关键词: 土壤微生物, 季节动态, 科尔沁沙地

Abstract: The experiment of seasonal dynamics on the numbers of soil microbes including aerophile bacteria, actinomyces, fungi and spore forming bacteria was conducted in different types of soil, such as shifting sand dune, semi fixed sand dune, fixed sand dune, and two types of farmland soil in the southern part of Horqin sandy land. Trends of changes on different soil microbes with seasons and soil types were also discussed. Results showed that there are clear differences among four soil microbe groups with the change of seasons.The spring growth peak is found in the group of actinomyces and spore forming bacteria. The growth peak of fungi is on summer. And for aerophile bacteria, its growth peak appeard on autumn. In addition, numbers of soil microbes change remarkably with soil types. Clusteringly, the relationships can be classified with three types: farmland type, type of fixed and semi fixed sand dune, and type of shifting sand dune.

Key words: Soil microbe, Seasonal dynamics, Horqin sandy land