粗鞘双条杉天牛的危害分布和抽样方法研究  

A study on the distributing of Semanotus sinoauster Gressitt and method of sampling

作　　者：周祖基[1] 杨伟[1] 曾垂惠[2] 杨德敏[2] 叶伟军 邱宗海 李才进 唐祥云 

机构地区：[1]四川农业大学 [2]四川省森林病虫防治试验站 [3]泸县国营林场 [4]沪州市林业局 [5]沪县林业局

出　　处：《四川林勘设计》1999年第1期24-27,34,共5页Sichuan Forestry Exploration and Design

摘　　要：本文采用聚集度指标、频次比较及回归分析方法对粗鞘双条杉天牛在杉木人工纯林的为害分布进行了研究.结果表明,粗鞘双条杉天牛在人工杉木林中为害分布属受密度制约的聚集型分布,其临界密度为m_0=2.5961株/样方;受害株的分布以植株群为基本单元,其形成是由于该天牛扩散活动能力弱,产卵范围比较集中所致.根据回归关系式m=0.6280+0.7905m,可确定随机抽样的理论抽样数θ,θ=t^2/D^2((a+1)/X+β+1),以5种不同的抽样调查方法进行比较,结果以棋盘式和平行线抽样调查的结果精确度最高.This paper made a study on the distributing of semanotus sinoauster Gressitt in the artifical prue plantation of Cunning hamia Lanceolata Hook, by means of indexes of chuster degree, Comparation of frequency and regression analysis. The resuct showed as following :1. Semanotus Sinoauster Gressitt were distributed in cluster,Which was restricted ;by the density,its limitation density was m0=2. 5961N/S, 2. Damaged trees were distributed by the unit of group, which was resumoted from weak Spreading capability and intensive Oviposition sphere. 3. The Sampling number in theory, can be drawn from formulam = 0. 6280 + 0. 7905m 4. Compared with other three Sampling methods, the accuracy of chess - board forms and parallel lines was highest.

关 键 词：天牛 钮鞘双条杉天牛 杉木 抽样技术 危害分布 

分 类 号：S763.712.7[农业科学—森林保护学]