| 摘要: |
| 2000年10月和2001年5月随“东方红2号”考察船在 东、黄海进行考察,在A2、E2、E4、E5、E65个站位作了培养实验,研究沉积物-水界面在氧化和还原条件下的交换通量。在东海海域,NO3-、 PO43-、总磷(TDP)由水向沉积物中扩散,NH4+、SiO32-由沉积物向水中扩散,NO3-、TDP、NH4+在还原条件下的交换通量大于氧化 条件下的交换通量,PO43-、SiO32-在氧化还原条件下的交换通量基本一致。在黄海海域,两站位各溶解态营养盐的迁移方向有较大差异。在距离陆地较近的海域,各溶解态营养盐多由水中向沉积物中扩散,且距离陆地越近,交换通量越大。在东、黄海海域,沉积物释放的SiO32-对初级生产力的贡献分别为 13%、10%～18%,与河流输送和大气沉降相比,沉积物对黄海、东海SiO32-的贡献分别占90%、86%,说明沉积物是SiO32-的源。而在整个东、黄海海域,对于溶解无机氮(DIN)和PO43-来说,它们的交换通量为负值,即沉积物从水体中吸附溶解无机氮和磷,说明沉积物是DIN和 PO43-的汇。 |
| 关键词: 沉积物-水界面 营养盐 黄海 东海 |
| DOI： |
| 分类号: |
| 基金项目:国家重点基础研究发展规划资助项目(G1999043705,200109703) |
|
| Sediment-water fluxes of nutrients in the Yellow Sea and the East China Sea |
|
|
| Abstract: |
| Sediment-water fluxes of dissolved nutrient were investigated at 5 stations(A2, E2, E4, E5, E6) in the Yellow Sea and the East China Sea in October 2000 and May 2001. The benthic fluxes of nutrient species were determined by incubating the sediment core samples with bottom seawater bubbled with air or nitrogen. In the Yellow Sea, at station A2, the fluxes of dissolved nutrient expect NO3-, SiO32- all removed from sediment to overlying water. At station E2, the fluxes of dissolved nutrient expect NH4+, DIN all removed from sediment to overlying water. In the East China Sea, the fluxes of NO3-, PO43-, and total dissolved phosphorus(TDP) were removed from overlying water to sediment, the fluxes of NH4+ and SiO32- were removed from sediment to overlying water. The fluxes of NO3- and TDP, NH4+ under anoxic condition are higher than those under oxic condition, the fluxes of PO43- and SiO32- are consistent under anoxic and oxic conditions. In the Yellow Sea and the East China Sea, the sediment accounts for 13%, 10%～18% of the primary production. Compared with the riverine inputs and atmosphere adoption, in the Yellow Sea and the East China Sea, 90%, 86% SiO32- came from sediment, which is the source of SiO32-. The DIN and PO43- were uptaken by sediment. |
| Key words: sediment-water interface nutrient Yellow Sea East China Sea |
