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作 者 ：郑国侠^1,2;宋金明¹;戴纪翠^1,2

期 刊 ：应用生态学报 2006年 17卷 04期 页码：740-746

关键词：子；

摘 要 ：

分析了化学驱动因子对海洋碳迁移转化过程的影响.海洋碳迁移转化与各种化学驱动因子参与的生物地球化学过程密切相关.营养盐水平、pH、溶解氧浓度（DO）、氧化还原电位（Eh）、SO₄^2-及硫电位（Es）等主要化学驱动因子的消长导致了海洋化学环境的变化，进而对海洋碳的迁移转化产生影响.在营养盐的供给和生物吸收情况良好的海域，CO₂由于光合作用，并通过沉降有机物的氧化,不断被转移到海水深层，使得海水中的CO₂分压（P_CO2）降低，CO₂的海-气交换量和有机碳输出通量增大，从使该海域表现为CO₂的汇.由于CO₂的溶解与吸收以及有机物的降解造成了海洋环境的日益酸化，引起了海水中碳酸盐溶解度增大；沉积物中酸碱环境的变化也与有机物的矿化以及碳酸盐的溶解、沉淀过程密切相关.此外，DO、Eh、SO₄^2-及Es的变化与水体中有机碳的矿化分解过程和碳在沉积层中沉积埋葬过程相耦合.在水体中，高DO、高Eh利于有机碳向无机碳转化；而在DO和Eh较低的沉积环境中，高SO₄^2-不利于有机碳的埋葬与保存.

Abstract:

The study showed that the migration and transformation of marine carbon had a close relation with the biogeochemical processes driven by various chemical factors.The growth and decline of nutrient concentration, pH,dissolved oxygen (DO),redox potential (Eh),SO₄^2-,and sulfur potential (Es) could change marine chemical environment,and thus,affect the migration and transformation of marine carbon.When the nutrient supply was adequate to the nutritional demand of phytoplankton,CO₂ was conveyed to deep sea through photosynthesis and organic matter oxidation,which caused the decrease of sea water P_CO2 and the increase of seaair CO₂ flux and organic carbon output,making the sea area as a CO₂ sink.But,the increasing acidification of marine environment caused by CO₂ dissolution and organic matter degradation brought about the solubility augmentation of carbonate in seawater.Moreover,the mineralization of organic carbon was coupled with the changes of DO,Eh,SO₄^2- and Es,and the deposition and burial process of carbon in sediments.In sea water body,high DO and high Eh accelerated the transformation from inorganic carbon to organic carbon,while in sediment,high SO₄^2- was adverse to the burial of organism with low DO and low Eh.

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