荔枝蝽卵的空间分布型和抽样技术的研究

用7种聚集度指标对荔枝蝽卵的空间分布状况进行调查与分析,结果表明:(1)该虫卵的空间分布符合负二项分布,其空间图式是聚集的,分布的基本成份是卵块的个体群;(2)荔枝蝽卵在植株上东南西北不同方位的分布数量有所不同,在植株的东南部其卵密度较高,而西北部卵密度较低;在植株垂直方位上的分布以下层枝梢上卵密度最大,中层次之,上部的卵密度最低;(3)最适抽样数N与卵密度数m及相对误差D的关系为N=1/D2(1.8868/m-0.4923)。 

Spatial Distribution Pattern of Litchi Stink-Bugs (Tessaratoma papillosa)

Spatial distribution patterns of litchi stinkbug eggs in litchi orchards were determined with various methods. The results showed that the spatial distribution of the litchi lopper larvae conformed to negative binomial distribution with an aggregate spatial pattern. The litchi stinkbug eggs were found differently distributed in the plant. The basic component of population distribution was individual groups. The litchi stinkbug eggs had higher densities in the southeast part of the tree crown and lower in the northwest part. For vertical distribution litchi stinkbug eggs were found more in lower parts of the tree, less in the middle and the least in higher parts of the tree. The correlation of the suitable sampling value (N) with density of larvae (m) and difference (D) was: N=1/D2(1.886 8/m-0.492 30).