Effect of Exogenous Rare Earths on Microbial Characteristics in Paddy Soil
来源期刊：JOURNAL OF RARE EARTHS2004年第2期
论文作者：曹建华 陈浮 彭补拙 周峰 濮励杰
Key words：microbial biomass; respiratory rate; community structure; paddy soil; rare earths;
Abstract: 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.
曹建华1，陈浮2，彭补拙2，周峰2，濮励杰2
(1.Institute of Agricultural Resources and Eco-Environment,Nanjing Agricultural University,Nanjing 210095,China;
2.Laboratory of Soil and Water Stimulating,Department of Geography,Nanjing University,Nanjing 210093,China)
Abstract: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.
Key words:microbial biomass; respiratory rate; community structure; paddy soil; rare earths;
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