里下河地区代表性浅水湖泊表层沉积物可转化态氮的赋存特征

摘要

以受人类活动影响剧烈的小型富营养化湖泊为研究对象，研究湖泊表层沉积物可转化态氮的赋存特征，探索环境因子与各形态可转化态氮之间的关系。结果表明：①4个湖泊表层沉积物中各形态可转化态氮质量比次序为强氧化剂可提取态氮（ SOEF-N）＞离子交换态氮（ IEF-N）＞弱酸提取态氮（WAEF-N）＞强碱可浸取态氮（SAEF-N）；②w（IEF-N）与黏粒、壤粒、砂粒、w（Ca）呈显著的相关性；w（WAEF-N）与含水率、w（有机质）、w（TP）、w（Ca）、w（Zn）呈显著相关性；w（SOEF-N）与黏粒、w（有机质）、w（ TOC）、w（ NH＋4）、w（ Mn）呈显著的相关性；w（ SAEF-N）仅与w（ TP）和w（ Ca）存在一定的相关性。③受人类活动影响较大的湖泊w（ IEF-N）和所占TN百分比最高；表层沉积物中的w（ WAEF-N）与w（有机质）多寡一致。%Taking the small eutrophic lake, which is seriously affected by human activities, as the research object, the occurrence characteristic of transferable nitrogen forms in the sediments on the surface of the lake is studied and the relationship between environmental factors and various forms of transferable nitrogen is explored.The results indicate that:(1) the distribution order of various nitrogen in the four sediments samples from the lake surface was SOEF-N>IEF-N>WAEF-N>SAEF-N;(2) There is obvious relevance between w( IEF-N) and clay, soil, sand and w(Ca); There is obvious relevance between w(WAEF-N) and moisture content, organic matter, w(TP), w( Ca) and w ( Zn ); There is obvious relevance between w ( SOEF-N ) and clay, organic matter, w ( TOC ) , w( NH+4 ) and w ( Mn ); There is only certain relevance between w ( SAEF-N ) and w ( TP ) and w ( Ca ) . (3) w( IEF-N) hold the dominance percentage in TN in big lakes significantly affected by human activity; while the content of WAEF-N is consistent with the amount of organic matter content in the surface sediments.