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

发布时间：2018-03-09 13:58

本文选题：胶州湾　切入点：沉积物-海水界面　出处：《海洋科学》2017年03期 　论文类型：期刊论文

【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。
[Abstract]:The transport characteristics of dissolved inorganic nitrogen (DINs) at the interface of sediment and seawater in Jiaozhou Bay in summer and winter were studied by means of laboratory culture under in situ temperature and dissolved oxygen conditions. In winter, the DIN of sediment / seawater interface in Jiaozhou Bay is mainly exchanged in the form of NO_3-N and NH_4-N, and in summer, the sediment of Jiaozhou Bay is the source of DIN in water body. The exchange flux is 1.64 脳 10 ~ (10) mg / d, which can provide 39.3% of nitrogen needed to maintain primary productivity, while the winter sediment is a sink of DIN, and its exchange flux is 2.12 脳 10 ~ (-8) mmol 路d ~ (-1). Using correlation analysis and principal component regression analysis, The relationship between the exchange rate of DIN and the environmental factors of the bottom layer was studied. The results showed that the exchange of DIN between sediment and seawater interface in Jiaozhou Bay in summer was mainly due to the mineralization of organic matter in the sediments. The assimilation and diffusion of benthic algae are regulated by the mineralization of endogenous organic matter, the assimilation of benthic algae, and the process of adsorption-desorption and diffusion in winter.
【作者单位】：中国科学院海洋生态与环境重点实验室;中国科学院大学;青岛海洋国家实验室海洋生态与环境功能实验室;
【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)~~
【分类号】：P736.41

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