摘要
氮是引起湖泊水体富营养化的关键营养元素之一.本次工作从贵州两个重要水库(红枫湖和百花湖)采集了未受扰动的沉积物样品柱,分析了分层沉积物样品中的总氮、无机交换性氮和固定铵的含量及垂直剖面分布.研究表明,红枫湖和百花湖沉积物中具有较高的全氮含量,平均含量约为沉积物干重的0.36％～0.40％,其垂直分布在埋藏过程中受到成岩作用改造;沉积物交换性氮在沉积物中的赋存受到全氮含量和埋藏环境的双重控制;红枫湖和百花湖沉积物具有较强的吸持固定铵的能力,沉积物固定铵的绝对含量的平均值分别为434.05 mg/kg和416.94mg/kg;分别占全氮的13.53％和12.53％.
Nitrogen plays a key role in lake eutrophication. We collected several undisturbed sediment cores from two lakes, Lake Hongfeng and Lake Baihua in Guizhou Province to analyze the concentration and profile distributions of total, exchangeable inorganic and fixed nitrogen. The results show that; (1) the nitrogen load in the sediments of the two lakes is higher in comparison with the average of lakes and reservoirs in China. Their average concentration of total nitrogen ranges from 0. 36% to 0. 40% (dry sediment weight). It is obviously due to influence of diagenesis on vertical profile 'of total nitrogen in the sediment. The sediment of the reservoirs may be one of main nitrogen sources to cause the eutrophication. (2) The concentrations of total nitrogen and the burial environmental conditions are two main factors in distribution of the exchangeable nitrogen on sediment cores. (3) The fixed nitrogen is one of major sinks of nitrogen in the two reservoirs sediments. The concentration of fixed nitrogen in Lake Hongfeng and Lake Baihua, 434. 05 mg/kg and 416. 94mg/kg respectively, is higher than the data reported for others lakes or reservoirs of China.
出处
《湖泊科学》
EI
CAS
CSCD
2002年第4期301-309,共9页
Journal of Lake Sciences
基金
国家自然科学基金项目(40103008)
中国科学院知识创新工程重要方向项目(KZCX2-105)
贵州省自然科学基金项目联合资助
