中文摘要：

水田和旱地是农田土壤的主要利用方式，对有机碳的稳定机制和矿化规律具有重要影响。本研究通过室内培养试验观测了水田、旱地土壤有机碳的矿化动态，并比较了两者之间有机碳矿化量的差异。结果表明，水田、旱地土壤有机碳矿化规律均表现为培养前期快速下降，培养后期保持相对稳定的趋势，符合对数关系。但整个培养期内，水田土壤有机碳矿化速率比旱地土壤平均高24．09％，大小幅度变化在4．48％～48．40％之间，累计矿化量高4．20％。48．40％，且有机碳矿化量差异主要集中在培养前期，随着培养时间的延长而不断缩小。统计结果表明，供试水田、旱地土壤有机碳矿化速率主要受有机碳（SOC）、微生物生物量碳（MBC）及水溶性有机碳（DOC）含量影响，相关系数分别为0．948、0．745、0．763。

英文摘要：

Paddy field and upland soils are the main use patterns of farmland which are specially important to the mechanism of organic carbon stability and the rules of soil organic carbon mineralization. By lab incubation experiment, the dynamic mineralization of SOC in paddy field and upland soils were observed, and the difference of SOC mineralization between paddy field and upland soils were also compared. The results showed that the SOC mineralization in both paddy field and upland soils decreased quickly in the beginning of the incubation, and keep relatively constant at the later incubation time and fitted to logarithmic equation. In the whole incubation time, the SOC mineralization rate in paddy field was from 0.48% to 48.40% higher than that in upland soils, and the average was 24.09%. The cumulative mineralization in paddy field was from 4.20% to 48.40% higher than that of upland soils. But the difference in soil organic carbon mineralization was mainly in the beginning of the incubation period, and the gaps narrowed along with the incubation time. Soil organic carbon mineralization was mainly influenced by the content of soil organic carbon, microbial biomass carbon and dissolved organic carbon, and the correlation coefficients were 0.948, 0.745, 0.763 respectively.