李园和杏园桃一点斑叶蝉与其主要捕食性天敌在数量、时间和空间上的关系

Relationships Among the Quantity,Time and Space Framework of Erythroneura sudra and Its Major Natural Enemies in Plum and Apricot Orchards

采用系统调查的方法获得了李园和杏园桃一点斑叶蝉Erythroneura sudra与其主要天敌的种群数量,并应用灰色系统方法、生态位方法和空间格局强度指标方法分析了该虫和主要捕食性天敌之间的数量、时间和空间关系.结果表明,李园和杏园不同时间桃一点斑叶蝉数量波动大,高峰期分别为7月17日—8月29日、6月20日—8月29日,以李园数量较大.捕食性天敌发生出现2个盛期,即5月初—7月上旬和9月初—10月中旬.关联度分析结果表明,与该叶蝉数量关联度较高的天敌依次是锥腹肖蛸Tetragnatha maxillosa、中华草蛉Chrysopa sinica和草间小黑蛛Erigonidium graminicola,与理想优势种天敌数量关联度较高的天敌依次为中华草蛉、三突花蟹蛛Misumenops tricuspidatus和异色瓢虫Leis axyridis.生态位研究结果表明,与桃一点斑叶蝉的水平和垂直空间生态位重叠度最高的为三突花蟹蛛,相似性指数最高的为草间小黑蛛;草间小黑蛛与桃一点斑叶蝉之间时间生态位相似性指数和重叠指数最高.综合分析,与桃一点斑叶蝉关系密切的前3位的天敌依次是三突花蟹蛛、草间小黑蛛和锥腹肖蛸.

The number of Erythroneura sudra and its major natural enemies in Plum and Apricot orchard was investigated,and the quantity,time and space framework of E.sudra and its natural enemies were further studied by using grey systematic analysis,ecological niche analysis and aggregated-intensity index analysis of spatial patterns.The results showed that the number of E.sudra in Plum orchard was more than that of Apricot orchard,and the peak period respectively from July 17th to Auguest 29th,and from June 20th to Auguest 29th.The number of predators had two peaks,respectively from early May to early July,and from early September to mid-October.The results demonstrated that for the quantity of the correlation order of main natural enemies of E.sudra were Tetragnatha maxillosa,Chrysopa sinica and Erigonidium graminicola while the correlation rank of the ideal dominant natural enemies of E.sudra were Chrysopa sinica,Misumenops tricuspidatus and Leis axyridis.The order of natural enemies holding most highly horizontal niche overlaps indexs with E.sudra was M.tricuspidatus;The order of natural enemies holding most highly horizontal and vertical space proportional similarity index with E.sudra was Erigonidium graminicola;Erigonidium graminicola appeared highly temporal niche similarity index and niche overlaps indexs with E.sudra;The synthetic ranking indicated that the main natural enemies were Misumenops tricuspidatus,Erigonidium graminicola and T.maxillosa.These results could provide significant direction for protecting natural enemies and optimizing control strategies of E.sudra.