油茶象甲幼虫发生及空间分布型研究

Occurrence and spatial distribution patterns of Curculio chinensis larvae

基于野外调查数据,应用8种聚集度指标和2种回归模型研究了油茶象甲幼虫种群的空间分布型,应用"聚集度均数"指标分析了幼虫种群聚集的原因,运用SPSS分析软件对幼虫的发生与环境的关系进行分析。结果表明:油茶象甲幼虫种群的空间分布型为聚集分布,且该分布具密度依赖性;幼虫种群空间分布的基本成分是个体群,且个体间相互吸引;幼虫种群聚集分布的原因是由其本身特性及环境因素共同作用造成;油茶象甲幼虫的虫口密度受不同方位的影响不大,受不同高度层次的影响较大,幼虫对下层的危害最为严重,上层和中层的危害相对较轻。

Based on the collected field data, the spatial distribution pattern of Curculio chinensis larvae was tested by 8 types of aggregation indices and 2 types of regression equations, the assembling causes were analyzed with average aggression size, the relationship between its occurrence and environment was analyzed by SPSS. The results showed that, the spatial distribution pattern of the larvae belonged to the aggregation distribution with density dependence. The basic component of larval population spatial distribution was a group of individuals, which attracted one another. The aggregation was caused by both pest＇s biological characteristics and environmental factors. The population density of larvae was less affected by direction, but greater affected by height level. The harm of fruits by larvae was most serious at the lower layers, but less at the upper and middle layers.