中文摘要：

以黄河三角洲芦苇湿地为研究对象,通过土壤有机碳（SOC）矿化过程室内模拟,研究了土壤有机碳矿化动态特征,探讨了土壤有机碳含量、水分和盐渍化程度对土壤矿化过程的影响,明确了土壤有机碳矿化的主控因子。结果表明：土壤累积矿化量随时间呈指数增长趋势,培养前期（0-10d）土壤累积矿化量约占整个培养周期总累积矿化量的50%左右;培养中期（11-35d）土壤矿化速率明显下降,前35天土壤累积矿化量约占整个培养周期总累积矿化量的85%;培养后期（36-70d）土壤矿化速率趋于平缓。多因素方差分析显示,土壤有机碳含量、水分和盐渍化程度对土壤有机碳的矿化作用均有显著影响（P〈0.05）。其中,SOC的含量是影响矿化最主要的因素（F0.05=3711,P〈0.001）,其与累积矿化量呈显著的正相关关系（R2adj=0.775,P〈0.05）;土壤水分含量对SOC矿化作用的影响次于有机碳含量（F0.05=71.31,P〈0.001）,盐度对土壤累积矿化量的影响最小（F0.05=33.58,P〈0.001）。但是,当土壤处于半淹水和淹水状态时,强度盐渍化、有机碳含量低的O1处理组土壤累积矿化率高于土壤有机碳含量高的各个O3处理组。因此,滨海湿地土壤有机碳含量较低、盐渍化程度较高的退化湿地土壤的CO2释放问题应被关注。

英文摘要：

In this study, the reed wetlands in the Yellow River Delta selected as the study sites. The dy- namic characteristics of soil organic carbon （SOC） mineralization were investigated through the laboratory simulation test, and the influencing factors （e. g. , SOC content, soil moisture and salinity） for the SOC mineralization were also analyzed. The results showed that the cumulative SOC mineralization increased exponentially with the increasing incubation time, and the amount of mineralized SOC in the initial period （0-10 d） of incubation accounted for 500/40 of the total cumulative SOC mineralization. Afterwards, the SOC mineralization rate sharply declined in the middle incubation period （11-35 d）. Till the 35 day, the cumulative SOC mineralization was about 85Y0 of the total amount of SOC mineralization in the whole incubation. And the SOC mineralization rate presented a slow trend in the later period （36-70 d） of incubation. Multi-factor variance analyses indicated that the content of SOC was aprimary factorinfluencing SOC mineralization （F0.05 =3711, P〈 0. 001）, which was confirmed by the significant positive correlation between them （P〈 0.05）. Moreover, the soil moisture and salinity also obviously affected SOC mineralization （P〈 0. 001） and the F0.05value was 71.31 and 33.58, respectively. Above all, a soil C pool loss from SOC mineralization in the coastal wetlands should be paid more attention, especially in the degraded wetland soils with low organic carbon content and highly salt-affected degree.