苜蓿草地步甲混合种群动态的模糊聚类分析

Study on the Mixed Ground Beetle Population in Alfalfa Grassland with Fuzzy Cluster Analysis

[目的]为揭示苜蓿草地步甲混合种群的一般规律。[方法]采用陷阱法对步甲昆虫进行定时、定点的系统调查,利用平均密度(M)、聚块性指标(M*/M)及有虫陷阱率(F)等参数作为指标对苜蓿草地步甲混合种群动态进行模糊聚类分析。[结果]结果表明,苜蓿草地步甲混合种群在时间过程中呈现聚集高峰期、扩散游猎期及种群消退期3种动态类型。[结论]步甲类昆虫是苜蓿草地重要的捕食天敌类群,明确其混合种群的动态规律,有利于实现对步甲天敌类群的保护与利用。

[Objective] The universal law of mixed ground beetle population in alfalfa grassland was revealled in the research.[Method] The dynamic of mixed ground beetle population in alfalfa grassland was systematically investigated with the trap methods,and sampling by periodical time and fixed position,and the average density（M＊/M）,trap rate of parameter was used as index to do fuzzy cluster＇s analysis.[Result] The analysis results showed：the mixed ground beetle population took on three dynamic patterns of crowed peak period,diffused hunting period and subsiding period by time.[Conclusion] Carabus was important natural enemies of predator groups in alfalfa grassland,realizing the universal law of dynamics of mixed ground beetle population was in favor of protection and utilization of ground beetle population