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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。
The laboratory culture method was used to study the migration characteristics of dissolved inorganic nitrogen (DIN) at the sediment-seawater interface of Jiaozhou Bay in summer and winter under in-situ temperature and dissolved oxygen conditions. The results showed that the sediment-sea interface DIN of Jiaozhou Bay was mainly exchanged with NO_3-N and NH_4-N in the summer and winter. The summer Jiaozhou Bay sediments showed the source of DIN, and the exchange flux was 1.64 × 10 ~ 9 mmol / d, which provides 39.3% of the nitrogen needed to maintain primary productivity, while winter sediments show sinks of DIN with exchange rates of -2.12 × 10 -8 mmol / d. The correlation analysis and principal component regression analysis were used to study the relationship between the DIN exchange rate and the underlying environmental factors. The results showed that the exchange of DIN in the sediment-sea interface of the Jiaozhou Bay in summer was mainly due to the mineralization of organic matter in sediments, The assimilation and diffusion process are controlled together, while the winter is mainly controlled by the mineralization of endogenous organic matter, the assimilation of benthic algae and the adsorption-desorption and diffusion processes.