Riverine contribution of biogenic silica to the oceanic silica budget
Riverine contribution of biogenic silica to the oceanic silica budget
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DOI：
10.4319/lo.1997.42.4.0774
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发表时间：
1997-06-01
影响因子：
4.5
通讯作者：
Conley, DJ
中科院分区：
文献类型：
--
作者：
Conley, DJ
硅藻生长过程中溶解硅酸盐(DSi)的生物吸收和生物成因二氧化硅(BSI)的形成改变了从大陆带到世界海洋的硅的形态。在各种大小的河流中都发现了相当高的BSI浓度，平均为28.0mmol.L-1。河流携带的BSI的全球贡献率估计为1.05+/-0.20TmolSi年(-1)。再加上全球平均河流DSi浓度为150微克分子升(-1)，16%的河流总硅负荷以BSI的形式输送到世界海洋。这种生物多样性的大部分将通过海洋环境中的溶解而重新动员。这些结果表明，河流悬浮携带的生物二氧化硅的贡献是世界海洋硅收支中的一个重要组成部分，这一点以前没有得到承认。
Biological uptake of dissolved silicate (DSi) and formation of biogenic silica (BSi) during diatom growth modifies the form of Si carried from the continents to the world ocean. Significant concentrations of BSI, averaging 28.0 mu mol L-1, are found in all sizes of rivers. The global contribution of BSi carried by rivers was estimated as 1.05 +/- 0.20 Tmol Si year(-1). Combined with the global mean riverine DSi concentration of 150 mu mol liter(-1), 16% of the gross riverine Si load is delivered to the world ocean as BSi. Most of this BSi would be remobilized by dissolution in marine environments. These results demonstrate that the contribution of biogenic silica carried in suspension by rivers is an important component in the world ocean Si budget that has not been recognized previously.