我国东北寒温带湿地土壤碳氮分布及相关性

以东北寒温带不同纬度典型湿地土壤碳氮分布关系为研究对象,遴选漠河湿地、洪河湿地及七星河湿地进行土壤样品的调查采集并进行土壤碳氮分布相关分析,通过构建不同纬度沼泽湿地土壤碳氮含量垂直分布结构,考察不同湿地不同植被类型土壤碳氮分布规律及土壤对植被生长状况的影响。结果表明:土壤氨氮及硝态氮在土壤垂直分布中有明显的表聚现象,含量随土壤深度的增加呈明显下降趋势;七星河湿地及洪河湿地土壤碳氮含量呈显著的线性相关关系,而漠河湿地土壤碳氮含量相关性不显著。本研究通过对东北寒温带不同纬度沼泽湿地土壤碳氮含量分布的研究,旨在对全球沼泽湿地氮循环的研究提供一定的参考作用。

Distribution of Soil Carbon and Nitrogen and their Correlation in Boreal Wetland in the Cold Temperate Zone of Northeast China

This study examined the distribution of carbon and nitrogen in typical wetland soils at different latitudes in the cold temperate zone of northeast China.Soil samples were collected from Mohe wetland,Honghe wetland and Qixinghe wetland.The distribution of soil carbon and nitrogen in different wetland vegetation types and the effects of soil on vegetation growth were investigated by constructing vertical distribution structure of soil carbon and nitrogen in marsh wetlands at different latitudes.The results showed that:the vertical distribution of soil ammonia nitrogen and nitrate nitrogen showed the apparent surface assembly phenomenon.The content of soil ammonia nitrogen and nitrate nitrogen significantly decreased with soil depth.The contents of soil carbon and nitrogen showed significant linear correlation in Qixinghe Wetland and Honghe Wetland,but had no significant correlation in Mohe Wetland.The research on the contents of soil carbon and nitrogen in swamp marsh at different latitudes in the cold temperate zone of northeast China would provide references for global nitrogen cycle in marsh wetlands.