【摘要】 应用平均拥挤度指标、扩散指数等8种聚集度指标以及Iwao回归模型、Taylor幂法则等方法分析了榆紫叶甲种群空间分布特征,结果表明:榆紫叶甲林内呈现聚集分布特征,并且聚集程度较高;采用包括Iwao回归模型在内的4个回归模型分析都得到相同的结论。采用Blackith(1961)聚集均数法对结果进一步分析表明其聚集原因主要由生物学习性引起。同时,对榆紫叶甲林内理论抽样数和序贯抽样技术进行了初步探讨。更多还原

【Abstract】 Spatial distribution pattern of Ambrostoma quadriimopressum Motschulsky in Heilongjiang Province was analyzed in 8 indexes by methods of Iwao’s regression analysis and Taylor power principle etc.. The results showed that the spatial distribution pattern was aggregative and in a high aggregation level. This conclusion was affirmed by 4 methods of regression analysis including Iwao’s. Further study by Blackith’s (1961) formula showed the aggregation was relative with bionomic of insect. Meanwhile, optimal sampling number and sequential sampling technique were also discussed in this paper.更多还原