Preliminary Study On The Insect Diversity In MoMoGe National Nature Reserve

In this paper , the insect species in Momoge National Nature Reserve were systematically investigated from July to August in 2006 and 2007. Preliminary study was conducted on the insect diversity. The paper mainly studied the insect community structure, dominant orders'insect community diversity and similarity in different habitats, and then catalogued these species.According to the differences of landforms and vegetation types in Momoge Nature Reserve, the environment was divided into 7 representative habitats, Poplar tree, Elm tree, Carex spp.-Deyeuxia angusrifolia, Farmland, Aneurolepidium chinense, Reed and Suaeda respectively. Using the systematic and random sampling method, the author investigated the insect species and quantity, and the night activity insects were collected with blacklight traps. According to the statistical analysis and identification, 268 species and more than 3500 specimens were collected in Momoge Nature Reserve, belonging to 13 orders, 79 families , 213 genera. Analyzing on the level of species quantity , Lepidoptera>Coleoptera>Diptera>Orthoptera> Hymenoptera>Odonata. The species of the six orders'insects accounted for 88.81%, which were dominant orders. Other orders only took up a small proportion.Comparing the distribution of species and quantity of the 6 dominant orders, the author made an analysis of hierarchical cluster to the different habitats. According to the analytical results and the habitat conditions of the reserve, the 7 representative habitats could be divided into 3 types: the first type included Farmland, Elm tree, Reed and Poplar tree; Aneurolepidium chinense and Carex spp.-Deyeuxia angusrifolia belonged to the second type, and the last type was Suaeda. Of the 3 types of habitats, the first type had the superior vegetation condition so the insect diversity was higher than the other two. In the same way, the third type had the inferior vegetation condition so the insect diversity was the lowest.By using different diversity indices (Shannon-Wiener's diversity index, Simpson's index, Pielou's evenness, interspecific encounter probability) to study the insect diversity of the 7 representative habitats, the results showed that the diversity indices of Suaeda were the lowest when analyzing the six orders'diversity as a whole. Furthermore, the results indicated that the diversity indices of Suaeda were the lowest of the three orders (Lepidoptera, Diptera and Orthoptera) when analyzing the insect diversity indices respectively; In Elm tree Coleoptera had the lowest indices; In Carex spp.-Deyeuxia angusrifolia Hymenoptera and Odonata had the lowest indices. It was obvious that different orders'insects had dissimilar choices to inhabit in different habitats.In summary, the author gave some advices about the environmental protection, development and construction of Momoge National Nature Reserve.