白洋淀水位变化及其对东亚飞蝗大发生的影响

根据近50年白洋淀最高水位、入淀水量、出淀水量和降水量等资料，分析了白洋淀水位变化呈现的特点及原因；并结合东亚飞蝗的生长发育特点，探讨了水位的年际、年内变化对东亚飞蝗大发生的影响。结果表明，近50年白洋淀最高水位呈波动中降低趋势，白洋淀逐月水位年内差异逐渐变小。原因主要为上游来水大量减少所致。白洋淀水位年际变化中，峰值回落阶段和波谷地段对应的年份易于东亚飞蝗大发生。5～10月白洋淀逐月水位偏低有利于东亚飞蝗大发生。这些结论为白洋淀水量调控和预防东亚飞蝗大发生提供依据。

Changes of water level of Baiyangdian Lake and its effect on Locusta Migratoria Manilensis Meyen

Based on the highest water level, input water, output water and rainfall at Baiyangdian Lake in recent 50 years, the characteristics of water level changing and the corresponding reason are analyzed. Furthermore, combined with the upgrowth of Locusta Migratoria Manilensis Meyen, the effects of the water level changes on outbreak of Locusta Migratoria Manilensis Meyen were studied on the aspect of yearly and monthly changes of water level. The result shows that the water level of Baiyangdian Lake fluctuantly decreased in recent 50 years; the monthly difference of water level in a year became smaller; the reason was the decrease of input water from upriver. There exist more possibilities for Locusta Migratoria Manilensis Meyen to outbreak immediately after going back from the peak value and trough of water level. Moreover, the comparatively low water level between May and October may accelerate the outbreak of Locusta Migratoria Manilensis Meyen. The conclusions are useful for controlling storage of water at Baiyangdian Lake, predicting and preventing the outbreak of Locusta Migratoria Manilensis Meyen.