沙柳木蠹蛾幼虫危害特性及空间格局研究

沙柳木蠹蛾(Holcocerus arenicola)是危害沙柳的一种钻蛀性害虫,给沙柳的生长造成了严重的影响。为有效控制其危害,明确幼虫危害特性和空间格局,笔者利用生物统计学和地统计学方法,对沙柳木蠹蛾幼虫种群在沙柳上的危害特性和空间格局进行了系统研究。生物统计学结果表明:沙柳木蠹蛾主要以幼虫为害沙柳根部,单丛受害沙柳中,幼虫数量达5头以上的占91.2%,且存在不同龄幼虫危害同一丛沙柳的现象;幼虫在沙柳上的分布主要集中在地下根部10~40 cm以内,占78.57%;幼虫的种群密度与沙柳根径大小和分布有一定的关系。地统计学分析表明:幼虫空间分布为聚集分布,聚集点主要在样地的东北和西南,且从这2个区域向其他方向扩散。

Damage Characteristic and Spatial Distribution of Holcocerus arenicola Larvae

Holcocerus arenicola is a boring pest of Salix psammophila, which seriously affects the growth of S.psammophila. In order to effectively control the insect damage characteristics and spatial distribution of H. arenicola larvae population on S. psammophila were analyzed by using biostatistics and geostatistics methods. The results of biostatistics analysis showed that the larvae of H. arenicola distributed on the roots, 91.2% of total S. psammophila samples were found to be damaged by more than 5 larvae; and different age groups of pests can harm the same plant at the same time. 78.57% of the larvae population was concentrated in the roots within 10-40 cm underground; the population density of H. arenicola larvae was related to diameter size and distribution of the root. The results of geostatistical analysis showed that H. arenicola larvae followed an aggregation distribution, and aggregation points were distributed in the northeast and southwest area of the sample plot and then spread to other areas.