RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2022, Vol. 31 >> Issue (12): 2662-2671.doi: 10.11870/cjlyzyyhj202212010

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Dominant Population Structure in Secondary Succession Stage of Degraded Artificial Picea Asperata Forest of Shatan Forest Farm #br# Located in Bailongjiang Forest Region, Gansu Province

ZHAO Yang1,2,LI Bo1,2, LIU Ting 1,2, QI Rui1,2, WANG fei1,2, CAO Xiu-wen1,2, LIU Jin-qian1,2   

  1. (1. Institute of Forestry Science of Bailongjiang in Gansu Province, Lanzhou 730046, China;2. GanSu Bailongjiang National Forest Ecosystem Resear ch Station, Zhouqu 746300, China)
  • Online:2022-12-20 Published:2023-01-13

Abstract: The population dynamic of secondary succession stage of degraded artificial Picea asperata forest of Shatan forest farm in Bailongjiang upstream was studied and its dominant population structure, static life table, survival curve were analyzed based on field investigation and data statistics with quantitative methods and time series models, in order to comprehend its species composition and survival status and predict the trend of population development as a theoretical basis for sustainable management of secondary forest in this forest area in the future. The result showed that there were 13 species in arbor layer of secondary forest community and large quantities of artificial P. asperata forests trees in the community. As dominant species in the community, the sum of important values of Betula albosinensis, Betula utilis and Abies faxoniana accounted for more than 80% of all. Moreover, A. faxoniana as expanding population, owned complete population structure, relatively stable life expectancy and mortality rates and higher survival rate of young individuals. Conversely, Birch forest had lower survival rate of young individuals, fluctuating life expectancy and unstable population structure. Furthermore, the survival curves of the 3 dominant populations were consistent with Deevey-Ⅱ, but some differences existed, and the structures of other small populations were mostly incomplete. In addition, quantitative dynamic analysis showed that the 3 dominant populations were all expanding populations. A. faxoniana had highest population stability, then B. albosinensis, and B. utilis was vulnerable to external disturbance. Finally, this study indicated that the existing community was Birch-A. faxoniana forest community in study area, and every population was still in the stage of mutual adaptation and showed unstable community structure. The population of A. faxoniana regenerate better and emerged further growth trend, but Birch forest went into decline and P. asperata forest plantation would be completely phased out. The community had an obvious tendency to become fir forest community, that was the succession process was P. asperata forest plantation, secondary forest, then A. faxoniana community, so advantages for the growth of fir forest should be provided in the future.

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