Study On Characteristics Of Soil Fauna Community In The Wetland Of Lhasa River On Qinghai-Tibet Plateau

Qinghai-Tibet Plateau is a special geological unit, it suits to study physical geographical processes. Previous studies all focus on geology, climatology and vertebrates et al, up to date there were no researches on soil fauna in wetland of Qinghai-Tibet Plateau .This research was the first time study on soil fauna in wetland of Lhasa River. Investigation of soil fauna may provide fundamental data for studying biodiversity and its functions. 8 habitats were chosed as our sample plots, by field investigation and experimental measurement, the characteristics of soil fauna community were studied in September 2008 and 2009. A total of 41 groups were gathered by hand and Tullgren funnel, belonging to 3 phyla, 5 classes, 15 orders and 36 families.In the native wetlands, Lumbricidae and Isotomidae are dominant groups; Pseudachorutidae, Muscidae, Actinedida, Gamasida, Cerapotogonidae, Curculionidae, Valloniidae, Oribatida, Sminthuridae and Brachycera are common groups. In the degenerative wetlands, Lumbricidae and Isotomidae are dominant groups; Valloniidae, Gamasida, Curculionidae, Staphylinidae, Actinedida and Sminthuridae are common groups .In 8 studied habitats, Potentilla anseriana + Kobresia pygmaea community had the highest Shannon-Wiener index, Pielou index and lowest Simpson index. Blysmus sinocompressus + Potentilla anseriana community had the lowest indexes and the highest Simpson index.All individuals and groups of soil fauna in 8 habitats had significant differences calculated with One-Way-ANOVA. Both fauna groups and individuals were decreasing with the depth of soil layers increasing and more than 80% fauna were gathered in 0-10cm soil layer. Pearson correlation was used and the results show us that, individuals of macro-soil fauna had less relationship with soil factors(P>0.05); groups of macro-soil fauna were related with rapid available N(P<0.05), but not the other factors. Individuals of micro-soil fauna had relationship with soil rapid available P and soil organic matter(P<0.05), had no relationship with soil rapid available N(P>0.05). Groups of micro-soil fauna were more related with rapid available N and P(P<0.05), and had significant relationship with organic matter, total N and the rate of water content(P<0.01).The characteristics of community we researched in wetland of Lasa River had its own characteristics and less similarity with other regions.