摘要
资源分配策略是植物生活史研究的重要内容之一,植物花大小、数量资源的分配比例与植株个体大小及生境密切相关。本研究利用样方调查法,对祁连山北坡高寒退化草地4个海拔狼毒(Stellera chamaejasme)种群花大小、数量与植株个体大小(地上生物量、株高)间的关系进行了研究。结果表明:随着海拔的升高,狼毒地上生物量、株高、花数量均呈减小趋势,繁殖分配和花大小均呈增大趋势;在海拔梯度上,狼毒花数量与地上生物量呈极显著正相关(P<0.01),与株高呈不显著正相关(P>0.05);花大小与地上生物量、株高均呈不显著负相关(P>0.05),说明狼毒种群花数量与地上生物量具有显著的依赖关系。研究发现,生境对狼毒花大小、数量与个体大小之间的依赖关系产生重要影响,高海拔的环境胁迫导致狼毒个体减小,植株通过增加花大小、减小花数量的资源分配策略来保证其种群的成功繁殖。
Resource allocation strategy is one of the important contents in the study of plant life history, while the resource allocation between flower size, flower number, and plant size has a close relationship with habitat. By using the method of sampling site investigation, this paper studied the relationships between the flower size, flower number, and plant size （aboveground biomass and plant height） of Stellera chamaejasme population in degraded alpine grasslands at four different altitudes on northern slope of Qilian Mountains, Northwest China. With the increase of altitude, the aboveground biomass, plant height, and flower number of S. chamaejasme popu- lation declined gradually, but the reproductive allocation and flower size increased gradually. Along the altitude gradient, the flower number had a significant positive correlation with aboveground biomass （P〈0.01）, but less correlation with plant height （P〉0.05）. The flower size had less correlation with aboveground biomass and plant height （P〉0.05）. The results dem- onstrated that the flower number of S. charaaejasme population had a significant dependency with aboveground biomass. It was observed that habitat had significant effects on the dependency a- mong flower size, flower number, and plant size. High-altitude environmental stress induced the decrease in plant size. The S. chamaejasme plant ensured its population reproductive success via the resource allocation strategy of increasing flower size and reducing flower number.
出处
《生态学杂志》
CAS
CSCD
北大核心
2013年第12期3160-3166,共7页
Chinese Journal of Ecology
基金
国家自然科学基金项目(91125014和40971039)
甘肃省科技支撑计划项目(1011FKCA157)资助
关键词
海拔
狼毒
花大小
花数量
个体大小
高寒退化草地
altitude
Stellera chamaejasme
flower size
flower number
plant size
degraded al-pine grassland.
