摘要
为调查云杉树叶象幼虫在云杉S2-2、S2-3、S2-4苗龄型苗木上空间分布型及开展抽样技术调查研究,在云杉苗木中共设置了30块样地对该幼虫进行了调查。通过应用数理统计方法分析后得出:该幼虫有虫株率分布在云杉S2-2苗龄型苗木上呈对数函数分布趋势;在云杉S2-3、S2-4苗龄型苗木上呈指数函数分布趋势。应用聚集指标法分析得出:该幼虫空间分布型属聚集分布,并通过Iwao回归分析法和Toylor幂法则分析得出,云杉S2-2、S2-3苗龄型苗木上的幼虫个体间相互排斥;云杉S2-4苗龄型苗木上的幼虫个体间相互吸引。同时,应用Iwao的m*-m关系和序贯抽样方法,确定出了该幼虫的理论抽样数及抽样上限值和下限值。
The investigation on larva of Phyllobius sp. was made in the paper through deploying 30 sample plot on the type of S2-2,S2-3,S2-4 seedlings of Picea asperata. The statistical analysis indicated： on the type of S2-2 seedling of Picea asperata, the trees with larva of Phyllobius sp. represented the distribution trend of logarithmic function, whereas on the types of S2-3.S2-4 seedlings, the tree with larva of Phyllobius sp. was exponential function distribution. The determined result of eongregative index method showed that the spatial distribution type of the larva was eongregatlve distribution. The result of Iwao regression analysis and Toylor power theorem analysis indicated： the individuals of larva on the S2-2.xS2-3 seedlings excluded mutually, while attracted mutually on the S2-4 seedling. At the same time, the theoretical sampling number and its upper limit ＆ lower limit were determined with m^＊-m relationship of Iwao and sequential sampling method.
出处
《甘肃林业科技》
2007年第3期4-8,共5页
Journal of Gansu Forestry Science and Technology
关键词
云杉树叶象
空间分布型
抽样技术
Phyllobius sp. of Picea asperata
the pattern of spatial distribution
sampling techniques
