摘要
通过频次分布X^2检验和七种分布型指数的测定,赤松毛虫幼虫的空间分布型为一般负二项分布,空间分布的基本成份是疏松的个体群,个体群的分布为聚集分布;个体群内的分布为随机分布;个体群的平均大小约为70个个体。
Spatial distribution patterns of pine lappet caterpillar (Dend-rqlimus spectabilis Butler) were measured by Chi-square test of frequency distribution and seven indices of distribution pattern. The results show the followihg aspects: 1) Spatial distribution pattern of pine lappet caterpillar, obeys the common negative binomial distribution, the basic component of spatial distribution pattern is loose colony and the distribution of colony also is aggregative. (2) The intra-colony distribution is random. (3) The mean size of colony is two Chinese pines and equal to about seventy individuals.(4) After transformation with Iwao's method, the seven groups data of eight groups obey normal distribution, addivity of effect and homogeneity of variance, before transformation, the eight groups data are all non-normal distribution, non-additivity and heterogeneity of variance. (5) The aggregative distribution is caused by biological characteristics feeding behavior of pine lappet caterpillar.
出处
《北京林业大学学报》
CAS
1987年第3期223-231,共9页
Journal of Beijing Forestry University
关键词
赤松毛虫
幼虫
空间分布型
频次分布卡方(χ^2)检验
pine lappet caterpillar, spatial distribution pattern, Chi-square test of frequency distribution, indices of distribution pattern
