模拟增温效应对西藏苔草繁殖生态的影响  

Effect of simulated warming on the reproductive ecology of Carex thibetica Franch

作　　者：赵玉红[1] 魏学红[1] 沈振西[2] 孙磊[1] 牛歆雨[1] 

机构地区：[1]西藏农牧学院,西藏林芝86000 [2]中国科学院地理科学与资源研究所,北京100101

出　　处：《生态环境学报》2010年第8期1783-1788,共6页Ecology and Environmental Sciences

基　　金：西藏农牧学院青年基金项目;国家自然科学基金项目(30860061);国家"十一五"科技支撑计划重点项目(2007BAC06B01);农业部公益性行业专项(20090360)

摘　　要：通过采用国际冻原计划模拟增温对植物影响的方法,从繁殖生态学角度研究了西藏苔草(Carex thibetica Franch)种群的物候期、分蘖数、生物量和种群繁殖对增温的响应。结果表明:暖棚内气温、土壤表层温度分别了1.17℃和1.50℃;物候期提前或延迟,生长期延长;增温可以提高西藏苔草的生殖产量,但不提高其种子发芽率;增温可提高西藏苔草分蘖数和生物量;西藏苔草繁殖对策趋于营养繁殖。The International Tundra Experiment method was applied to examine the impact of simulated greenhouse effect on plant.The responses of phenological phase,tiller number,biomass and population reproductivity to increased temperature were studied in this paper.The results showed that air and soil surface temperature in greenhouse were increased by 1.17 ℃and 1.50 ℃ respectively.Phenological phases of Carex thibetica Franch had arrived earlier or later in the treatment.This treatment had positive effect on reproductive output,tiller number and biomass but no clear effect on germination rate.Therefore the reproductive strategies of Carex thibetica Franch favor more to vegetative reproduction.

关 键 词：西藏苔草 模拟增温 繁殖效力 繁殖策略 

分 类 号：X16[环境科学与工程—环境科学]