Abstract: By means of non-flooded petri dish method and in vivo observation, the community characteristics of soil sarcodinid and flagellate in Taohuagou Forest Park (including Taohuagou and Puduxia scenic areas) and Fujiatan (an area with heavy human disturbance) in Xiaolongshan Mountains of Gansu province were studied from August 2004 to July 2007. A total of 75 species were identified. In Taohuagou Forest Park, there were 69 species belonging to 33 genera of 22 families from 10 orders in 4 classes, among which, 58 species were found in Taohuagou scenic area, and 33 species in Puduxia scenic area. In Fujiatan, 22 species were found. Chrysomnadida, Kinetoplastida, and Amoebida were the dominant orders, and Acanthamoeba astronyxis, A. polyphaga, Oikomonas termo, Bodo globosus, B. ovatus, and Spumella amoebina were the dominant species in Taohuagou Forest Park; while Euglenida, Chrysomnadida, and Kinetoplastida were the dominant orders, and B. ovatus was the dominant species in Fujiatan. The Gleason-Margalef species diversity index in Taohuagou and Puduxia scenic areas of Taohuagou Forest Park and in Fujiatan was 6.60, 4.00, and 3.20, respectively, and the Jaccard similarity index was 0.32 between Taohuagou scenic area and Puduxia scenic area, 0.18 between Taohuagou scenic area and Fujiatan, and 0.20 between Puduxia scenic area and Fujiatan. The results showed that in Taohuagou Forest Park, the species of soil sarcodinid and flagellate were abundant, including a large number of endemic and rare species, the community structure was complex, and the species composition was unique. It was indicated that there were great differences in species diversity and community structure of soil sarcodinid and flagellate between intact and disturbed environments.

Key words: Hydrological model, Precipitation, Spatial distribution