乳山湾及邻近海域化学需氧量的分布特征及影响因素

Profile Characteristics of COD and Its Influencing Factors in Rushan Bay and Adjacent Area

根据2011年春季（5月）和秋季（10月）乳山湾及邻近海域调查资料,对海水中的化学需氧量的时空分布特征进行研究,并分析了化学需氧量与环境因子之间的关系以及对区域富营养化的贡献率。结果表明,乳山湾及邻近海域海水中的化学需氧量质量浓度春、秋季均表现为湾内高于湾外、近岸高于远岸的趋势,且春季化学需氧量平均质量浓度高于秋季。乳山湾及邻近海域海水中的化学需氧量在春、秋季与温度、盐度均呈显著负相关关系（P〈0.01）,与无机氮呈显著正相关关系（P〈0.05）。化学需氧量对富营养化的贡献值为39.53%～67.18%,化学需氧量是影响乳山湾及邻近海域富营养化的重要因素,但并非决定性因子。

The profile characteristics of chemical oxygen demand（ COD） were studied based on the investigation data in Rushan Bay and adjacent area in spring（ May） and autumn（ October） of 2011. The influencing factors and contribution of COD to eutrophication were also analyzed. The results showed that the distribution of COD was characterized by a decreasing tendency from the upper bay to the outside bay in spring and autumn. The concentration of COD was higher in spring than that in autumn. The content of COD in spring and autumn showed a negative correlation with temperature and salinity（ P〈 0. 01）,while a positive correlation with level of dissolved inorgainic nitrogen（ DIN）（ P〈0.05）. The range of COD contribution to the eutrophication was from 39. 53% to67. 18%,COD as an important factor contributing to eutrophication,not the decisive factor.