摘要
通过对蒙古莸自然种群和人工种群的开花物候进程观察,统计不同种群的结实率,分析开花物候对其生殖成功的影响。结果表明:(1)蒙古莸花期在7月末至9月中旬,人工种群较自然种群的开花物候明显提前,其中始花期提早4～5d,但两个种群的花期持续天数基本一致。(2)蒙古莸个体间具有较高的开花同步性,不同种群蒙古莸植株的开花同步性指数均大于0.80,且自然种群略高;晴好天气下绝大多数花朵都集中在上午10:00以前开放,阴雨天则延迟开放或者不开放,这种"集中开花模式"增加了传粉者的访问频率,是蒙古莸提高生态适应性、保障其生殖成功的一种表现。(3)开花物候指数与结实数之间的相关分析表明,花序水平上,开花数及花期持续时间与结实数呈极显著正相关关系。
The flowering phenology and reproductive features of Caryopteris mongolica were investigated.The results showed that：（1）There were significant differences in flowering phenology of C.mongolica between artificial and natural populations.The dates of flowering phenology were also different in the same population in different years.（2）The flowering processes similarly exhibited a so-called “Mass-flowering pattern”,which might be regarded as an adaptive strategy to ensure its reproductive success.Most flowers opened before 10：00 AM in sunny days but delayed or non-flowering in cloudy or rainy days.（3）Inflorescences with more flowers showed a longer duration and more fruits than those with fewer flowers.
出处
《西北植物学报》
CAS
CSCD
北大核心
2012年第10期2040-2046,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
内蒙古自然科学基金(2011MS0515)
蒙古高原特有植物-蒙古莸的繁殖生物学研究
关键词
蒙古莸
开花物候
结实数
Caryopteris mongolica Bunge
flowering phenology
fruit number
