摘要
本文用6种聚集度指标研究了荔枝蝽成虫空间分布型和抽样技术.结果表明:(1)荔枝蝽成虫的空间分布属于聚集分布;(2)荔枝蝽成虫的田间理论抽样数可用n=(1.644)/D^2·x^(-0.98)来估计;(3)荔枝蝽成虫密度在每梢0—1.5头的范围内,其虫梢率与百梢虫量的关系可用γ=238x-15.95来表示.
The spatial distribution pattern and sampling methods for the adult of litchi stink bug (Tessaratoma papillosa Drury) are analysed with six species aggregation indices. The results are as follows: (1)The spatila distribution for the adult of litchi stink bug belongs to the aggregated distribution; (2)Thcoretical sampling numbers of field survey for the adult of litchi stink bug can be estimated by n=(1.644/D^2)·x^(-0.98)); (3)When the population densities range from 0 to 1.5 each shoot, the relation between the percentage of the shoots containing with insects and the numbers of insects of 100 shoots can be estimated by y=238x-15.95.
关键词
荔枝
荔枝蝽
成虫
空间分布
litchi stink bug
spatial distribution pattern
sampling methods
