枣步曲幼虫空间分布型及抽样技术的研究

通过ＩｗａｏＸ－Ｘ回归测定，枣步曲幼虫的空间分布为奈曼－Ａ型分布或波松－二项分布，分布的基本成分为致密的个体群，个体群间及个体群内的分布均为随机分布，个体群的面积小于或等于１株树，对于估值抽样提出了两种方案，即整体抽样和层抽样，前者以随机抽样和棋盘式抽样为优，并给出了理论抽样公式，后者以最下层抽样代替整株抽样估计种群密度，可以提高抽样效率，降低抽样费用，且估计精度能达到科研与生产的要求，最后给出Ｉ

STUDIES ON THE SPATIAL DISTRIBUTION PATTERN AND THE SAMPLING TECHNIQUE OF JUJUBE LOOPER LARVAE

Through Iwao regression determine,the spatial distributions on the jujube looper larvae obeys Neyman-A pattern and Poisson distribution,the ba sic component of the distribution is thick colony.The distribution among colony and intra-colony is random,the area of Colony is equal to or less than one tree.Two sets of estimation sampling were advanced,i.e Whole-Tree Sampling and Layer Sampling,the former is advantageous when using random and chessboard sampling,and the formula of theory sampling were presented;the latter can raise sampling efficiency,and reduce sampling cost,and the estimation precision is up to the standard of production and scientific study when it estimates thick of population with lowest layer sampling replacing whole-tree sampling.Finally the sequential sampling dicision models of Iwao were presented.