引用本文:	张乃星,宋金明,贺志鹏,李学刚,袁华茂,李宁.模拟添加氮对海水溶解无机碳体系的影响[J].海洋科学,2006,30(12):47-51.

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模拟添加氮对海水溶解无机碳体系的影响
张乃星^1,2, 宋金明¹, 贺志鹏^1,2, 李学刚¹, 袁华茂¹, 李宁^1,2
1.中国科学院海洋研究所;2.中国科学院研究生院

摘要:

碳和氮作为主要的生源要素对维持海洋生态系的正常运转起着至关重要的作用,碳与氮的变化是相互耦合的且呈双向作用,为探讨海水无机碳与氮的相互作用规律,研究了室内模拟添加硝酸盐对海水无机碳体系pH、溶解无机碳(DIC)、HCO₃^-、二氧化碳分压(Pco₂)的影响。结果表明,在室内培养的条件下,单纯添加硝酸盐(增加至原海水硝酸盐浓度的5-20倍)可引起培养体系浮游生物量的变化,但不能引起海水pH及DIC、HCO₃^-含量的明显变化,对DIC而言,其变化率仅仅在1%以内,但可导致海水Pco₂的相对明显升高,其最终结果导致海水碳汇强度的减弱,碳源强度的增加。

关键词: 硝酸盐海水无机碳室内模拟

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基金项目:青岛市科技将才专项计划项目(04-3-JJ-03,05-2-JC-90);中国科学院“百人计划”资助项目;中国科学院创新重大项目(KZCX1-SW-01-08KZCX1-01-17)

Influence of external source nitrate on dissolved inorganic carbon system in seawater simulation experiments

Abstract:

As one of the main biogenic elements, nitrogen plays an important role in marine carbon cycling. In this article,the influence of external source nitrate on the inorganic carbon system in seawater simulation experiment was discussed. The external source NO₃^-N can cause the variation of plankton quantity. However, the variation of the content for the inorganic carbon system such as pH, DIC, HC₃^- is little. The relative variation of DIC was lower than 1%, but the increase of the Pco₂ in seawater is up to 10%. The final result is that the external source nitrate may induce the intensity of carbon sink weakened while the intensity of carbon source being enhanced.

Key words: external source nitrate inorganic carbon simulation experiment