关键词: 粗鞘双条杉天牛, 越冬成虫, 垂直分布, 回归估计, 森林害虫[49GF]

Abstract: The damaged China fir being regarded as a multiple-stratum structure compsed of 1m stem sections, the spatial distribution Patterns of overwintered adults of Semanotus sinoauster(Gressitt) on the damaged China fir trees was studied with the methods of the aggregation index and frequency comparion. The vertical variation among strata was analysed with the Ma Zhanshan's reinterpreted Taylor's Power Low and the Xu Rumei's improved Iwao's ṁ-m Models. It is concluded that the spatial pattern of overwintered adults on trees is aggregate on every stratum, but the aggregating intensity increases with height. The basic unit of population distribution was individual mass which number decreases with height. According to such a distribution Pattern, we estimated the theoretical sampling numbers and established a regression model between the mean insect density of 0-1m section(x) and the mean insect density of all tree(y), i, e, y=1.4341+1.2541x.

Key words: SEMANOTUS SINOAUSTER(GRESSITT)')">SEMANOTUS SINOAUSTER(GRESSITT), OVERWINTERED ADULT, VERTICAL DISTRIBUTION PATTERN, REGRESSION ESTIMATION, FOREST INSECT PESTS