关键词: 科尔沁沙地, 植物萌动期, 土壤微生物, 生态因子, 区系特征

Abstract: The research is about the characteristics of microbe flora in 0—50 cm soil layers and their relationship with ecological factors in different dunes during plant germination period in Horqin Sandland. The results show that the microbe activity in fixed dune>that in semi-fixed dune>that in semi-mobile dune > that in mobile dune; the amount of microbe in any dunes is that the amount of bacteria>the amount of actinomyces>the amount of fungi. The vertical distribution of microbe numbers shows: the least in the upper layer and the most at the 30—40 cm layer in the mobile dune; relatively less variant in every soil layer in both the semi-mobile dune and the semi-fixed dune; the most in the surface layer and less variant in below surface layers in the fixed dune. The microbe number has positive relationship with electronic conductance, with plant coverage density, with litter content and with dune stabilized degree (P≤0.01). The soil pH value has the most influence on actinomyces, the second on bacteria, and the least on fungi. The ground temperature has little effect on soil microbe activity in early May, whereas soil moisture has an obviously negative relationship with the activity of microbe. The main ecological factors that play important role on soil microbe activity include plant coverage density and soluble inorganic salinity during the plant germination period in Horqin Sandland.

Key words: Horqin Sandy Land, germination period, soil microbe, ecological factor, flora