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Bulletin of Botanical Research ›› 2019, Vol. 39 ›› Issue (5): 664-672.doi: 10.7525/j.issn.1673-5102.2019.05.004

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Population Structure and Dynamics of Original Abies faxoniana Rehd—Rhododendron simsii Planch in High-mountain Timberline of Southern Gansu Province

WANG Fei1,2, HUO Huai-Cheng1,2, ZHAO Yang1,2, CAO Xiu-Wen1,2, LIU Jin-Qian1,2, YANG Yong-Hong1,2, ZHANG Tao1,2, QI Hao1,2, WANG Ruo-Jian1,2   

  1. 1. Institute of forestry Science, Bailongjiang Forestry Management Bureau of Gansu Province, Lanzhou 730070;
    2. Gansu Bailongjiang National Forest Ecosystem Research Station, Zhouqu 746300
  • Received:2019-02-14 Online:2019-09-05 Published:2019-07-16
  • Supported by:
    Gansu forestry science and technology project(2015kj048,2015kj045,2016kj058)

Abstract: Alpine forest line is a typical ecotone and one of the most sensitive areas to reflect the climate. The dominant species of the alpine forest line area are firs and Rhododendrons in southern Gansu Province. In order to predict the future development trend, the static life table of the fir and Rhododendron populations were established to analyze the structural characteristics and the population dynamics prediction time series. The results showed that:(1)The seedlings of Mingjiang fir were relatively abundant and could maintain the self-thinning death of individuals, the survival curve was Deevey-Ⅲ type; the amount of seedlings of Rhododendron were relatively small, and the survival curve tended to Deevey-Ⅰ type; the death curve and the risk curve increased with the age class, and the death curve of Rhododendron population was always greater than that of Mingjiang fir population. The risk rate of Rhododendron population was always larger than Minjiang fir population after the second age class. (2)The dynamic index Vpi of population structure of Minjiang fir was larger than the revised dynamic index V'pi and greater than 0, while the dynamic index Vpi of Rhododendron population structure was smaller than the revised dynamic index Vpi and less than 0. The Minjiang fir population belonged to the growth type, the Rhododendron population belonged to the recession type. The maximum value of random interference of Minjiang fir and Rhododendron population were 0.027 and 0.011, respectively, indicating both of them were sensitive to external interference. (3)The time series of rhododendron population was predicted dynamic characteristics of seedling shortage, stability in the middle stage and decline in the late stage, meanwhile, Minjiang fir population was small change in time at different age levels, a large number of seedlings and a stable growth type. Minjiang fir population can adapt to the current environment in the alpine forest line region of southern Gansu Province better.

Key words: Abies faxoniana, Rehd-Rhododendron, population structure, life table, survival curve, time sequence analysis

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