淡水沼泽湿地泥炭沉积中氮素分布特征

Characteristics of Nitrogen Distribution in Peat Deposit of Freshwater Marsh Wetland

采用冬季采样 ,现场分层的方法 ,系统地研究了我国面积最大的淡水沼泽湿地———三江平原沼泽湿地中河床 河漫滩型泥炭地和谷底洼地型泥炭沉积中TN、NH+4 N和NO- 3 N的分布特征 .结果表明 ,在不同沉积层中 ,NH+4 N、NO- 3 N明显富集于Ase层 ,TN在Hi1层含量最高 .TN含量随着泥炭粒级的减小而明显增加 ,NH+4 N主要分布在粒级 0 1 49～ 0 0 74mm的泥炭机械组分中 ,NO- 3 N主要分布在粒级 0 0 3～ 0 1 49mm的泥炭机械组分中 .

Using the methods of sampling in winter and the dividing soil layers in soil profiles, the characteristics of TN, NH + 4 N and NO - 3 N concentration distribution in peat sediments of river bed flood land and valley depression land in Sanjiang Plain where is the most extensive freshwater marsh wetland in China were systematically studied. The results showed that NH + 4 N and NO - 3 N was obviously accumulated in A se layer, and TN content in H i1 layer was the highest with the comparing to other layers. TN content in peat sediments was obviously increased with the peat particular size decreasing, NH + 4 N was mainly distributed in peat component with 0 149～0 074mm size, and the most of NO - 3 N was in peat component with 0 03～0 149mm granule size.