菱角萤叶甲种群空间格局研究  

Spatial distribution pattern of water chestnut beetle(Galerucella birmanica Jacoby)

作　　者：郑福山[1] 杜予州[1] 卢艳阳[1] 强承魁[1] 丁建清[2] 

机构地区：[1]扬州大学应用昆虫研究所,扬州225009 [2]中国科学院武汉植物园,武汉430074

出　　处：《中国生态农业学报》2006年第4期171-175,共5页Chinese Journal of Eco-Agriculture

基　　金：美国康奈尔大学资助项目"菱角生物防治"资助

摘　　要：运用2种回归方法和9个聚集度指标对菱角萤叶甲(Galerucella birmanica Jacoby)各虫态的空间格局进行了研究。结果表明,菱角萤叶甲在菱塘基本呈聚集分布,低密度趋向均匀分布,分布的基本成分是个体群;此外,利用空间分布型参数估计个体群的大小(L*)和平均密度(-x)的关系为L*=17.7117+1.5701x-;应用x-=kc(P0-1/kc-1)模型探讨了无虫株率与平均密度的关系,表明实际生产中可应用此模型仿测田间种群密度。同时运用λ参数对聚集原因进行了分析,发现种群的生物学特性和菱角植株的生长状况是影响种群聚集的两个主要原因。Two regression models and nine indices of aggregation [ K, C, CA, I, I,, M^＊ , M^＊/-x L^＊ , L^＊/（ 1 ＋ -x ） ] were used to test the spatial distribution patterns of population of Galerucella birmanica Jacoby in the water chestnut fields. The results indicate that the distribution patterns belong to an aggregated distribution and incline to an even distribution at a low density. The beetles occur in the loose colonies. The regression relation between the size of individual group （L^＊ ） and the average density （x） is L^＊ = 17.7117 ＋ 1.5701-x. The testing result of using the model, -x=kc（P0^-1/kc-1 ）, to analyze the correlation between the rate of insect-free plants and average intensity shows that this model is practical to estimate the average intensity of insects in fields. The reason for the aggregation has been analyzed with Blackith＇s λ. The result shows that their aggregation seems to be due to both the biological characters of population of beetles and the growth of water chestnut.

关 键 词：菱角萤叶甲 菱角 聚集度 空间格局 聚集原因 

分 类 号：S436.45[农业科学—农业昆虫与害虫防治]