Preliminary Study On The Soil Fungi In The Northern Alp Region Of Hengduan Mountains

43 soil samples of 35 plots, located by GPS (Global Position System), were collected from the region of northern alp of Hengduan Mountains of Qinghai-Xizang Plateau. Quantities of fungi, bacteria and actinomycetes were determined with the dilution plate technique. The soil fungi were identified and the correlations between the quantities of microbes and the soil ecological factors which included soil fertility, soil humidity, land-use type and pH were analyzed by using the software of SPSS. According to the quantities, communities and their distribution, the fungi diversity was also studied. Potential which could antagonize to pathogen and decompose cellulose was also analyzed.Among soil microbes, bacteria were predominant, actinomyces were the next, and fungi were the least. Soil microbe quantity was 1.06×10⁷ (cfu·g^-1dry soil) at least. Fungi quantity ranged from6.58×10² to 6.94×10⁴(cfu·g^-1dry soil).At the same plot, There were more fungi in upper(0²0cm) than in deeper soil layers(20⁴0cm). In different regions, fungi quantities from high to low were as follows: Zheduo Mountain(1.62×10⁴ cfu·g^-1 dry soiI)>SongIinkou(0.85×10⁴ cfu·g^-1dry soil)>Que'er Mountain(0.48×10⁴ cfug'dry soil). In different soil textures, clay loam(1.38×10⁴ cfu·g^-1 dry soil)>sand loam(0.62×10⁴ cfu·g^-1dry soil) > loam soil(0.54×l0⁴ cfu·g^-1 dry soil). Fungi quantities in forest land(1.19×10⁴ cfu·g^-1dry soil) were richer than those in grass land(0.60×10⁴ cfu·g^-1dry soil).A total of 515 fungi isolates were collected from the soil in the northern alp region of Hengduan Mountains. Among these isolates, 385 isolates were got in the upper soil layers(0²0cm), and others came from deeper soil layers(20⁴0cm). 25 fungal genera were identified. Among these genera, Penicillium spp., Trichoderma spp., Aspergillus spp., Cladosporium spp., Broomella sp. and Mucor spp. were isolated more frequently at 97.14%, 80.00%, 65.71%, 57.14%, 45.71% and 31.43% in these samples, respectively. Their proportions of quantity were 21.48%, 8.59%, 10.97%, 7.81%, 1.81% and 6.11%, respectively. In addition, yeast was also one of main population, and its quantity percentage and isolation frequency were 68.57% and 23.46%, respectively.Soil fungi quantities were closely correlated with soil ecological factors. At some...