圆形分布法在探讨蝇类季节消长规律中的应用

目的确定蝇类季节消长的高峰日和高峰时段，科学制定防制策略。方法用圆形分布法统计分析赤峰市区1998～2000年蝇类密度监测数据。结果赤峰市区1998～2000年蝇类平均密度高峰日为7月13日，高峰时段为5月25日至9月1日。其中1998年蝇类季节消长高峰日为7月20日，高峰时段为5月31日至9月7日；1999年蝇类季节消长高峰日为6月30日，高峰时段为5月15日至8月16日；2000年蝇类季节消长高峰日为7月23日，高峰时段为6月3日至9月12日。结论3年中蝇类的活动高峰有明显的季节性；圆形分布法可适用于蝇类的季节性分析。

Application of the Round Distribution Method to Probe the Seasonal Change of Flies

Objective To find out the peak day and the peak periods of the seasonal change in numbers of flies, so as to work out a scientific plan for controlling and preventing the flies. Methods The round distribution method was used to analyze the datum collected from the years of 1998 2000 to monitor the change in numbers of flies. Results It was showed that in Chifeng urban district,the peak day of the seasonal change in flies was July 13th during the years of 1998 2000; but in the single year. It was July 20th in 1998, June 30th in 1999 and July 23th in 2000. The peak period of the seasonal change in flies were from May 25th to Sep 1st during the years of 1998 2000, however,in the single year. It was from May 31th to Sep 7th in 1998, from May 15th to Aug 16th in 1999 and from June 3th to Sep 12th in 2000. Conclusion The change in numbers of flies has a obvious seasonal feature during the years of 1998 2000. The round distribution method is suitable to analyzing the seasonal change in numbers of flies.