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【目的】分析天敌蜘蛛对假眼小绿叶蝉空间跟随关系的密切程度及抽样样方的大小,为评价假眼小绿叶蝉的天敌优势种和确定样方大小提供科学依据。【方法】用聚块样方方差分析法、灰色关联度分析法、扩散系数法和ρ指数法,对潜山县茶园假眼小绿叶蝉及其8种蜘蛛类天敌空间跟随关系的密切程度、种群聚集的原因和个体种群聚集时占据的最小面积进行分析。【结果】与假眼小绿叶蝉空间跟随关系密切的天敌是八点球腹蛛、三突花蟹蛛和斑管巢蛛,其关联度值分别为0.812 0,0.768 1和0.757 2,跟随关系较不密切的天敌是鞍形花蟹蛛,二者的关联度值为0.645 9。在聚块内有1~8个基本样方时,随着聚块内基本样方数的增多,聚集格局的扩散系数(C值)不断增大,均匀格局和随机格局的扩散系数不断减小。假眼小绿叶蝉及其天敌在聚块基本样方数为2,4,8,16和32时的空间分布聚集程度与聚块基本样方数为1时差异均不显著。假眼小绿叶蝉的种群聚集均数λ均大于2,表明聚集是由其本身原因造成的,在种群聚集均数为正值时,随着聚块内基本样方数的增加,种群聚集均数不断增大。假眼小绿叶蝉个体群聚集格局的最小面积是聚块中有1个基本样方,即面积不小于1.7m2。【结论】采用聚块样方方差分析法、灰色关联度分析法、扩散系数法和ρ指数法,不仅可以判别天敌与害虫空间跟随关系的密切程度,而且可以科学确定抽样样方的最小面积,是较为理想的空间格局分析方法。
【Objective】 The objective of this study was to analyze the close relationship between the natural enemies spiders and the size of sampled quadrats, and provide scientific basis for evaluating dominant species of natural enemies and determining the size of quadrats. 【Method】 By using the method of cluster analysis of variance, gray relational analysis, diffusion coefficient and ρ exponential method, the close degree of spatial follow-up relationship between the green leafhoppers and their 8 kinds of spider natural enemies in tea plantation of Qianshan County was studied. The reason for population aggregation and the smallest area occupied by individual populations when aggregated are analyzed. 【Result】 The results showed that the natural enemies closely related to the spatial order of the green leafhopper (Pythium cicadae) were eight-spotted spider, three-spotted crab spider and spotted nest-spider. The correlation values were 0.812 0,0.768 1 and 0.757 2 respectively. The less natural enemies are saddle-shaped crab spider, the correlation between the two values is 0.6459. When there are 1 to 8 basic quadrats in the poly-block, as the number of basic quadrats in the poly-block increases, the diffusion coefficient (C value) of the aggregation pattern continuously increases, and the diffusion coefficient of the uniform pattern and the random pattern decreases . There was no significant difference in the spatial distribution of congregate quadrats when their basic quadrats were 2, 4, 8, 16 and 32, respectively. The population aggregation mean λ of the green leafhopper is greater than 2, indicating that the aggregation is caused by its own reasons. When the population aggregation mean is positive, with the increase of the number of basic quadrats in the polygon, the population aggregation Increasing number. The minimum area of the aggregation pattern of individuals in the green leafhopper is one basic quadrat in the polychrome, that is, the area is not less than 1.7m2. 【Conclusion】 The method of cluster analysis of variance, gray relational analysis, diffusion coefficient and ρ exponential method can not only determine the close relationship between the following relationship of natural enemies and pests, but also determine the minimum area of sampling quadrats, Is the ideal spatial pattern analysis method.