Chin J Plan Ecolo ›› 2006, Vol. 30 ›› Issue (3): 426-431.DOI: 10.17521/cjpe.2006.0057

• Research Articles • Previous Articles     Next Articles

QUANTITATIVE CHARACTERISTICS OF TWO POPULATIONS OF SLADENIA CELASTRIFOLIA UNDER DIFFERENT LEVELS OF HUMAN DISTURBANCE

CHEN Guo_Ke1,2; PENG Hua1   

  1.  (1 Kunming Institute of Botany, Chinese Academy of Sciences, Kunming  650204, China);(2 Graduate School of Chinese Academy of Sciences, Beijing  100039, China)
  • Online:2006-05-30 Published:2006-05-30
  • Contact:  PENG Hua

Abstract:

Sladenia celastrifoliahas a scattered distribution in Southwest China , especially in Yunnan Province. However, characteristics of many populations have been largely altered by increasing human activities. Using age_diameter relationships, we analyzed the age structure, the life table and the survival curves  of two populations of this species, which have been affected by human disturbance to different degrees. In the heavily disturbed population, there were fewer young_aged  individuals. The individuals of the age class Ⅰ account for only 12.7%, whereas those of the age class Ⅱ, Ⅲ, and Ⅳ together account for 80.3% of the total individuals of the population, indicating a declining population. In contrast, the age structure of the less disturbed population appeared to be stable with sufficient numbers of young_aged individuals. The life tables of the two populations  were different: the death rates of the age class Ⅰ and Ⅱ were negative, indicating a shortage of young_aged individuals. The survival curves of both populations were characterized by high death rates of young_aged individuals, while the death rates of all age classes of the less disturbed population were stable.  The age structure and dynamics of the two populations of this species are similar to those of some other endangered species in China, such as Liriodendron chinense and Cathaya argyrophylla. Although S. celastrifoliahas not been regarded as an endangered species until now, it has attributes typical of an endangered species according to the standards of IUCN. Therefore, more attention should  be paid for the conservation of this species such as establishing nature reserves in its original habitat as well asex_situconservation efforts.