荒漠景观下柠条豆象对寄主植物的斑块格局空间反应研究
首发时间:2009-12-14
摘要:柠条豆象是危害柠条种子的主要种实害虫之一。本文应用了多个聚集度指标和回归分析方法,研究探讨了柠条豆象在宁夏盐池、灵武等荒漠景观中11个生境斑块中的空间分布型及种群发生情况。结果表明,柠条豆象卵、幼虫在各种生境中均呈聚集型的负二项分布,聚集主要由环境因素引起,个体间相互吸引,有密度依赖性, 聚集强度随种群密度的升高而增加。柠条豆象的种群发生与寄主植物分布斑块格局有着密切的关系,与斑块面积关系不明显。通过主成分分析显示柠条生长的土壤类型、生长方式是影响柠条豆象的发生主要因素。
关键词: 柠条豆象 空间分布型 聚集度指标 寄生率 景观格局
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Population Dynamic and Spatial Distribution Pattern of Kytorhinus immixtus in Different Patches of Desert Landscape Pattern 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 analyzed according to estimation by mean aggregation (λ). The aggregation was caused by landscape pattern. Through the principal components analysis showed that the soil types, survival type of Caragana forest are major factors affecting the occurrence of Kytorhinus immixtus which no significant relationship with patch area.
Keywords: Kytorhinus immixtus spatial distribution pattern aggregation indices autoeciousness ratio landscape pattern
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