摘要
1983～1984年在武昌,分别以水稻本田6.25m^2和秧田4.5om^2为样方,研究了二化螟卵块在本田(中稻第二代,双季晚稻第三代)和秧田(双晚秧田第二代)的分布型。结果表明,卵块的分布型依其密度而变化。借助m/m～m回归分析得到,当本田和秧田平均卵量分别低于0.962块/样方和0.897块/样方时,卵块呈聚集分布(置信概率P>0.95),超过此密度将趋于随机分布。
Field surveys were conducted in 1983 and 1984 in Wuchang region, Hubei province, to evaluate the distribution pattern of egg-mass population of rice striped borer, Chilo suppressalis Malker, in rice seedling fields and paddy fields. With the areas of approximate 4.50m^2 and 6.25m^2 as the cardinal quadrants of rice seedling and paddy fields respectively, the observations shown that the distribution pattern varied with egg-mass densities. Based on the regression analysis of mean-crowding (m) /mean-density ( m ) on meandensity(m), it was obtained that when egg-mass density was lower than 0.962 and 0.897 egg-masses per quadrant in seedling and paddy fields respectively,the population was aggregatedly distributed, and beyond the above densities, the population would tend gradually to random distribution.The factors which cause the egg-mass population aggregated vere also discussed in this present paper.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1989年第1期29-35,共7页
Journal of Huazhong Agricultural University
关键词
水稻
二化螟
空间分布型
rice
Chilo suppressalis Walker
distribution pattern
