| 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55 d可看作一个周期,后128 d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. |
| 关键词: 棉蚜 周期性分析 趋势性分析 动态模型 |
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| 基金项目:国家自然科学基金项目(30470268,39970122) |
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| Trend analysis and periodic analysis of aphid population |
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| Abstract: |
| 【Objective】 The study was done in order to provide reference for cotton aphid's 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 lab's 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. |
| Key words: cotton aphid trend analysis periodic analysis dynamic model |
