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林业科学 ›› 1995, Vol. 31 ›› Issue (1): 17-22.

• 论文及研究报告 • 上一篇    下一篇

枣步曲幼虫空间分布型及抽样技术的研究*

刘贤谦,师光禄,李世虎,李连昌,张仙红   

  1. 山西农业大学 太谷 030801
  • 收稿日期:1993-09-16 出版日期:1995-01-25 发布日期:1995-01-25

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

Xianqian Liu,Guanglu Shi,Shihu Li,Lianchang Li,Xianhong Zhang   

  1. Shonxi Agriculiural University Taigu 030801
  • Received:1993-09-16 Online:1995-01-25 Published:1995-01-25

摘要:

通过Iwao -${\rm{\bar x}}$回归测定,枣步曲幼虫的空间分布为奈曼一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,即整株抽样和层抽样,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,最后给出了Iwao序贯抽样决策模型。

关键词: 枣步曲幼虫, 空间分布, 抽样技术, 层抽样, Iwao -${\rm{\bar x}}$回归

Abstract:

Through Iwao -${\rm{\bar x}}$ regression determine, the spatial distribution on the jujube looper larvae obeys Neyman-A pattern and Poisson distribution, the basic 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.

Key words: Jujube looper larvae, Spatial distribution, Sampling techniclue, Layer sampling, Iwao -${\rm{\bar x}}$ regression