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Scientia Silvae Sinicae ›› 2001, Vol. 37 ›› Issue (2): 36-41.doi: 10.11707/j.1001-7488.20010205

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THE CHARACTERISTICS OF REPRODUCTIVE ECOLOGY OF ENDEMIC SPECIES TETRAENA MONGOLICA POPULATION IN CHINA—?Reproductive Value and Reproductive Allocation

Xu Qing,Liu Shirong,Zang Runguo,Guo Quanshui,Hao Yuguang   

  1. The Research Institute of Forest Ecology,Environment and Protection,CAF Beijing 100091;Experimental Center of Desert Forestry of CAF Dengkou 015200
  • Received:2000-05-09 Revised:1900-01-01 Online:2001-03-25 Published:2001-03-25

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Abstract:

In this paper,the reproductive value and reproductive allocation of Tetraena mongolica were studied.The results showed that the curve of reproductive value (Vx) with increasing age tended to be low-high-low pattern.The change pattern of Vx in the age of 3～9,10～21,and older than 21 years was in the state of slow increase,rapid increase,and slow decrease respectively.The reproductive value was controlled by both the selective pressure of environment (Kx) and its own survival rate (Lx).The reproductive allocation value (RA) changed with the reproductive phase of T.Mongolica.RA decreased from the stage of flowering to frutiting.RA value increased with the age in the period of 4～21 years and decreased after 21 years.According to the relationship between reproductive age and reproductive allocation,the reproductive phase of the population could be divided into 4 stages:initial (less than 9 years old),increment (from 9～12 years old),peak (13～27 years old),and decline reproductive phase (older than 27 years old).

Key words: Tetraena mongolica, Reproductive value, Reproductive allocation