Investigation On Diversity Of Ground-dwelling Beetle In Changchun Jingyuetan National Forest Park

In recent years,in order to build Changchun into a landscape garden city,Changchun municipal party committee and Changchun municipal government have further increased investment.Jingyuetan scenic spot is the core and foundation of urban cultural sightseeing tourism in Changchun.It is a realistic need to strengthen the research of Jingyuetan National Forest park,which provides a theoretical basis and scientific basis for the sustainable development planning of forest ecology around the city,forest management and forest biodiversity protection.Therefore,from May to October 2021,the composition and distribution of Ground-dwelling beetle in typical pinus koraiensis forest,pinus sylvestris forest,black pine forest,Larix fores,Mongolian oak forest,coniferous mixed fores,mixed broadleaved forest and coniferous-broadleaved mixed forest in Jingyuetan National Forest park were investigated by using Babbitt pot lure method.The main research results are as follows:1.Community structure of ground-dwelling beetle in Jingyuetan National Forest parkIn the investigation of 8 types of forests in Jingyuetan National Forest park,a total of 10959 ground-dwelling beetle specimens were collected.After identification,they belong to 17 families,55 genera and 74 species.Among them,the dominant groups of Carabidae account for 90.93% of the whole Ground-dwelling beetle,which belong to 13 genera and 22 species.The common taxa of Jingyuetan National Forest park are Elateridae,Nitidulidae and Scarabaeidae family,Elateridae accounts for3.48% of the whole Ground-dwelling beetle,which belong to 4 genera and 6 species;The Nitidulidae family accounts for 2.15% of the whole surface carapace,belonging to 2 genera and 3 species;The Scarabaeidae family accounts for 1.4% of the whole surface carapace,belonging to 2 genera and 4 species.From the perspective of species,the Amara gigantus,Leptocaraabus kurilensis and Carabus conciliator are the advantages of Jingyuetan National Forest park,accounting for 32.64%,30.83% and22.53% of the whole Ground-dwelling beetle respectively it are the dominant species of Jingyuetan National Forest park.2.Composition and distribution of Ground-dwelling beetle in different stands of Jingyuetan National Forest parkThe distribution of Ground-dwelling beetle in different forest types is quite different.There are many Ground-dwelling beetle in mixed broadleaved forest,Mongolian oak forest,coniferous mixed fores and pinus koraiensis,accounting for27.7%,18.78%,14.08% and 11.68% of the whole Ground-dwelling beetlerespectively.Among them,the distribution of Ground-dwelling beetlein pinus sylvestris forest and pinus tabulaeformis forest is the least,accounting for 2.56% and 3.67% of the whole Ground-dwelling beetle.Seven species of Ground-dwelling beetle,including Amara gigantus,Carabus conciliator,Leptocaraabus kurilensis,Agrypnus argillaceus,Epuraea bickhaldti,Harpalus rubefactus and Onthophagus fodiens,are distributed in8 stands and belong to widely distributed species.3.Diversity of Ground-dwelling beetle in different stands in Jingyuetan National Forest parkGround-dwelling beetle not only have different quantitative distribution,but also have different community diversity in different types of forests,but there is no significant difference in diversity index,dominance index,evenness index and richness index of different stand types.There were significant differences in the quantitative distribution of five main groups in different stands,including Amara gigantus,Carabus conciliator,Leptocaraabus kurilensis,Agrypnus argillaceus,Epuraea bickhaldti.4.Temporal dynamics of Ground-dwelling beetlein Jingyuetan National Forest parkThe number of individuals and species of Ground-dwelling beetlein Jingyuetan National Forest park were significantly different in different months.In August,Jingyuetan National Forest park had the largest number of Ground-dwelling beetleand the largest number of species in May.The dominance index of Jingyuetan National Forest park has the opposite trend with the diversity index,richness index and change.The change trend of diversity index and richness index is similar.The dominance index is the highest in October and the richness index,diversity index and evenness index are the largest in May.5.Temporal dynamics of Ground-dwelling beetlein different stands in Jingyuetan National Forest parkThe variation laws of individual number of surface beetles,species number dominance index,diversity index,evenness index,richness index and three dominant populations of Amara gigantus,Carabus conciliator,Leptocaraabus kurilensis in different stands are different in each month.In the same stand type,the change trend of dominance index,diversity index,evenness index,richness index and three kinds of dominant populations of Amara gigantus,Carabus conciliator,Leptocaraabus kurilensis,are also different.