摘要
西宁地区苜蓿蚜种群数量随气候变化的增长曲线呈“S”型,其数学模型为:Y=9849/1+e^(8.9325+0.6949t),蚜量最快增长期为6月中旬至7月初;蚕豆生育期内月平均干燥度指数K>2.00以上,气候为干旱和很干旱等级时,蚜虫种群数量增长与同期≥5℃的积湿呈指数(Y=0.9377e^(0.0061ΣT))递增关系。
The dynamics of population growth of black bean aphid is S - shape curve in Xining. Its mathematical model:Y = 9849/1+e8.9325+0.69491(Y:population growth function;e:base of natural logarithm ; t: time). The population growth is the fastest during the middle ten days of June to the first ten days of July. If the weather is of drought or very drought, month mean dry index (K)>2.0, the aphid population presents a exponential growth as the quantity of heat accumulates(T>5C) at the same time, that is, Y = 0.9377e0.006l(T:value of temperature accumulation,T>5C)
出处
《青海大学学报（自然科学版）》
1999年第3期30-32,共3页
Journal of Qinghai University(Natural Science)
关键词
苜蓿蚜
种群变化规律
气候因素
蚕豆
害虫
Climatic factors, Black bean aphid, Dynamics of population growth
