Soil aggregates are the main soil components and significantly influence soil physical, chemical and biological characteristics. The formation of soil aggregates are the joint effects of living and non-living matters, and the microbes are the most active biological factors. As soil microbes reside in aggregates and affect the formation of soil aggregates, the microbe and aggregate are inseparable. Soil microorganism control the fractionation of soil organic matter and the stability of soil aggregates by directly transform or physically intertwine, secretion of organic matter or change the soil hydrophobic property. Meanwhile, the dynamic changes in soil aggregate structure determine soil microbial activities and the fractionation of soil organic matter, making there have coupling interactions among soil aggregate structure, soil organic matter fractions and changes of soil microbial community structure.Firstly, this paper summarizes the roles of soil microbes in the formation of soil aggregates, different type of soil microbes have different mechanism on the formation and stabilization of soil aggregates. Fungi is vital important for the formation and stabilization of large soil aggregate, but the soil polysaccharide derived from the plants and soil microbes are very essential for the small aggregate. Secondly, the variety and distribution of soil microbes are different in different size of soil aggregates, fungi reside in large aggregates, and bacteria mainly distribute in small aggregates. Finally, widely used technologies and methods in studying the microbes in soil aggregates and further research issues were proposed, which would provide supports for future studies.
Ecology and Environmnet