摘要
对大豆蚜种群和有蚜株的空间分布型及抽样技术进行研究结果表明,大豆蚜种群的空间分布型在一定密度下均呈聚集分布,其分布的基本成份是个体群,引起大豆蚜聚集的原因是其个体间互相吸引等本身行为所致。而大豆蚜有蚜株的空间分布型,在有蚜株率较低时呈均匀分布或随机分布。随着有蚜株率的增高而呈均匀分布。对大豆蚜种群密度的调查,用平行线、棋盘式和“Z”形等抽样方法都适用。此外,将调查数据运用Iwao提出的平均拥挤度与平均数的线性回归式中的α、β值作为两个参数的理论抽样数和序贯抽样公式进行计算,得出大豆蚜种群密度和有蚜株率调查的理论抽样数和序贯抽样结果。
The result shows that the spatial distribution pattern of soybean aphid population is aggregate under certain densities. The basic elem- ents of distribution are individual colony. The soybean plants inferted by aphids is uniformly or randmly distriduted when the infesting rate is low but the uniform distribution prevails with the increasing of the rate of infesting. The sampling methods, such as parallel, chessboard and 'Z' pattern, may all be used in the investigation of population dendity of soybean-aphid. The formalae of theoritical sampling number of soybean-aphid population density and infested plant rate investi- gation are N=2461 X^(1/2)+9, N=121.26 X^(1/2)-20.97 respectively whilc their sequential sampling formulae are To(N)=500N±373.12 N^(1/2),To(N) =3.3N±1.29 N^(1/2).
出处
《沈阳农业大学学报》
CAS
CSCD
1992年第2期81-87,共7页
Journal of Shenyang Agricultural University
关键词
大豆蚜
平均拥挤度
分布型
大豆
soybean aphid
average ckowding rate
distsibution pattern
sampling technique
