【摘要】 通过设置20 m×30 m标准调查样地,调查了样方内油松的株数、红脂大小蠹的侵入孔数,根据侵入孔与坑道内卵、幼虫、蛹的比率确定了每坑道中相应虫态的数量。以分布型指数确定红脂大小蠹的分布型结果表明,该虫成虫在树干上的蛀入孔、坑道在林分内的空间分布格局为聚集型中的负二项分布,其自然集群可区分为I型即新建群体、II型即增长危害期的群体、III型即扩散危害期群体,各型的株均坑道界限值分别为0.0~1.1、1.5~3.0、4.0~6.5。同时,采用标准差法研究治理红脂大小蠹危害或有效治理后进行监测时防治指标表明,该害虫的治理及监测指标可划分为控制、基本扑灭、基本铲除3个类型。更多还原

【Abstract】 The number of pines and invaded pores of Dendroctonus valens on them in each sampled plot(20 m×30 m) were investigated and the populations of egg,larva and nymph in each cavity were accounted respectively.The study of distributing index showed that the invaded pores and cavities of D.valens were aggregated negative binomial distribution,and their nature colonies could be divided into 3 types: type I(new inhabited type), type II(increasing disserving period type) and type III(pervading disserving period type).The critical cavities per tree of each type above were 0～1.1,1.5～3.0,4～6.5.Meanwhile,the results of control and survey study after effectively controls showed that 3 types of controlling and survey index could be recognized: controlled-type,nearly controlledtype and nearly exterminated-type.更多还原