Preliminary Study On The Insect Diversity In Longwan National Nature Reserve

In this paper, by systematic and random sampling method, the author systematicallyinvestigated the insect species and quantities in seven different communities (Jinchuan peatwetland, Korean pine mixed forest, Abies mixed forest, Mongolian oak forest, Forestedwetlands, Broad-leaved mixed forest, Farmland) of the Longwan National Nature Reservefrom May to October in2011, and the night activity moths were collected with black lighttraps. Supplement survey were in July2012. Preliminary study was conducted on the insectdiversity.The study includes: analysed Longwan National Nature Reserve insect communitystructure; the dominant insect species were analysed in different habitats; with the change oftime the diversity of insect communities showed a dynamic law and researched the dominantorders insect community in different habitats similar.After identify, clear up and analyse the data, the rusults are as follows.(1) In seven representative habitats of the Longwan National Nature Reserve, accordingto the statistical analysis and identification,329species were collcted which belong to10orders,81families,255genera. Analysis from the families and species for the quantity, theresults showed that Lepidoptera>Coleoptera>Diptera>Hymenoptera>Orthoptera. The familyof the five orders insects accounted for88.89%, and the species of the five orders insectsaccounted for93.62%, it showed that these five orders were dominant. Then other orders tookup a small proportion.(2) By analysed the advantage ordes insects community composition and compareddifferent dominant species in different habitate, we can see the insect composition anddominant species has significant differences in different habitats.(3) By using species richness, diversity, dominant concentration, species evenness tostudy the insect diversity of the different habitats with the change of time, it showed that indifferent habitats, development and fadeaway of different kind of insect are significantdifferences; insect community structure affected by the climate in different time, and it will bechanged in the same habitat; the same time in different habitats, the insect communitystructure and vegetation composition of their habitats showed regularity of change; invegetation rich habitats, the insect community composition is more complex, and the diversityindex is higher. Therefore, it can be drawn that flexibility exists among the diversity of insectcommunity structure, surrounding environment of insect and climate change. These diversityindices have differences in different time periods, and have certain variation; the richness anddiversity curve trend similar in different habitats, and then species evenness and dominance concentration curve trend opposite in different habitats.(4) The similarity analysis of advantage orders in the different habitats of the LongwanNational Nature Reserve was made, and the results showed that Korean pine mixed andForest wetlands similarity coefficient is higher, to achieve a medium similar level; theBroad-leaved mixed forest achieve extremely dissimilar(q<0.25) with both Farmland and theJinchuan peat wetlands habitat; the other habitats simillarity coefficient achieve last dissimilar.It was obvious that there are significant differences in selected representative habitats, and itis an important prerequisite to ensure the insect community diversity.