Arid Zone Research ›› 2019, Vol. 36 ›› Issue (5): 1153-1160.doi: 10.13866/j.azr.2019.05.12

• Plant and Plant Resources • Previous Articles     Next Articles

Age Composition and Quantitative Dynamic Status of Malus sieversii Population

SU Zhi-hao, LI Wen-jun, CAO Qiu-mei, ZHOU Xiao-bing, ZHANG Yuan-ming   

  1. CAS Key Laboratory of Biogeography and Bioresources in Arid Land,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China
  • Received:2018-12-06 Revised:2019-03-04 Published:2025-10-14

Abstract: Malus sieversii is a Tertiary relic species.With the continuous reduction of population quantity and distribution area,the species is now on the verge of extinction.In this study,the analyses on the life tables,survival curves and time series of M.sieversii were carried out so as to illuminate the age composition and developing trends within the populations.The results showed that there were almost no the seedlings in the first-age class in all the populations,and only a few ones in the second-age class were survival in the population at Agricultural Improvement Station in Xinyuan County,Xinjiang.The dominant age classes in the most populations were the 4th and 5th and even up to 6th and 7th in the Balian population.In short,the mid- and old-aged individuals were dominant in all the populations.The survival curves of M.sieversii populations trended to Deevey-II type.It was predicted that the dominant age classes in all the populations would become much more ageing after 20,40 and 60 years.It was suggested to build a genetic resources center of M.sieversii,grow and transplant the seedlings,and strengthen the management to the populations.

Key words: Malus sieversii, static life table, time series, age composition, population dynamic status