Effect of Exogenous Rare Earths on Microbial Characteristics in Paddy Soil
摘要
An incubation study was performed to elucidate exogenous rare earth elements(RE)influencing on microbial biomass,microbial ecophysiological parameters cmic/corg,metabolic quotient qCO2 and respiratory rate in relation to temporal availability in paddy soil.Six samples were added different concentrations between 0 and 2000 mg*kg-1 REEs in soil.Results show that exogenous RE have slight stimulative effects on microbial indices in paddy soil at low concentration in the early stage after adding RE,while having inhibitory effects at high concentration.The inhibition is strengthened with increasing RE concentration and is weakened with increasing incubation time.Principal component analysis of the BIOLOG data indicates that microbial community structures have changed,carbon sources consumption of microorganisms in paddy soil becomes much more rapid after 8 weeks,and under RE stress,the change of microbial community structures is a long-term effect.