论文部分内容阅读
应用 5种聚集度指标和泰勒幂法则、Iwao法M =α + β x、扩散型指数Iδ 对草坪草条锈病的空间分布格局进行测定 ,结果表明 :在不同的草种、不同播种方式和不同发病程度下 ,草坪草条锈病均表现为聚集分布且存在着个体群。聚集均数 (λ)的测定表明 :草坪草条锈病的聚集原因系由病原菌本身特性和环境条件引起。并确定了病叶密度和不同允许误差下的理论抽样数
The spatial distribution pattern of turfgrass rust was determined by using Iwao’s method M = α + β x and diffusion index Iδ, using five kinds of aggregation indexes and Taylor’s power law. The results showed that in different grass species, different sowing methods and different The incidence of turfgrass rust showed aggregated distribution and the existence of individual groups. Aggregation mean (λ) measurements showed that: turfgrass rust accumulation caused by the characteristics of the pathogen itself and environmental conditions. And the diseased leaf density and the number of theoretical samples with different allowable errors were determined