Investigation On The Diversity Of Pollinators In Two Kinds Of Legume Crops In Korqin District,Tongliao City

Diversity were studied on pollinators of six orders in alfalfa fields and soybean fields in Korqin District,Tongliao City.The species and dynamics of pollinators found in alfalfa fields and soybean fields were investigated,the pollinators diversity of local soybean fields and alfalfa were clarified;and their characteristics and domain pollinators were analyzed.Factors reveal the impact of major pollination on the population dynamics of insects.It can provide basic data for biodiversity conservation and pollinator research in our country,and can also provide reference for local soybean and alfalfa production.Our results showed that there were 95 species of pollinators in 65 genera,30 families in alfalfa field,including 40 species belonging to 9 families,22 genera in Hymenoptera,6 families 10 genera 13 species of Diptera,6 families 15 genera 20 species of Coleoptera,5 families 9 genera 9 species of Lepidoptera,2 families 6 genera 7 species of Hemiptera,and 2 families 3 genera,6 species of Thysanoptera.There were 61 species belonging to 42 genera,23 families in soybean field,including 22 species in 11 genera,6 families of Hymenoptera,12 species in 9 genera,6 families of Diptera,16 species in 12 genera,5 families of Coleoptera,3 genera,3 species in 3 families of Lepidoptera,4 species in 3 genera,1 family of Hemiptera and 4 species in 4 genera,2 families of Thysanoptera.The species composition of the largest number of pollinator insects in each order of the two legume crop fields was very similar,but there were obvious differences between other species.Diversity analysis showed that Shannon-Wiener information diversity index and Simpson dominance index of pollinators in alfalfa field were higher than those in soybean field.The Marglef.richness index and Pielou evenness index of Hymenoptera,Diptera and Coleoptera pollinators in alfalfa field were higher than those in soybean field;the Marglef richness index and Pielou evenness index of Lepidoptera,Hemiptera and Thysanoptera pollinators in soybean field were higher than those in alfalfa field.The results showed that the average density of Hymenoptera and Diptera in alfalfa field was higher than that in soybean field in the same year.And their peak all appeared in the third week of July,and the density peak of Hymenoptera was significantly higher than that of Diptera.The density peak of Hymenoptera and Diptera in soybean field basically appeared in the fourth week of July.The density dynamic changes of Hymenoptera and Diptera pollinators in alfalfa field were stable,while those of soybean field were fluctuant.The regression analysis of different meteorological factors and the density occurrence of main pollinators showed that the density occurrence of Hymenoptera in soybean field was significantly related to the duration of light;and the occurrence density of Diptera was significantly related to three temperature factors in two crop fields.