Studies On Community Structure And Nicheof Arthropod In Longan Orchard

The longan community of phytophagous insect, Scavenger , predator insect, parasitic insect and spider consisted of 21 orders 127 families 334 species , of which phytophagous insect 8 orders 69 families 159 species , pest 66 species and among them , Japananus sp. and Typhlocybinae are two new pests ; Scavenger 4 orders 9 families 9 species ; predator insect 7 orders 20 families 47 species ; parasitic insect 1 order 9 families 11 species ; spider 1 order 20 families 108 species . In longan orchard , the main part of arthropod community is Lawana imitata Melichar, Tessaratoma papillosa (Drury ), Japananus sp. , Typhlocybinae , Camponotus variegotus( F. Smith ) , Ph Intel la versicolor (C. L. . Koch), Thr idion xianfengensis Zhu et Song and Chrysso lingchuanens is Zhu et Zhang, and Psoeidae . The totally arthropod community structure is that the number of community species in order is : phytophagous insect ) spider } predator insect ) parasitic insect ) Scavenger; the number of individual in order is : phytophagous insect } parasitic insect ) predator insect ) spider } Scavenger. Species in different stratification communities are somewhat similliar , but the dominant species of some sub-community in different stratification and its numerical structures are dramatically different.Temporal structure classification was made by Hierarchical Clustering Method and diversity of different sub-community at vary temporal and spatical structures was analyzed .The results showed the occurrence time of phtophagous insect was classified three seasons : winter-spring ,summer , and autumn . And spiders' occurrence time are classified first half of year and second half of year . Diversitis among sub-community were obviously different . Of which spider was the highest, phytophagous was second .Spider community's amount was great and fluctuated gently . Moreover , its resist to interference was higher.Niche analysis of dominant species showed ,the hypervolume niche breadths of different species are different dramatically , of which Phintella versicolor (C.L..Koch) was the highest ,the hypervolume niche overlaps all are higher , of which between the pests: Typhlocybinae and Japananus sp. ; the natural enemies and pests: Rhene biembolusa Song et chai and Monolepta occifluvisGressitt et Kimoto; the natural enemies : Thridion xianfengensis Zhu et Song. and Chrysso lingchuanensis Zhu et Zhang. all were highest.The paper analyzed the time and spatical structure , numerical dynamic of each sub-community and the predators' natural control function to the pest in two longan orchard . The study reveals : longan orchard is a relatively stable secondary system . In which , biotic community structure is complicated , species is abundant , the natural enemies which species takes arthropod community's totality 49.71% and individual number takes totality 67.49% , are important natural enemy resources . We should study them further and protect them and take advantage of them .