河北夏蝗大发生与气象条件的关系

利用合成分析和秩相关系数2种方法,分析了河北2种生态类型蝗区中夏蝗LocustamigratoriaL.发生程度与气象条件的关系,以确定影响夏蝗大发生的关键气象因子。结果表明:2个类型蝗区大发生年以前一年5月至当年夏蝗出土以前的气温偏高、降水偏少为主;前一年6月下旬、7月上旬、8月上旬、8月中旬气温、6月上旬降水、当年3月下旬降水、4月下旬气温为沿海蝗区关键影响因子,前一年7月上旬和8月下旬气温、5月中旬降水及当年2月中、下旬气温、4月下旬和5月上旬气温为洼淀蝗区的关键影响因子。

Relationships between outbreaks of Locusta migratoria summer population and meteorological conditions in Hebei

Compound analysis and Spearman order correlation methods were used to analyze the relationship between the intensity of Locusta migratoria L. in summer and meteorological conditions in 2 ecological regions (costal areas and billabong areas) in Hebei Province of China. The results showed that higher temperature and less precipitation from May of the previous year to the beginning emergence of first instar nymph are main meteorological factors for severe outbreaks of the locust in summer of present year. The air temperature of thirddekad in June, July and August and the second dekad in August, and the precipitation of first dekad in June of the previous year, and the air temperature of the third-dekad in April and precipitation of the third dekad in March of the present year are key meteorological factors to influence the locust -outkreaks in costal areas. However, That is the air temperature of the first dekad in July and the third dekad in August, and the precipitation of the second dekad in May of the previous year, and the air temperature of the second and third dekad in Feb., the third dekad in April and the first dekad in May of the present year in billabong areas.