摘要
据1986、1987年在天津西郊大棚黄瓜系统调查,采用m—m回归法对茶黄螨在大棚黄瓜田间危害空间分布型及抽样技术进行了初步研究.结果认为田间受害株密度小于0.5271时,茶黄螨危害株的田间分布为聚集分布型;大于0.5271时则为均匀分布型.计算得出不同受害级别下相应的最适抽样数,随着受害程度的加重,抽样数明显减少.
Based on the data of systematic abservation taken from the cucumber plants grown in glasshouses (unheated ) , at west suburb of Tianjin, in 1986 and 1987, using m*-m method, the spatial distribution of cucumber plants infested by Polyph agotarson emus Latus (Banks) and sampling technique were studied. The results showed that the distribution pattern was an aggregated as the density was below 0.5271, but as the density increased, it then became uniform distribution; the sampling numbers varied with different infested degrees: as the degree becomes heavily, the number will go down evidently.
出处
《华北农学报》
CSCD
北大核心
1989年第1期96-101,共6页
Acta Agriculturae Boreali-Sinica
关键词
茶黄螨
空间分布型
抽样技术
Polyphagotarsonemus Lotus
Spacial distribution aggregation
Sampling technique
Mean crowding
