RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (01): 55-62.doi: 10.11870/cjlyzyyhj201601007

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STUDIES ON POPULATION STRUCTURE AND DYNAMICS OF PINUS DABESHANENSIS

XIANG Xiao-yan1,2, WU Gan-lin1, DUAN Ren-yan1, WANG Zhi-gao1, ZHANG Zhong-xin1, WANG Guang-yan1, ZHANG Xiao-ping2   

  1. 1. School of Life Science, Anqing Teachers University, Anqing 246011, China;
    2. College of Life Science, Anhui Normal University, Wuhu 241000, China
  • Received:2015-04-13 Revised:2015-05-26 Online:2016-01-20

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Abstract: Pinus dabeshanensis Cheng et Law (P. dabeshanensis) is an endangered endemic occurring at the Dabieshan Mountains. This species is known from only 4 natural populations. Dawanggou in Yuexi County, Anhui Province, is known as the region hosting the largest population. Because of its small range, few populations, and small population sizes, P. dabeshanensis is considered "endangered" according to the China Species Red List. To obtain fundamental information of population structure and dynamics, we used spatial series substituting for time sery to analyze the population structure. And the time-specific life table, mortality rate, vanish rate as well as the four survival functional curve of the population were calculated, respectively. Additionally, spectral analysis was used to analyze the population dynamics. The results showed that P. dabeshanensis population was extremely small and population structure fluctuated. Although the seedlings were more abundant, young trees were very deficient, which suggested that the population was decreasing. The curves of mortality rate and vanish rate exhibited a similar variation tendency:peak exsisted in the 5th age class period. Four survival functional curves showed that the population decreased rapidly at the early ages, grew stably at the intermediate ages and declined in the late lifespanSpectral analysis of the population showed that the population dynamics had a clear periodic fluctuation in the growth except for the influence of fundamental wave, in which periodic fluctuation in waves A3 and A4 might be related to the individual growth. Based on the population information obtained for P. dabeshanensis, we propose some suggestions for the conservation and efficient management of this endangered species.

Key words: Pinus dabeshanensis, population life table, survival analysis, spectral analysis, population dynamics

CLC Number: 

  • Q948-1
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