摘要
【目的】为棉蚜防治提供参考依据。【方法】于1990-04-10对大田棉蚜种群数量进行调查统计,对棉蚜种群数量的周期性及趋势性进行分析。【结果】棉蚜种群数量的趋势性曲线可以用一个多项式来拟合;棉蚜的在一年之内的周期可以分为两段:前55d可看作一个周期,后128d可看作一个周期,并根据周期相角重新给出棉蚜种群数量的周期函数。【结论】建立了棉蚜种群数量的一般动态模型,该模型由趋势项和周期项组成。
[Objective] The study was done in order to provide reference for cotton aphidrs effective control. [Method] The number of cotton aphid from April to October in 1990 was investigated,and then trend analysis and periodic analysis were made with labrs data. [Result] The year trend of cotton aphid could be simulated with a three cubed polynomial. Furthermore,Cotton's year periodicity could be divided into two periodicities,front 55 d first periodicity,the other latter 128 d,and a new periodicity's function was also given with new phase angle. [Conclusion] The study established a general dynamic model of cotton aphid,which was formed by a trend term and a periodicity term.
出处
《西北农林科技大学学报(自然科学版)》
CSCD
北大核心
2008年第7期207-211,218,共6页
Journal of Northwest A&F University(Natural Science Edition)
基金
国家自然科学基金项目(30470268
39970122)
关键词
棉蚜
周期性分析
趋势性分析
动态模型
cotton aphid
trend analysis
periodic analysis
dynamic model