春、夏季杭州湾北部近岸水域水化学及营养状况评价

发布时间：2018-04-12 10:03

  本文选题：杭州湾北部近岸水域 + 水化学因子　； 参考：《大连海洋大学学报》2017年06期

【摘要】：为了解杭州湾北部近岸水域水化学状况及其污染程度,利用2011—2015年间对杭州湾北部近岸水域春、夏季9个水化学因子的调查结果,分析了该水域水化因子的变化特征、相关性及氮磷营养盐结构特征,并采用潜在性富营养化法和有机污染指数法,进行了该水域潜在性富营养化程度及污染状况的评价。结果表明:调查期间,杭州湾北部近岸水域,2011—2015年春、夏季pH平均值分别为8.05±0.11和7.96±0.27;春、夏季DO平均值分别为(8.13±0.33)、(7.42±0.31)mg/L,DO饱和度均在88%以上;受潮汐、径流和降水影响,盐度波动范围较大,春、夏季盐度平均值分别为11.67±5.60和12.06±3.28;春、夏季CODMn平均值均小于3 mg/L,符合《海水水质标准》二类水质标准;总氨氮(TAN)、NO-2-N含量均维持在较低状态,符合《渔业水质标准》及经济鱼虾类生长安全浓度的要求;三态氮含量依次为NO-3-NTANNO-2-N,NO-3-N占DIN的69%~97%;pH与氮磷营养盐均为负相关,氮、磷间均呈正相关;潜在性富营养化法计算结果表明,2011—2014年春季,调查水域营养级均为ⅥP,2014年夏季—2015年,N/P值明显下降,营养级过渡到ⅤP,调查水域受磷限制富营养化程度有所降低;采用海水水质一类标准评价,5年所有站位有机污染指数A值均大于4,达到严重污染程度。研究表明,杭州湾北部近岸水域有机污染严重,亟待有效控制与科学管理。
[Abstract]:In order to understand the hydrochemical status and pollution degree of the coastal waters in the northern part of Hangzhou Bay, nine hydrochemical factors were investigated in spring and summer in the northern part of Hangzhou Bay from 2011 to 2015, and the variation characteristics of the hydrochemical factors were analyzed.The correlation and the structural characteristics of nitrogen and phosphorus nutrients were analyzed. The potential eutrophication degree and pollution status were evaluated by using the latent eutrophication method and organic pollution index method.The average value of salinity in spring and summer was 11.67 卤5.60 and 12.06 卤3.28 respectively, the average value of CODMn in spring and summer was less than 3 mg / L, which was in accordance with the second class of water quality standard, and the content of total ammonia nitrogen (TANN) NO-2-N was kept in a lower state.The results of latent eutrophication method showed that in the spring of 2011-2014, the nutritional grade of the investigated waters was 鈪，

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