花曲柳窄吉丁的空间分布

Spatial distribution of emerald ash borer,Agrilus planipennis

2004年4月-9月，在天津市大港区官港森林公园对花曲柳窄吉丁Agrilus planipennis的空间分布和垂直分布进行了调查研究，应用扩散系数（C）等6种指数法分析测定，确定了该虫在林地中的空间分布呈聚集分布，分布的基本成分是个体群。扩散蔓延规律为聚集型扩散。花曲柳窄吉丁幼虫在树干的垂直分布主要区间在50～150cm之间。对幼虫垂直分布与树干高度的关系进行分析，其符合立方曲线，曲线方程为：Y=-5．1429＋17．9437X＋21．6623X^2＋14．545X^2；相关系数R^2=0．915，P=0．013。

The spatial distribution pattern of emerald ash borer, Agrilus planipennis Fairmaire was studied in Dagang Forest Park, Tianjing during summer in 2004. Result suggested that the beetle in ash plantation are in negative binomial distribution, and six indices of spatial distribution revealed that it is of aggregation pattern. Survey of the larvae＇s vertical distribution demonstrated attack was concentrated on ash trunk between 50 to 150 centimetres in the height. An equation describing the attack and ash trunk height position was derived as Y = - 5.1429 ＋ 17.943 7X ＋ 21.662 3X2 - 14.545X^3 with R^2= 0.915. Key words Agrilus planipennis, spatial distribution, vertical distribution