摘要
主要研究了南沙群岛海域泻湖及礁外沉积物间隙水生态系中的营养 组份 ＮＯ３－Ｎ， ＮＯ２－Ｎ， ＮＨ４－Ｎ， ＰＯ４－Ｐ， ＳｉＯ３－Ｓｉ及其在沉积物一海水界面间扩散转 移通量，结果表明：（１）该海域间隙水中营养组份的浓度较高，∑Ｎ／Ｐ礁外间 隙水高于泻湖间隙水，相对而言，泻湖间隙水中缺氮，礁外间隙水中缺磷，礁外 间隙水中营养组份的垂直分布各异。（２）该海域沉积物活性明显高于东中国 海，沉积物中大量营养组份向上覆海水扩散转移，Ｈ４ＳｉＯ４是礁外界面扩散是最 大的组份，而在泻湖中ＮＯ３－或ＮＨ４＋是最大扩散量的组份，礁外界面Ｈ４ＳｉＯ４， ＮＯ３－扩散大于泻湖，这些扩散转移特征由组份本身的性质与环境特性决定； （３）该海域水温高是造成间隙水中营养组份大量产出并向上覆海水扩散转移 的主要原因，温度高，沉积物释放出营养组份的表现活化能降低，沉积物的活 性增强，从而释放扩散出大量的营养组份。
The nutrients (NO3-N, NO2-N, NH4-N, PO4-P, SiO3-Si) in Sediment interstitial waters and their diffusion fluxes across sediment-water interface were studied in the ecosystem of lagoon and outer-reef in the district of Nansha Islands, South China Sea. The main results show as follows: (1) The nutri- ent concentrations are high in interstitial waters of the district and the ratio of ∑N/P of interstitial waters is higher in outer-reef than in lagoon. The nitrogen of interstitial waters is deficient in lagoon and P in outer-reef. The vertical distributions of nutrients are different in interstitial waters of outer- reef. (2) The activity of sediment in the district of Nansha Islands is higher than that of in the East China Sea. A great deal of nutrient diffuses from sediment to overlying water. H4SiO4 is the most diffusion flux component off nutrients in outer-reef and NO-3 or NH+4 is the most diffusion flux component of nitrients in lagoons. The diffusion fluxes of H4SiO4, NO3 are higher in outer-reef than that of in lagoon. The diffusion characteristics of nutrients are dicided by nutrient feature and sediment environ- ment. (3) The high temprature in the district of Nansha Islands is the main season that causes a great deal of nutrient produced in sediment and diffused from sediment to overlying water. The apparent ac- tive energy is decrese in condition of high temprature and the sediment activity is increase, so a great deal of nutrient is produced in sediment and diffused from sediment to overlying water.
出处
《海洋科学》
CAS
CSCD
北大核心
1996年第5期43-50,共8页
Marine Sciences
基金
国家自然科学基金资助项目!(49576291).
关键词
沉积物
海水界面
南沙海域
营养物质
扩散通量
Nutrient, Sediment-seawater interface, Interstitial water, Diffusion flux, The district of Nansha Islands
