Study On Community Structure Of Grasshoppers From Ecological Restoration In The Hilly And Gully Area Of Loess Plateau Of Yan'an

In order to understand the community structure of locust in Yanan loess hilly-gully region,this paper used the diversity index formula to process and compare the data collected through capturing and observation of locust in Yanan of different types of recovery,recovery place and recovery duration to provide the basis for the local ecological environment protection and locust control.The data collected are compared as follows:1.The majority of locust species in Yanan are Atractomorpha sinensis,oedaleus infernalis,and Chorthippus albonemus.Among different restoration types,the artificially restored forest had the largest number of species of locust,followed by natural restored grassland.Zidan county had the largest number of locust species in different counties.In different recovery years,the most species of locusts were in those that have been restored for 11 years,indicating that the longer the recovery time is,the more abundant the vegetation is,and the more species of locusts there were.2.According to the different behaviors,locusts have different dynamic.Some locusts develop early while some develop late.The early developed locusts in Yanan region include Oxya chinensis,Pararcyptera microptera meridionalis and so forth.The late developed locusts are Epacromius coerulipes,oedaleus infernalis,etc.Locust occurrence can be predicted according to locust occurrence dynamics.3.Distribution of locusts in Yanan has its own characteristics.Among different restoration types,the artificially restored forest had the highest richness index and natural recovery grass had the highest diversity and evenness index when farmland had the highest dominance index;The diversity index and evenness index of Zhidan county were the highest in different counties,so was its richness index when the superiority index was the highest in Ganquan county.In different years of recovery,recovery of 11 years had the highest diversity index and richness index.Recovery of 7 years had the highest evenness index and recovery of 5 years had the highest dominance index.Diversity index was positively correlated with evenness index and negative correlated with the dominance index.4.Most of the locusts in Yan'an are the Palaearctic Region species.