一、项目背景2017年3月国家自然科学基金面上项目“气候变化背景下积雪对棉铃虫越冬蛹的影响研究”通过了国家自然基金委的验收。该项目历时4年,圆满完成了项目预定的任务。棉铃虫的生长发育受天气因素的影响较大,冬季北方棉区常常被积雪覆盖,明确气候变化条件下积雪状况对棉铃虫越冬蛹的影响对农事生产活动意义重大。项目组在2012-2016年利用气象和虫害历史资料进行了越冬蛹发育的相关分析,并在田间进行了在不同土壤深度进行不同梯度的增温、增雪实验,通过监测积雪内部及其覆盖下土壤不同深 I. Project Background In March 2017, the project of National Natural Science Foundation of China, “Impact of snow on the overwintering pupae of cotton bollworms under the background of climate change” was approved by the National Natural Science Foundation of China. The project lasted for 4 years, successfully completed the project scheduled task. The growth and development of cotton bollworm are greatly influenced by weather factors. In winter, the northern cotton area is often covered by snow. It is clear that the influence of snow condition on wintering pupae of cotton bollworm is significant to agricultural activities. The project team used the meteorological and pest history data to conduct the correlation analysis of overwintering pupae development in 2012-2016. In the field, the experiment of warming and snowing with different gradients at different soil depths was conducted in the field. Under the soil different deep