Population Structure and Dynamic Characteristics of the Endangered Plant Chunia bucklandioides in Diaoluo Mountain of Hainan

Huiying GUI, Fazhi FANG, Zhaojia LI, Youzhuan MAI, Xiaofeng ZHANG

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Bulletin of Botanical Research ›› 2024, Vol. 44 ›› Issue (1) : 75-85. DOI: 10.7525/j.issn.1673-5102.2024.01.010
Physiology and Ecology

Population Structure and Dynamic Characteristics of the Endangered Plant Chunia bucklandioides in Diaoluo Mountain of Hainan

  • Huiying GUI, Fazhi FANG(), Zhaojia LI, Youzhuan MAI, Xiaofeng ZHANG
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Abstract

In order to explore the population structure and dynamic characteristics of Chunia bucklandioides in Diaoluo Mountain of Hainan, the local wild population of C. bucklandioides was taken as materials, and the concentrated distribution area of the population was set as a typical sample plot to survey, and construction of population age structure instead of space for time was designed. The current population structure and dynamic characteristics were analyzed by the dynamic quantitative analysis, survival curve drawing and survival function calculating, and the future development trend of C. bucklandioides was speculated by time sequence prediction model. The results showed that: (1)The age structure of C. bucklandioides population in Diaoluo Mountain was close to an irregular pyramid type. Dynamic quantitative analysis showed that the population was a growing population, but there was a decline trend from the age class Ⅰ to Ⅲ. The population had weak growth, poor stability, high sensitivity to external interference, and a trend towards a stable population. (2)With the increase of age class, the number of standardized survival individuals decreased, the life expectancy decreased, and the mortality and vanish rate showed an upward trend. The survival curve tended to be Deevey-Ⅱ type. (3)Survival analysis showed that the population of C. bucklandioides in Diaoluo Mountain increased in the early stage, stabilized in the middle stage, and declined in the late stage. (4) After two, four and six age classes in the future, there would be a gradually decreasing trend from I to Ⅲ age class, and slightly increasing trend from Ⅳ to Ⅶ age class. The self-renewal ability of young seedlings was insufficient, and there was a risk of population shrinkage and decline. Consequently, habitat fragmentation, small distribution range, low seed yield and insufficient young individuals might be the main factors leading to the endangerment of C. bucklandioides in Diaoluo Mountain. The results suggested to promote the rejuvenation and renewal of C. bucklandioides population by setting up small nature reserve, assisting seed germination, accelerating artificial cultivation technology research, artificially expanding population size and quantity, and strengthening basic research.

Key words

endangered plants / Chunia bucklandioide / population structure / survival analysis / time sequence analysis

CLC number

Q145+.1

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Huiying GUI, Fazhi FANG, Zhaojia LI, Youzhuan MAI, Xiaofeng ZHANG. Population Structure and Dynamic Characteristics of the Endangered Plant Chunia bucklandioides in Diaoluo Mountain of Hainan. Bulletin of Botanical Research. 2024, 44(1): 75-85 https://doi.org/10.7525/j.issn.1673-5102.2024.01.010

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