下吹气流速度对杂交水稻授粉分布的影响

Effect of katabatic airflow velocity on the distribution of pollination of hybrid rice

利用吊扇模拟直升机产生下吹气流,设计下吹气流授粉试验装置,以花粉总量、花粉密度、花粉水平分布和垂直分布为评价指标,分析下吹气流速度对杂交水稻授粉花粉分布的影响。结果表明,花粉总量、花粉水平分布和垂直分布随着下吹气流速度的增大而增大。当下吹气流速度小于1.12 m/s时,花粉传播距离为0.42 m;当下吹气流速度为3.23 m/s时,花粉总量和分布范围较下吹气流速度为1.85 m/s时明显增加,花粉总量的增量为413粒,花粉有效分布面积率增长20.35%。

Ceiling fan was used to simulate helicopter to produce down blowing airflow, which was applied in design of a pollination device blowing katabatic airflow. Then total amount of pollens, pollen density, horizontal and vertical distributions of pollens were appraised to analyze the effects of down blowing airflow on the distribution of rice pollen during pollination. The results showed that the total amount of pollens, pollen density, pollen horizontal and vertical distributions increased with increasing velocity. When the air velocity is below 1.12 m/s, the propagation distance of pollens is 0.42 m. Total amount of pollens and distribution ranges under velocity of 1.85 m/s were obviously increased compared to those under velocity of 3.23 m/s, with total amount of pollens increased by 413 pollens and the percentage of effective pollen distribution area increased by 20.35%.