关键词: 布氏田鼠, 食物多样性, 存活率, 生长率

Abstract: To explore the relationship between diet diversity and the population of small mammalian herbivores,this study measured the effects of diet diversity on survival rate and body growth rate of young Brandt's voles(Lasiopodomys brandtii) fed diets with five different common herbaceous plants containing Leymus chinensis,Stipa krylovii,Medicago sativa,Allium mongolicum,or Convcolvulaceae sepium.The results showed that(1) As the richness of food items increased,the survival rate of young Brandt's vole was significantly increased(P<0.05).Compared with voles fed with diet only containing one plant species,voles fed with diet containing 2,3 and 4 plant species increased their survival rates by 15.6%,18.0% and 12.2% respectively.Each specific plant species contributed differently to the survival rate of young Brandt's vole(P<0.01).With the increase in the proportion of Stipa krylovii and Convcolvulaceae sepium in the dietary,the survival rate of young Brandt's vole was significantly decreased(P<0.05).(2) As the richness of food items increased,the body growth rate of young Brandt's vole was significantly decreased at fifth weeks(P<0.05).Each specific plant species contributed differently to the body growth rate of young Brandt's vole(P<0.01).With the increase in the proportion of Leymus chinensis in the dietary,the body growth rate of young Brandt's vole was significantly increased at fifth week(P<0.01).With the increase of the proportion of Stipa krylovii in the dietary,the body growth rate of young Brandt's vole was significantly decreased at third and fifth week(P<0.05).With the increase in the proportion of Convcolvulaceae sepium in the dietary,the body growth rate of young Brandt's vole was significantly decreased at third week(P<0.01).Diet diversity improves the survival rate and reduces the body growth rate of the young Brandt's vole,the survival rate and the body growth rate of young Brandt's vole were reduced by Stipa krylovii and Convcolvulaceae sepium,the body growth rate of Brandt's vole was improved by Leymus chinensis.Diet diversity can influence survival rate,growth and population density of Brandt's voles.

Key words: Brandt's vole(Lasiopodomys brandtii), Diet diversity, Survival rate, Body growth rate