Microbial activity in wetland soils of dry lake in semi-arid steppe

We studied on microbial activity in wetland soils of dry lake of Hui Teng xi le in semi-arid steppe with the reference of typical steppe in semi-arid areas. Microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), basal respiration (BR), potential respiration (PR), microbial quotient (qMB), and metabolic quotient (qCO₂) of soils were used to survey microbial activity . The results showed that: in the successive process of recession in dry lake the soil microbial activity characteristics in wetland tend towards the landward distribution: soil microbial biomass carbon (SMB-C) was the lake bed(HD)<; the lake center(HX)<;the lake side(HB)<;the typical steppe(DT); Microbial biomass nitrogen (SMB-N) was HX<;HD<;HB<;DT; Basal respiration was DT<;HB<;HD<;HX; Potential respiration(PR) was DT<;HD<;HB<;HX; Microbial quotient(qMB) was in 0.7% ~ 1.3%, HD<; HB <; HX <; DT; Microbial metabolic quotient (qCO₂) is DT <;HB<;HX <;HD. We consider that degradation of dry lakes was in the process of evolution; soil microbial activity in this wetland was still in the relatively unstable interference phase.