摘要
本试验采用玻片捕获法测定了扁穗牛鞭草（Hemarthria compressa）种群花粉密度的日变化及不同风速条件下花粉散布格局。结果表明,开花时间集中在上午06：00-08：00和下午15：30-19：00,其中16：00-18：00花粉散布数量最多。无风（风速〈1 km/h）及一级风（风速1~5 km/h）条件下,花粉主要散布在花粉源周围5 m内;三级风（风速12~19 km/h）条件下,可在距离花粉源21 m处捕捉到花粉。在花粉散布的主要范围内,扁穗牛鞭草植株基本上来源于同一基株,同株异花授粉现象不可避免。花粉散布特性与专性远交繁育系统之间的矛盾是造成其结实率低的原因之一。
The daily changes of pollen density and the dispersal patterns of Hemarthria compressa were measured by air pollen trapping method.The results showed that there were two peaks of flowering time during 6：00-8：00 and 15：30-19：00,and the highest amounts of pollen grains collected was during 16：00-18：00.We found that wind speed affected the distances of the pollen grains distributions.The pollen grains distributed within the circle of 5 m from the pollen grain originate place,when the wind speed was lower thatn 1 km/h（0 grade） or between 1-5 km/h（1 grade）,and within the circle 21 m when the wind speed was between 12-19 km/h（3 grade）.The plant stands comes from the same mother plant in the areas of pollen distributed,so the cross-pollination in the same plant stand was common.The dilemma between pollen distribution pattern and cross pollination reproduction system was one of the reason of low seed set.
出处
《草业科学》
CAS
CSCD
北大核心
2011年第6期974-977,共4页
Pratacultural Science
基金
四川省国际合作项目(2009HH0019)
关键词
扁穗牛鞭草
花粉散布
花粉密度
克隆生长
Hemarthria compressa
pollen dispersal
pollen density
clonal growth
