摘要
对珠江口 4个柱状沉积物中的氮进行测定 ,研究了氮的存在形态、含量及垂向分布特征 ,探讨了沉积物中有机质的来源和输入途径 .结果表明 :TN含量的变化范围为 85 0. 6 2～ 2 340 . 85mg/kg ,平均值15 0 2. 73mg/kg .垂直分布表现为底层向表层逐渐增加的总趋势 ,且两端含量变化较缓、中间较大。有机氮含量的变化范围为 6 5 5. 4 2～ 2 0 2.9 86mg/kg ,平均值1187. 86mg/kg .垂直分布表现为 2种分布类型 :随深度减小型和两端含量高、中间低型 .无机氮中铵氮含量较高 ,变化范围4 7. 5 9～ 739. 6 1mg/kg ,平均值为 2 71 6 9mg/kg .铵氮在沉积物中的含量随深度而增加 .TOC/TN比值在 5至 17之间 ,明显反映出有机质是陆源和水生 2种来源的混合输入。总氮和有机氮的沉积过程有明显的同步效应 ,而和铵氮之间的同步相关性较小 ,并且因站位不同差异很大。
Based on the measurement of the concentration of nitrogen in four core sediments from Pear River Estuary,the forms and the depth-dependent changes characteristics of nitrogen were studied,and the possible sources of nitrogen in the sediments were discussed. The results indicate that the content of total nitrogen ranged from 850.62mg/kg to 2 340.85mg/kg,with mean content of 1 502.73mg/kg. There is a general tendency for an upward increase in core sediments,which is more evident in the middle than in two ends. Organic nitrogen had a range of content from 655.42mg/kg to 2 029.86mg/kg,with mean content of 1 187.86mg/kg. And the content of organic nitrogen decreases gradually with the increase of depth or lower in the middle than in two ends. The content of NH_4-N was relatively high,ranging from 47.59mg/kg to 739.61mg/kg,with mean content of 271.69mg/kg,and increases obviously with the increase of depth.The TOC/TN ratios were most between 5 and 17,which show organic matter is the mixture of aquatic and terrestrial sources. The total nitrogen has distinct synchronization phenomenon with the organic nitrogen in sedimentation course,but has little relativity with the NH_4-N. There is large difference of synchronization phenomenon between total nitrogen and NH_4-N at different sites.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2005年第2期195-199,共5页
Environmental Science
基金
中国科学院知识创新工程项目 (KSCX2 SW 10 2 )
广东省重大科技项目 (A2 0 0 0 99F0 1
A3 0 5 0 3 0 1)
国家重点基础研究发展规划 (973 )项目 (2 0 0 1CB40 970 7)
关键词
氮
有机质
沉积物
珠江口
nitrogen
organic matter
sediment
Pearl River Estuary
