The function of several slime-forming bacteria on the formatio n of soil water- stable aggregates
几株产荚膜细菌在土壤水稳性团聚体形成中的作用

The function of several slime-forming bacteria on the formation of soil water-stable aggregates was studied.The results show that the bacteria significantly promote the formation of soil waterstable aggregates(>0.25mm).The secondary metabolites rather than the cells play a more important role in promoting soil aggregate formation.The stimulating effect changes with the supply of different organic materials.Sucrose as a sole carbon resource of the bacteria,much better than either wheat or corn straw,gives a highest soil waterstable aggregates(>0.25mm).Loenardite does not have a significant promoting effect on the aggregate formation.There are obvious differences in promoting aggregate formation by the bacteria with adding different carbon resources.