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Study on the demography of reproductive modulars and reproductive allocation of a Stellera chamaejasme population

The quantitative characteristics of reproductive modulars (RM), reproductive allocation (RA) and the relation between the traits and the ages of a S. chamaejasme population which were distributed over three grazing successional stages (GSS), have been studied, with the results presented in this paper. The populations were located on the degraded steppe of eastern Inner Mongolia, China. The three GSS were defined as either over, heavy or extreme. The results show that: (1) the number of inflorescences per individual, number of flower buds per inflorescence and number of flowers per inflorescence of the population in the extreme GSS was significantly higher (P0.05) than that in the heavy and over GSS, however the 1000-seed weights did not differ significantly (P0.05) between the three GSS; (2) the number of flower buds, flowers, and seeds per individual in the 6-14 year olds increased with aging before stabilizing from 15 years old onward; (3) the RA value in the flowering stage was higher than in both the flower bud and fruiting stages within the same GSS; (4) the youngest reproductive age of the individuals was 6 years old and the oldest 19 years, with considerable fecundity found in older individuals; (5) the total mean RA value of aboveground biomass was 8.62% and the RA pattern of stemleafRA of the population was 561, with RA shown to be non-significantly affected by grazing disturbances. Stabilization of a lower RA and longevity of individuals were possibly survival strategies of S. chamaejasme, which were favorable to higher survival rates and consequently the proliferation of the population.