CAJ | 학술논문

The spatial distribution patterns of Basilepta melanopus adults in Camellia oleifera ( tea oil camellia) young forests of three different ages were studied using aggregation index examination and regression analysis. Correlation, multiple linear regression and path analyses were carried out on the relationships between eight environmental factors and the aggregation number of the leaf beetle on tea oil camellia. The eight environmental factors included slope ( PD) ,slopes aspect (PX),slope position (PW),vegetation coverage (ZB),and host plant basal diameter (DJ),height (GD), crown width ( GF) ,the distance from nearby old forests ( YJ) . Results indicated that the spatial distribution patterns of B. melanopus adults were aggregated in C. oleifera young forests of different ages,i. e. ,common negative binomial distribution in 1-year-old young forest and tended toward Neyman type A distribution in 3-year-old and 5-year-old young forests. In the young forests,the aggregation of the beetle was caused by environmental conditions. The results of multiple linear regression and path analyses showed that the number of environmental factors influencing distribution of the beetle populations tended to decrease with increasing age of young forest. The YJ and GF were the main environmental factors influencing the aggregation number of the beetle on tea oil camellia. With the increased age of young forest,influence and direct path coefficient of YJ gradually decreased,contrarily,GF become the leading factor in 5-year-old young forest. Migration and dispersal behaviors of B. melanopus adults in young forests were discussed,and the management approach of logging old forests may be necessary to prevent the beetle population from spreading throughout nearby young forest.