作　　者： ; ;

机构地区： 汕头大学

出　　处： 《台湾海峡》 2006年第2期194-201,共8页

摘　　要： 本文分析了2000～2003年汕头近岸海域氨氮、亚硝酸氮和硝酸氮的时空变化趋势及其与pH、溶解氧和盐度的相关关系.结果表明,调查期间无机氮（DIN）含量实测值的变化范围为0.03～2.04mg/dm^3,总均值为0.75±0.38mg/dm^3.DIN含量在空间分布上由港内向港外递减的趋势十分明显.在时间变化上则呈枯水期高而丰水期低的特点.与国内其他类似海区相比,汕头近岸海域的DIN含量为中等偏高,属轻度污染水平;来源于韩江和榕江的陆源输入为最主要的污染源.调查期间的DIN含量年均值有逐年下降的倾向,可能与华南地区气候异常和汕头城市污水处理能力日渐提高有关.相关性分析结果表明,汕头近岸海域DIN含量与溶解氧含量、pH、盐度这些变量之间存在着显著的负相关关系.这体现了水体富营养化对近海环境质量具有潜在的负面影响. An investigation on spaeial-temporal distribution of ammonium, nitrite and nitrate and its relation to pH, dissolved oxygen and salinity was performed in offshore water of Shantou from 2000 to 2003. The concentration of inorganic nitrogen （DIN） in each sample varied from 0. 030 to 2.040mg/dm^3, with an average of 0. 750 ± 0.380mg/dm^3. During the investigation, the concentration of DIN declined significantly from the inner part to the outer part of Shantou Harbor. DIN was high in dry season （March） and low in rainy season （July）. Nitrate was the domain source of DIN with an average of 73.6%, and the second was ammonium with an average of 22.1%. Compared with estuaries of similar environmental characteristics in China, the concentration of DIN in offshore water of Shantou was a little higher and at mid-level of slight contamination in the whole country. Sewage discharges from Han River and Rong River are the most important sources of DIN to Shantou Harbor. During the investigation, the concentration of DIN showed an annual decreasing tendency, which might be attributed to the abnormal weather in southern China and increasing of treatment capacity of urban sewage in Shantou. The significant negative relationships were found between the concentration of DIN and pH, dissolved oxygen, and salinity, indicating that potential negative effect of water eutrophication in offshore environment.

关 键 词： 海洋化学 无机氮含量 分布 近岸海域 汕头

领　　域： [天文地球] [天文地球]