of SRB remained stable with continuously increasing in soils with
SRB. Chloride ions exhibited no significant effect on the survival of
SRB because of the microbicide in soils without SRB [24].
From Fig. 3 it can be seen that the redox potential (Eh) decreased
with increasing chloride ion concentration which means that chloride
ion enhanced the activity of SRB in soils. This also shows that
the dissolved oxygen in soils decreased with increasing chloride
ion concentration, which is beneficial to the breeding of SRB.