109)

摘　　要：The ground temperature and active layer are greatly influenced by vegetation in the Greater Hinggan Mountains in Northeastern China.However,vegetation,as a complex system,is difficult to separate the influence of its different components on the ground thermal regime.In this paper,four vegetation types,including a Larix dahurica-Ledum palustre var.dilatatum-Bryum forest（P1）,a L.dahurica-Betula fruticosa forest（P2）,a L.dahurica-Carex tato forest（P3） in the China Forest Ecological Research Network Station in Genhe,and a Carex tato swamp（P4） at the permafrost observation site in Yitulihe,have been selected to study and compare their seasonal and annual influence on the ground thermal regime.Results show that the vegetation insulates the ground resulting in a relatively high ground temperature variability in the Carex tato swamp where there are no tree stands and shrubs when compared with three forested vegetation types present in the area.Vegetation thickness,structure,and coverage are the most important factors that determine the insulating properties of the vegetation.In particular,the growth of ground cover,its water-holding capacity and ability to intercept snow exert a significant effect on the degree of insulation of the soil under the same vegetation.The ground temperature and active layer are greatly influenced by vegetation in the Greater Hinggan Mountains in Northeastern China.However,vegetation,as a complex system,is difficult to separate the influence of its different components on the ground thermal regime.In this paper,four vegetation types,including a Larix dahurica-Ledum palustre var.dilatatum-Bryum forest（P1）,a L.dahurica-Betula fruticosa forest（P2）,a L.dahurica-Carex tato forest（P3） in the China Forest Ecological Research Network Station in Genhe,and a Carex tato swamp（P4） at the permafrost observation site in Yitulihe,have been selected to study and compare their seasonal and annual influence on the ground thermal regime.Results show that the vegetation insulates the ground resulting in a relatively high ground temperature variability in the Carex tato swamp where there are no tree stands and shrubs when compared with three forested vegetation types present in the area.Vegetation thickness,structure,and coverage are the most important factors that determine the insulating properties of the vegetation.In particular,the growth of ground cover,its water-holding capacity and ability to intercept snow exert a significant effect on the degree of insulation of the soil under the same vegetation.

关 键 词：vegetation types PERMAFROST ground thermal regime Greater Hinggan Mountains 

分 类 号：P642.14[天文地球—工程地质学]