昆虫种群流行病的相对聚集性指标与抽样式研究

Relative Aggregation Indices and Sampling Formulae for Epizootic Diseases of Insects

提出适用于昆虫疾病传播方式及其强度分析的相对聚集性指标，它们是发病种群聚集度与复合种群聚集度之比．相对聚集度大，则发病中心明显，疾病水平传播的效应就较强；相对聚集度小，则发病个体分布稀疏，疾病的垂直传播和环境传播效应较为突出．同时，给出了用于昆虫种群流行病田间调查的理论抽样量公式和序贯抽样公式．

The existing theory on spatial distribution of insects was based on the postulate that the environmental carrier is homogeneous and uniform. With the epizootic diseases of insects, however, the gross insect population has various distribution pattern and is the heterogeneous and un uniform environmental carrier to infected insect population. Therefore the existing theory on spatial distribution can not be directly used in epizootic diseases of insects. The relative aggregation indices (RAI) to calculate the transmission mechanisms and strength of insect disease, which were the proportion of aggregative strength between infected insect population and gross ones, were developed in this paper for the insect population. With the increase of RAI, the infestation center tend to be more apparent and the effect of horizontal transmission increases. The effect of vertical and environmental transmission become more important as the decrease of RAI. Also, the optimel sampling formula and sequential sampling formula for insect diseases were developed.