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《Chinese Journal of Ecology》 2015-02
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Dynamics of recovery process of understory vegetation of Betula platyphylla- Larix gmelinii forest in Daxing'an Mountains after fire disturbance

HAN Feng-lin;BU Ren-cang;CHANG Yu;HU Yuan-man;MA Jun;NIE Zhi-wen;State Key Laboratory of Forest and Soil Ecology,Institute of Applied Ecology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Forest fire plays a vital role in the succession of forest ecosystems,and determines species composition,structure stability and species diversity in the forest ecosystems. In this study,we investigated the understory vegetation of Larix gmelinii- Betula platyphylla forests in Daxing'anling Mountains,and analyzed the recovery process of burned areas with the method of spatial pattern instead of time series. The results showed that the community composition changed from xerophytes to mesophytes and hygrophytes in the shrub and herb layers,while species diversity did not show an increasing trend with the community succession. In the herb layer,species richness index showed an increasing trend at beginning and then decreased after 5- 8 years on the burned areas. Similarly,species diversity index reached the maximum value 5 years after the fire and tended to be relatively stable value 20 years after. Species evenness index reached its lowest value about 5 years after the fire,then presented an increase and then tended to be stable finally. The temporal trend of species diversity index in the shrub layer was similar to that of herbaceous species but there was a lag of 3- 5 years. Understory biomass increased exponentially with restoration age,reaching 10. 5 t·hm- 2at 25 years after the fire.
【Fund】: 国家重点基础研究发展计划项目(2013CBA01807);; 先导专项(XDA05050200);; 国家自然科学基金项目(41371198)资助
【CateGory Index】: S718.5
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