摘要
通过频次分布和聚集度指标测定以及M*-m回归和Taylor幂法则分析,黄瓜霜霉病病株田间分布趋于均匀分布,病叶间互相排斥,但在特殊情况下,也会出现聚集分布现象,即为田间中心病株。在此基础上,提出了最适理论抽样数模型[N=t2/D2(0.5610/m+2.4539)]。
Four methods of aggregated indices and Iwao＇s way （regressive relation by M^＊ - m） and power law of Taylor were used to test the spatial distribution pattern of infected plants caused by downy mildew in cucumber field. The results showed that the infected plants characterized with uniform distribution. Based on this distribution pattern, the model [ N = t^2/D^2（0.5610/m ＋ 2.4539）] for determining the optimum theoretical sampling number was proposed.
出处
《浙江农业学报》
CSCD
2006年第4期277-279,共3页
Acta Agriculturae Zhejiangensis
基金
浙江省重点农业科研项目(2005C22007)
关键词
黄瓜霜霉病
空间分布型
理论抽样数
cucumber downy mildew [ Pseudoperonospora cubensis （Berk et Curt）Rostov]
spatial distribution pattern
the-oretical sampling number
