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从60年代起国外广泛采用种群聚集度指标来测定昆虫的空间分布型。种群聚集度指标描述了昆虫种群生物学特性对环境条件适应和选择的情况。前人提出了许多测定昆虫种群集度的指标,其中Lloyd(1967)提出的平均拥挤度(mean crowding)是昆虫生态中空间分布型测定一种较常用的方法。其优点能比较直观地反映种群蜜度和其分布规律,而且在统计过程不受零样方的影响。国内近年来有关昆虫空间分布型的研究也都采用平均拥挤度等
Since the 1960s, the population concentration index has been widely used abroad to determine the spatial distribution of insects. The index of population aggregation describes the adaptation and selection of the biological characteristics of insect population to environmental conditions. Many predecessors have put forward a lot of indicators to determine the concentration of insect populations. The mean crowding proposed by Lloyd (1967) is a more commonly used method for the spatial distribution of insects. Its advantages can more directly reflect the population honey degree and its distribution law, and the statistical process is not affected by the zero sample. In recent years, the research on spatial distribution of insects in China has also adopted average crowding