园林绿地中桔小实蝇种群消长与环境因子的相关性

为掌握桔小实蝇Bactrocera dorsalis(Hendel)种群在上海园林绿地中的消长与环境因子的相关性,采用成虫诱捕法监测10个园林绿地内的桔小实蝇种群发生量;采用人工调查法调查绿地内桔小实蝇寄主植物的种类和数量、种群发生点到餐饮场所、垃圾站及水果市场距离、绿地内日平均气温和日平均相对湿度等环境因子。调查分析结果显示,桔小实蝇的种群发生量与寄主植物数量的相关系数为0.938,呈极显著正相关,表明寄主植物数量是影响桔小实蝇种群发生量的最重要因子;桔小实蝇种群发生量与该种群发生点到水果市场距离的相关系数为-0.996,呈极显著负相关,表明水果市场与寄主植物距离越远,种群发生量越小。聚类分析结果显示,桔小实蝇种群发生量与该种群发生点至垃圾站的距离聚为一类,两者又与种群发生点至水果市场的距离聚为一类,桔小实蝇种群发生量与水果市场、垃圾站的距离具有相关性。

The population dynamics and the correlation with environmental factors of Bactrocera dorsalis

To understand the factors affecting the population dynamics of the Oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae) in Shanghai landscape green spaces, we inspected the population level with the entrapment method of adult fruit fly, and using the laborious survey research we investigated 7 influencing factors including host plant species, quantity, the distance between living places of population and food facilities, garbage stations, fruit markets, average air temperature and average relative humidity per day. The results indicated that the correlation coefficient between the population level and the host plant quantity was 0.938, they were positive correlation. The host plant quantity is the most important factor affecting the population level of the Oriental fruit fly. The correlation coefficient between the population level and the distance between living places of population fruit markets is -0.996, they were significantly negative correlation, these showed that the far the distance between fruit markets and the host plants, the less the population level. The cluster analysis demonstrated that the population level and the distance between living places of population and garbage stations was classified into one class, and they were grouped into one class with the distance between living places of population fruit markets. The population level was related to the distance between living places of population and garbage stations, fruit markets.