摘要
在大量取样的基础上 ,利用若干聚集度指标法、频次分布卡方检验法对松瘿小卷蛾幼虫空间分布型进行了研究。在落叶松种子园内 ,松瘿小卷蛾幼虫空间分布型为聚集分布 ,分布的基本成分是个体群 ,种群扩散为聚集扩散。在序贯抽样中应用Iwao的序贯抽样公式确定了最适抽样数。
On the basis of vast sampling,the larva′s spatial pattern of Laspeyresia zebeana has been researched through utilizes some index of degree of aggregation and the chi-square test of frequency distribution.In the seed orchard of larch,the spatial pattern of larva is aggregated distribution,the basic component of this distribution is individual group,and the group diffusion is aggregated diffusion.During the sequential sampling,the optimum number of sampling has been confirmed through utilize Iwao′s sequential sampling formula.
出处
《林业科技》
北大核心
2005年第1期21-23,共3页
Forestry Science & Technology
