摘要
本文通过调查5块水曲柳标准地,采用6种不同的判断空间分布格局的聚集度指标和Iwao,Talor等回归分析法对柳蝙蛾幼虫的空间分布型进行了研究。结果表明:柳蝙蛾幼虫的空间分布型为聚集分布,聚集的原因是由害虫本身的生物学特性和环境因子共同作用所造成。在此基础上建立了林间理论抽样数公式为N=t2(1.003/m+0.1566)/D2,为柳蝙蛾的调查取样和预测预报工作提供了依据。
The spatial distribution pattern of Phassus excrescens larvae was examined by 6 aggregation indices and regression analysis methods of Iwao, Talor in 5 standard plots of Fraxinus rnandshurica. The results showed that P. excrescens larvae was in aggregative distribution and the aggregation was caused by both the insect＇s biological characteristics and the environmental factors. The optimum theoretical sampling number was established. The model was as follows. N=t^2 （1. 003/m＋0. 156 6）/D^2. It provided the base for sampling and forecasting of P. excrescens .
出处
《西北林学院学报》
CSCD
北大核心
2009年第4期140-142,共3页
Journal of Northwest Forestry University
基金
哈尔滨市科技局攻关项目"哈尔滨主要园林病虫害防治应用技术研究"(2006AA9BS144)
关键词
柳蝙蛾幼虫
空间分布型
抽样技术
Phassus excrescens larvae
spatial distribution pattern
sampling method
