苇状羊茅草地害虫群落结构特征及时间格局

Community Structural Characteristics and Temporal Pattern of Pests Damaging Festuca arundinacea

为明确苇状羊茅草地害虫群落结构特征及时间格局,为苇状羊茅害虫的综合治理提供理论依据,对黔草2号苇状羊茅草地害虫群落进行了系统调查、多样性分析和特征参数最优分割。结果表明:苇状羊茅害虫有65种,分别隶属于7个目33科,以同翅目(Homoptera)中小绿叶蝉、麦长管蚜发生量最大,相对丰盛度分别为0.153和0.117;6月下旬、7月上旬、7月下旬和8月上旬的多样性指数较高,而4月和9月下旬的多样性指数较低;按时间变化顺序分割为4月、5—6月上旬、6月中旬至8月下旬、9月等4个阶段,分别代表了害虫群落的组建初期、始盛期、持续发展期、衰落期。苇状羊茅草地害虫群落随时序的变化而变化,运用多样性测定群落结构特征,基本上能综合反映出群落结构的整体水平。

The pest community in Festuca arundinacea grassland of Qiancao 2 was investigated and analyzed to understand the structural characteristics and temporal pattern of pest community and to provide the theoretical basis for comprehensive control of pests in Festuca arundinacea grassland.The results showed that there were 65 species belonging to 33 families,7 orders,the occurrence amount of Empoasca flavescens（Fabircius） and Mocrosiphum avenm（Fabricius） was maximum and the relative abundance of Empoasca flavescens（Fabircius） and Mocrosiphum avenm（Fabricius） was 0.153 and 0.117 respectively,the diversity index was higher in the last ten-day of June,the first ten-day of July,the last ten-day of July and the first ten-day of August and the diversity index was lower in April and the last ten-day of September.The early period,early peak period,continuous development period and decline period of pest community was in April,May to the first ten-day of June,the middle ten-day of June to the last ten-day of August and September respectively.Because the pest community in Festuca arundinacea grassland varies with variation of time sequence,the pest community structural characteristics determined by diversity index can comprehensively reflect the overall level of pest community structure.