摘要
桉树枝瘿姬小蜂是福建省新发现的外来入侵危险性害虫,为给该虫的虫情监测和预测预报提供科学依据,应用地理统计学的方法,对该虫虫瘿的空间格局进行了分析。结果表明,虫瘿在林间呈聚集分布,空间聚集范围在7.377 8-10.462 6 m之间;虫瘿个体间相互排斥,且疏散在较大的斑块内。分别以1 m×1 m、2 m×2 m、3 m×3 m、5 m×5 m、6 m×6 m的样方划分样地,并结合虫瘿林间克里格插值估计结果,发现南→北方向上的相关距离均大于东→西方向,当间隔距离0-10 m时,变异函数值随距离的增加而变大,当间隔距离超过10 m时,变异函数值随距离增加而减小。说明南→北方向是虫瘿种群聚集和扩散的主要方向,成虫为获取最适宜其后代生存和繁殖的环境因子或自然资源的供应,聚集在一起产卵且又保持相当的距离,以保证后代的食物和资源的平衡。
Leptocybe invasa Fisher et La Salle is a newly discovered dangerous pest in Fujian Province.For an offering of scientific basis for the monitoring and prediction of L.invasa,geostatistical methods were applied to measure and analyze the spatial pattern of the galls of L.invasa.The results showed that the galls spatial distribution was of aggregated type,spatial range of aggregation fluctuated from 7.377 8 m to 10.462 6 m in all the sampling sites.The galls individuals were exclusive,and evacuation in large plaque.The plots were measured and divided with different guadrat sizes at 1 m×1 m,2 m×2 m,3 m×3 m,5 m×5 m,and 6 m×6 m,combined with the result of Kriging spatial pattern of galls.It was found that the relative distances in the orientation from south to north were all more than thoes from east to west.The variation function value raised with the increase of distance between two eucalyptus galls,when it within 10 m.But the variation functoin value decreased wth the distance which was longer than 10 m.It has been proved that the pest population dispersed and aggregated mainly in south-north orientation.To abtain the best habitats and food supply for their offsprings living and multiplication,the adults oviposit clumped with a certain distance among them to balance the benefits of aggregation and the competions for food and other resources.
出处
《福建林学院学报》
CSCD
北大核心
2013年第2期183-187,共5页
Journal of Fujian College of Forestry
基金
福建省科技厅重点科技基金资助项目(2012N0008)
关键词
桉树枝瘿姬小蜂
虫瘿
空间分布
地理统计学
Leptocybe invasa
eucalyptus galls
spatial patterns
geo-statistics
