中文摘要：

以三江平原典型碟形沼泽湿地为研究对象,分析了湿地土壤氮素的分布特征和影响因素,及其与湿地演替的关系。结果表明：土壤TN和NH4＋-N含量在碟形湿地内的分布规律是一致的,均表现为随着湿地水位的降低而逐渐降低,随着土壤深度的增加而降低。受水位波动的影响沼泽化小叶章湿地土壤NO3--N含量降低明显,而永久淹水湿地表层土壤该形态氮含量较下层高。碟形湿地土壤各形态氮素的分布受到土壤有机质含量、水分特征、生物量分布特征等多种因素的影响。

英文摘要：

The soil nitrogen distribution characteristics in the typical depressional wetland and their impact factors were analyzed.The results showed that the distribution regularity of TN and NH4＋-N contents in the depressional wetland soil were the same,which decreased with the rise of water level and simultaneously decreased with the increase of soil depth.The NO3——N content in 0-20 cm soil of Deyeuxia angustifolia marsh wetland decreased obviously for the soil leaching of water level fluctuation.And NO3——N contents in the surface soil of permanently flooded wetland were higher than those of in the lower soil layer.The contents and distributions of TN,NH4＋-N and NO3——N in the depressional wetland soil influenced by multiple factors,such as soil organic matters,water condition and biomass distribution characteristics.