摘要
根据2006年8月在渤海湾及其邻近海域41个站位取得的155个样品的颗粒有机碳(POC)和颗粒氮(PN)的分析数据,结合同步获得的水文环境要素资料,分析了该区夏季POC和PN的空间分布特征、影响因子与有机碳物源.结果表明,夏季水体中POC的浓度为155.9～1363.1μg/L,平均浓度为429.5μg/L;PN的浓度为26.2～225.5μg/L,平均浓度111.5μg/L.POC与PN的空间分布特征一致,呈现近岸高、远岸低、表层低、底层高的特点.生物作用、水体温盐跃层和总悬浮颗粒物(TSM)是影响研究区POC空间分布的重要原因.POC与TSM的相关分析表明,POC与TSM之间具有正相关关系,不同来源的TSM是控制水体中POC浓度高低的重要因素.本区POC/PN的比值范围为3.4～7.0,但这一物源指标的应用受到海水中颗粒无机氮(PIN)的影响.通过建立POC和PN的一元线性回归模型,估算了样品中PIN的含量.扣除样品中PIN的影响后,本研究区的POC/PON(颗粒有机氮)比值范围介于5.5～19.8之间,显示POC除了海洋生物为主要来源外,周边河流的陆源输入也有重要贡献.这一研究方法对认识中国近海的POC物源具有一定的参考价值.
Based on the analysis of particulate organic carbon （POC） and particulate nitrogen （PN） of the 155 samples collected from the 41 stations in the Bohai Bay and its adjacent sea, during the summer period in 2006, combining with the data of environmental hydrology, the spatial distributions, influential factors and source of POC and PN were discussed. The results show that the concentrations of POC and PN range from 155.9 μg/L to 1 363.1 μg/L, 26.2 μg/L to 225.5 μg/L, with average values of 429.5 μg/L and 111.5 μg/L, respectively. The spatial distribution patterns of POC and PN are similar in the study area. The concentrations of POC and PN in the coastal areas are higher than those in the outer shelf, and the concentrations of POC and PN are higher at the bottom water layers than those at the surface water layers. Biological effect, thermocline and concentration of TSM are the main factors affecting the spatial distribution of POC. There exists a positive correlation between POC and TSM, indicating that the source of TSM is an important factor for the POC. The POC/PN ratio varies from 3.4 to 7.0, but this result is influenced by the presence of particulate inorganic nitrogen （PIN）. According to the univariate linear regression model between POC and PN, the concentrations of PIN in the samples were evaluated. Removing the content of PIN in the samples, the POC/PON ratio ranges from 5.5 to 19.8 （PON = PN - PIN）, suggesting that the terrestrial input originating from the nearby rivers is also an important source of POC, in addition to the major contribution from the marine primary production. This method could be applied to identify the source of POC in other coastal areas of China.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第1期39-46,共8页
Environmental Science
基金
国家重点基础研究发展规划(973)项目(2005CB422304)
国家自然科学基金项目(40776062)
CJ02区块海底底质调查与研究项目(908-01-CJ02)
关键词
颗粒有机碳
颗粒氮
物源
生物作用
渤海
particulate organic carbon
particulate nitrogen
source
biological effect
Bohai Sea
