云南锦斑蛾幼虫空间分布型及抽样技术

摘要

云南锦斑蛾是云南樱花的一个重要食叶害虫, 为揭示其幼虫的行为、 习性及活动规律以及确定其在林间的适宜抽样调查方法. 应用聚集度指数法、 线形回归方程检验法、 频次分布检验研究探讨了云南锦斑蛾的空间分布型及抽样技术. 结果表明, 云南锦斑蛾的空间分布型属聚集型的负二项分布. 在了解云南锦斑蛾空间分布型的基础上, 利用Iwao的m*-m回归方程, 建立了精度为0.1和0.2时的理论抽样数表, 在幼虫为1头/株、 2头/株、 4头/株时, 其累计虫口数的上、 下限分别为485和121, 274和69, 169和42. 利用Iwao提出的序贯抽样模式制定列出序贯抽样表. 为野外抽样调查、 密度估计及预测预报提供了依据.%Achelura yunnanensis is a serious defoliator of the Cerasus spp..To reveal its larvae's behavior, habits and activity patterns and determine appropriate sampling method among the forest, relevant methods such as the ag-gregation indices, liner regression analysis and comparative frequency were used.The results showed that its spa-tial distribution pattern fitted in a negative binomial distribution and belonged to the aggregated distribution .On the basis of understanding the spatial distribution pattern of the Achelura yunnanensis, and by using Iwao m*-m regres-sion equation, a theoretical sampling list with precision of 0.1 and 0.2 was set up.The upper limit and lower limit of accumulated larvae for 1, 2 and 4 larvae per tree were 485 and 121, 274 and 69, 169 and 42 respectively.A sequential sampling list was proposed based upon Iwao' s s sequential sampling mode in this paper, and it could provide some references on field sampling survey and density prediction .