中文摘要：

在鄱阳湖南矶山湿地自然保护区的碟形湖区，沿高程梯度采集岗地、高滩、低滩和泥沼土壤，对碳、氮、磷及其化学计量特征进行了研究。结果表明，表层土壤（O～10cm）有机碳含量在岗地土壤最低；总氮和总磷含量均表现为岗地〉高滩〉低滩〉泥沼，且总氮和总磷含量呈显著正相关。土壤有机碳和总氮含量均表现出随土层加深而减少的趋势。表层土壤C／N、C／P和N／P的平均值分别为11．17、52．74和5．03，且随着高程梯度和湖泊的变化，C／N保持相对稳定，而C／P和N／P的变化较大。铵态氮含量表现出岗地〈高滩〈低滩〈泥沼，硝态氮含量表现出高滩〈低滩〈岗地〈泥沼。有效磷与总磷含量呈极显著正相关。总之，受到鄱阳湖季节周期性水文变化的影响，研究区湿地土壤养分有较大差异，其中氮是N／P比的主要控制因子。

英文摘要：

Four types of wetland habitats, i.e. downland, high beach, low beach and swamp, were chosen as elevation gradients in 4 shallow - lakes in Nanjishan wetland nature reserve of Poyang Lake and the contents of soil C, N and P contents and their stoichiometry along the 4 elevation gradients were determined. The results showed that SOC content in 0-10 cm soil layer was lowest in the downland, TN and TP contents were ranked as downland 〉high beach 〉 low beach 〉 swamp, TN was positively correlated with TP content, SOC and TN contents were decreased with the depth of soil layer, mean ratios of C/N, C/P and N/P were 11.17, 52.74 and 5.03, respectively. In the study area, soil C/N was relatively stable, while C/P and N/P varied substantially either along elevation gradients or among shallow-lakes. NH4-N content was ranked as downland 〈 high beach 〈 low beach 〈 swamp, while NO3-N content was ranked as high beach 〈 low beach 〈 downland 〈 swamp. Furthermore, AP and TP contents were positively correlated. In short, soil nutrients in the study area exhibits large variations due to the seasonal dynamics of hydrology in Poyang Lake and TN was the primary limiting factor of N/P ratio.