摘要
为了解小地老虎的生态习性 ,制定正确的抽样方法 ,用Taylor幂法则S2 =ax-b及各种聚集度指标 ,分析了小地老虎卵的空间分布型 ,结果表明 ,各组的I、K、Ca值均大于 0 ;Iδ、 m/ x及 L/ ( 1+ x)均大于 1;扩散系数C值均大于置信区间上限 ,(C显著大于 1) ,说明小地老虎卵在不同生态环境菜地、洋芋地等呈聚集分布。各组λ值均小于 2 ,表明小地老虎卵聚集是由环境条件引起的。在此基础上得出其理论抽样数模型 :n =t2D2 ·4 692 x- 0 798。
Several aggregation indices and the Taylor method were used to test the spatial distribution of eggs of Agrotis ipsilon. The results showed the distribution pattern belongs to aggregative distribution in various ecological environments such as the cabbage fields, potato fields and wheat fields. Based on analyzing factors of aggregation Taylor method was used to obtain theoretical sampling model of the eggs.
出处
《山地农业生物学报》
2000年第1期30-32,共3页
Journal of Mountain Agriculture and Biology
关键词
小地老虎
卵
空间分布
抽样技术
地下害虫
Agrotis ipsilon
eggs
bioenviromnent
space distribution
sampling theory
