柠条豆象卵及幼虫种群动态及空间分布研究
首发时间:2009-10-10
摘要:柠条豆象是危害柠条种子的主要种实害虫之一。应用了多个聚集度指标和Iwao, Taylor的回归分析方法,研究探讨了柠条豆象卵、幼虫在宁夏盐池、灵武等11个样地的空间分布型。结果表明,该害虫的卵和幼虫在田间均呈聚集型的负二项分布。根据聚集均数(λ)测定结果,分析了聚集原因,这种聚集主要由环境因素引起。应用Iwao、Toylar等进行回归分析检验,回归模型的拟合效果良好,表明柠条豆象个体间相互吸引, 分布的个体成分是个体群, 且与密度有关, 有密度依赖性, 聚集强度随种群密度的升高而增加。
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Studies on the Population Dynamic and Spatial Distribution Pattern of Kytorhinus immixtus’s Egg and Larvae in Ningxia
Abstract:Using some aggregation indices, Iwao and Taylor regression analysis methods, we determined the spatial distribution pattern of Kytorhinus immixtus’s egg and larvae in Ningxia . The results showed that its spatial distribution pattern fitted a negative binomial distribution and belonged to the aggregated distribution. The reason for the aggregation was analysed according to estimation by mean aggregation(λ). The aggregation was caused by the environmental factors. Among the regression analysis, the liner related degree of Iwao and Taylor regression model were optimum.
Keywords: Kytorhinus immixtus spatial distribution pattern aggregation indices autoeciousness ratio
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