【摘要】 <正> 落叶松毛虫(Dendrolimus superans(Butler))发生基地是各种生态因子相互综合影响而形成的落叶松毛虫猖獗发生的生态地理群落,迄今对它做过一些研究,但局限于定性描述。本文将发生基地建立较准确的判别发生的数学模型。更多还原

【Abstract】 In this paper, the incidence site of Dendrolimus superans, an important pest in northeast China, was analysed. Based on the data from 69 stands, amodla to classify the incidence site of this pest (class 1 : the suitable site for the pest; Class 2 : the unsuitable site.) by the ecological factors such as relief, slope direction, gradiend in the stand, was obtained through the application of the theory of quatifieation 2.更多还原