摘要
研究了青藏高原东缘不同海拔12个居群大耳叶风毛菊(Saussurea macrota Franch.)繁殖分配对海拔的响应。结果表明:(1)随着海拔的升高,大耳叶风毛菊个体大小呈现减小的趋势,但其繁殖分配随海拔升高而增大,这是为了保证顺利完成有性繁殖而采取的生存策略;(2)大耳叶风毛菊部分花部特征发生变异,以响应随海拔升高面临的传粉困难问题,保证花期传粉的最大成功几率;(3)随着海拔的升高,大耳叶风毛菊产生的种子数目减少,种子百粒重增加;花序和管状小花的数量均减少,而它们的重量均增加,即权衡现象在大耳叶风毛菊的这些器官中普遍存在。
The reproductive allocation of 12 Saussurea macrota Franch. populations at different elevations in eastern Qinhai-Tibetan Plateau was studied in this paper. The results showed that：（ 1） With the increase of elevation,the individual size of S. macrota decreased,and it invested more resource in reproductive organs to ensure sexual reproduction.（ 2） The floral traits of S. macrota changed with elevation,ensuring pollination effectively.（ 3） The seeds number of S. macrota decreased,while the 100-seed weight increased with rising the elevation. Meanwhile,the numbers inflorescence and tubulous flower decreased but their weights increased with the increase of elevation. Therefore,the trade-off is a common phenomenon in the organs of S. macrota.
出处
《生态学杂志》
CAS
CSCD
北大核心
2014年第12期3216-3221,共6页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31460105)
国家中医药管理局项目(201207002)
甘肃省自然科学基金项目(1208RJZA126)
兰州市科技局项目(2013-4-89)
甘肃省生态学
生物学重点学科项目资助
关键词
大耳叶风毛菊
投资
海拔
繁殖分配
权衡
个体大小
Saussurea macrota Franch.
investment
elevation
reproductive allocation
tradeoff
individual size.
