胶州湾沉积物-海水界面溶解无机氮的迁移特征及其影响因素解析  

Benthic exchange of dissolved inorganic nitrogen and impact of relevant environmental factors at sediment-water interface in Jiaozhou Bay

作　　者：汪雅露 袁华茂[1,2,3] 宋金明[1,2,3] 李学刚[1,2,3] 李宁[1,2,3] 曲宝晓[1,3] 康绪明[1,3] 王启栋[1,2,3] 邢建伟[1,2,3] 梁宪萌 

机构地区：[1]中国科学院海洋生态与环境重点实验室,山东青岛266071 [2]中国科学院大学,北京100039 [3]青岛海洋国家实验室海洋生态与环境功能实验室,山东青岛266071

出　　处：《海洋科学》2017年第3期102-112,共11页Marine Sciences

基　　金：国家重点基础研究发展计划项目课题(2015CB452902、2015CB452901);国家基金委-山东省联合基金项目(U1606404);青岛国家海洋实验室"鳌山人才"卓越科学家专项项目资助(2015ASTP-OS13)

摘　　要：采用实验室培养法,在原位温度和溶氧条件下,研究了夏、冬季胶州湾沉积物-海水界面溶解无机氮(DIN)的迁移特征。结果表明,夏、冬季胶州湾沉积物-海水界面DIN主要以NO_3-N和NH_4-N的形态进行交换,夏季胶州湾沉积物表现为水体DIN的源,其交换通量为1.64×10~9 mmol/d,可以提供维持初级生产力所需氮的39.3%;而冬季沉积物表现为DIN的汇,其交换通量为–2.12×10~8 mmol/d。利用相关分析和主成分回归分析,研究界面不同形态DIN交换速率和底层环境因子的关系,结果表明,夏季胶州湾沉积物-海水界面DIN的交换主要受沉积物中有机质的矿化、底栖藻类的同化作用和扩散过程共同调控,而冬季则主要受内源有机质的矿化、底栖藻类的同化作用、吸附-解吸和扩散过程共同调控。Benthic exchange rates of dissolved inorganic nitrogen （DIN） at the sediment-water interface in Jiaozhou Bay are measured using intact sediment core incubation. Sediment is found to be an important source of DIN in summer, with a flux of 1.64 × 109 mmol/d, providing 39.3% of the nitrogen required in primary productivity. However, DIN transfers from the water column to sediment at a flux rate of –2.12×108 mmol/d in winter. Results of correlation analysis and principle component regression analysis are used to discuss impacts of environmental factors on the exchange in detail, and it is determined that mineralization, assimilation, and diffusion are the key processes controlling the exchange of DIN at the sediment-water interface in Jiaozhou Bay during summer. However, exchange of DIN is probably significantly influenced by degradation of marine endogenous organic matter, assimilation, adsorption-desorption, and diffusion during winter.

关 键 词：胶州湾 沉积物-海水界面 溶解无机氮 交换速率 环境因素 

分 类 号：X142[环境科学与工程—环境科学]