钦州湾夏季营养盐的分布特征及富营养化评价  

Distribution characteristics of nutrients and eutrophication assessment in summer in Qinzhou Bay

作　　者：杨斌[1,2,3] 方怀义[1,2] 钟秋平[1,2] 张晨晓[1,2] 李尚平[1,2] 

机构地区：[1]钦州学院北部湾海洋保护与开发利用广西高校重点建设实验室,广西钦州535000 [2]钦州学院海洋学院,广西钦州535000 [3]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《海洋通报》2012年第6期640-645,共6页Marine Science Bulletin

基　　金：广西自然科学基金项目(0832018Z);广西科学研究与技术开发计划项目(0895004-4);广西科学研究与技术开发计划项目(0992027-1);广西教育厅科研项目(200807LX330);广西教育厅科研项目(201106LX546);钦州学院校级科研项目(2011XJKY-11B)

摘　　要：2009年8月对钦州湾海域的现场调查资料,分析了钦州湾表层海水中营养盐的分布特征及其成因。结果表明:该湾亚硝酸盐(NO2-N),硝酸盐(NO3-N),铵盐(NH3-N),无机磷(PO4-P)和活性硅(SiO3-S)i平均含量分别为0.05 mg/L,0.46 mg/L,0.09 mg/L,0.007 mg/L和1.54 mg/L。在空间分布上,各营养盐含量均呈现出由湾内向湾外逐渐递减的变化趋势,体现出夏季陆地径流的主导控制作用。相关性分析表明,陆源水的物理混合过程是影响诸营养盐含量的主要因素,生物、化学作用次之。通过污染指数A及营养状态质量指数NQI的分析,整个海湾水质处于中度污染程度和富营养化状态,以无机氮为主要污染因子。Based on the data from the field survey in Qinzhou Bay, Guangxi, at the south of China, in August of 2009, the distribution characteristics of nutrients and their causes were analyzed. The results showed that the average levels of NO2-N, NO3-N, NH3-N, PO4-P and SiO3-Si in the surface seawater were 0.05, 0.46, 0.09, 0.007 and 1.54 mg/L, respectively. A trend of the nutrients declining from the upper bay to the outside bay was found, suggesting that the land runoff was the major controlling factor in summer. The correlation analysis showed that the physical mixing of seawater was the first major factor influencing nutrient distribution in the bay, and the biological and chemical factors were the second influencing factors. The seawater quality of the bay was analyzed by using pollution index A and eutrophication index NQI. The results suggested that there was moderate pollution and eutrophication state in the whole survey area, and inorganic nitrogen was the main pollution factor.

关 键 词：营养盐 分布特征 营养状态 钦州湾 

分 类 号：P734.2[天文地球—海洋化学]