| 摘要: |
| 2003年1月采集了哑铃湾网箱养殖区和非养殖区的沉积物柱状样,对氮的垂直剖面和沉积物-海水界面的通量进行了比较研究。结果表明,养殖区和非养殖区氮的垂直剖面和通量存在很大差异。交换态NH4+-N和交换态氮养殖区随深度的增加而降低,非养殖区随深度的增加而增加;非交换态氮养殖区与非养殖区差异不大;其它各形态氮一般随深度的增加呈降低的趋势。除非交换氮以外,各形态氮的含量表层和近表层养殖区明显高于非养殖区,养殖年限越长含量越高。氮的通量,主要是氨氮的通量,养殖区为80.54mg/(m2·d),非养殖区仅为5.58mg/(m2·d),养殖较长时间现已停养的海区也达到了86.18mg/(m2·d)。 |
| 关键词: 哑铃湾 网箱养殖 沉积物 氮 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(40071074) |
|
| Nitrogen in the sediments at cage farming sea areas of Yaling Bay |
|
|
| Abstract: |
| Nitrogen profiles in the sediments and fluxes are reaserched comparatively between cage farming regions and natural regions of Yaling Bay. Results indicate that the contents of transferable NH4+-N and transferable nitrogen decrease with the depth increase in cage farming regions, but that is in reverse in natural regions. The contents of the other forms of nitrogen generally decrease with the depth increase. Except for NNEX, the nitrogen contents of other forms in surface sediments are as follows: the contents in cage farming regions>those in natural regions, which will be higher when the time of cage farming is prolonged. Nitrogen fluxes, mostly for NH4+-N, are 80.54 mg/(m2·d) in cage farming regions, 5.58 mg/(m2·d) in natural regions, and 86.18 mg/(m2·d) in previous cage farming regions which have not been farmed now. |
| Key words: Yaling Bay cage farming sediment nitrogen |
