中文摘要：

采集南方几种重金属污染下的水稻土，通过室内培养的方法研究土壤CO2排放的动态变化以及微生物学指标的差异。结果表明，在60d的培养期内，前7d土壤呼吸速率较高，占了整个排放量的30．89％～64．37％，并且这一阶段重金属对土壤呼吸速率的影响最大。重金属对土壤微生物生物量的影响表现出增加、抑制与无显著性差异的结果，而重金属对微生物熵及微生物代谢熵（qCO2）的影响却是极显著的，同时表现出增加与降低的不同结果。这说明土壤呼吸以及不同的微生物学指标，在长期的复合重金属污染条件下，其表现并不一致，微生物熵与代谢熵用于基本性质差异较大的土壤时，对重金属的响应更为灵敏。此外，土壤重金属的累积还能提高土壤中有机碳的含量。

英文摘要：

Soil samples were collected from heavy metals contaminated paddy fields of south China, the CO2 fluxes and the different variables on microbial indices in high polluted and low polluted soils were investigated under laboratory condition. During 60 days incubation, the rate of CO2 released from soil was high and changed quickly in the first 7days, then came to a steady and lowly rate. The effects of heavy metals on the emission of CO2 from soil were the greatest in the first 7 days, and about 30.89%-64.37% of the total amounts C02-C/OC were released in this period. Soil microbial biomass had a complicated response to heavy metals contaminated in different areas, it could be lower or higher in high pollution soils, nothing differences also be seen between high polluted and low polluted soils. Heavy metals also had remarkably effects on the microbial quotient（Cmic/Corg） and metabolic quotient（qCO2） in these areas, 4 area＇s qCO2 had a positive and 5 area＇s microbial quotient had a negative relation with heavy metals. Compared to microbial biomass, microbial quotient and qCO2 were more sensitive to heavy metal stresses, so when analyzed the soil respiration and microbial indices in different kind of soils and heavy metals stresses, microbial quotient and qCO2 were the first choose. The accumulation of heavy metals in paddy soil could also improve the contents of soil organic carbon.