摘要
通过田间系统调查和资料计算,采用6种聚集指标和Iwao,Taylor法测定,结果表明,辣椒疫病株在田间以个体群呈聚集分布,个体群内部的分布是随机的,空间分布型属负二项分布。明确了构成聚集的原因,既包括病菌本身的特性,也包含着它对环境条件差异的反应结果。通过对五种抽样方法的比较,认为田间调查时,采用对角线取样方法为好,省时,省力,误差较小,其抽样数量由田间发病程度决定,发病越轻,抽样量越大。
By systematic survey in the field, using six collecting targets and two test methods (the Iwao method and the Taylor method) the epidemic disease of pepper was in collecting distribution as a crow in the field. The inside distribution of a crow was random. The spatial distribution pattern was a negative binomial distribution. The reason for making up collecting was attributed to the characteristics of pathogenic bacteria themselves and the reactions upon the different environment conditions. In order to select a best way for field survey, five sampling methods were used and the diagonal sampling method showed time saving, labour sparing and error diminishing; its sampling; quantity was depended on the incidence of the disease. The less the disease occured, the more the samples should be taken.
出处
《甘肃农业大学学报》
CAS
CSCD
1991年第4期415-419,共5页
Journal of Gansu Agricultural University
关键词
辣椒疫病株
空间分布型
epidemic disease of pepper
spatial distribution pattern