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《Ecological Science》 2010-03
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The effect of fire intensity on the natural rehabilitation of forest vegetation

LI Jing~1, SHI Juan~1, LUO You-qing~(1*), QI Peng~2, HELI(O|¨)VAARA Kari~3 1. Key Laboratory for Silviculture of Ministry of Education, Beijing Forestry University. Beijing 100083, China 2. Xing An Meng Forestry Bureau of Inner-Mongolia, Ulanhot 137400, China 3. Department of Forest Sciences, University of Helsinki, Helsinki FI-00014, Finland  
The fire caused by thunder in AerShan in 1998 has created forest patches in a damage gradient. Based on the orientation to the burned sites, forests were divided into centrally burned , marginally burned, underground fire and control forest. In addition, forests were divided into pure Larix gmelinii forests, pure Betula platyphylla forests and mixed forests of these two tree species. The plant species diversity, aboveground biomass and annual rings of trees and shrubs were evaluated from July to September 2008. We found that the provided classification standard could reflect the differences in vegetation rehabilitation status of forests after different fire intensities. Forests in centrally burned areas had the lowest plant richness, diversity and aboveground biomass. Underground fire areas showed rather low indices for these variables. In addition to the control stands, forests in marginally burned areas showed the highest investigated indices. Annual rings of trees and shrubs decreased with the increase of fire intensity. The mixed forests had a better resilience than the pure forests, and L. gmelinii showed a better resilience than B. platyphylla. Two herb species were chosen as representatives of heliophytes and sciophytes. By comparing the cover of these two herbs, the succession of vegetation was examined and found that the centrally burned forests are in the gap phase, the underground fire forests in building phase while the marginally burned forests in mature phase. Restorative measures to use following fires were developed. Further study was proposed for the relationship between the aboveground biomass of understory and forest primary production, the breadth and distribution of annual ring, as well as the arthropod community in forests.
【Fund】: 北京林业大学中务合作项目Biodiversity and Forest Pests Problem in Northeast China(BIOPROC1114201)
【CateGory Index】: S762.1
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