Evidence for the seasonal accumulation of carbon-rich dissolved organic material, its scale in comparison with changes in particulate material and the consequential effect on net C/N assimilation ratios
- 作者：Williams ; Peter J. leB.
- 刊名：Marine Chemistry
- 出版年：1995
- 期刊代码：50_03044203
- 类别：env
- 出版时间：September, 1995
- 卷：51
- 期：1
- 页码：17-29
- 文件大小：867 K
摘要
An analysis is made of the seasonal cycles of particulate and dissolved organic carbon and nitrogen. Data are taken from four published works (Duursma, E.K., 1961. Neth. J. Sea Res., 1: 1-147; Parsons, T.R. LeBrasseur, R.J. and Barraclough, W.E., 1970. J. Fish. Board Can., 27: 1251-1264; Banoub, M.W. and Williams P.J. leB., 1973. J. Mar. Biol. Assoc. UK, 53: 695-703; and Butler, E.I., 1979. Estuarine Coastal Mar. Sci., 8: 195-197) and one internal report (Scripps Inst. Oceanogr. Ref., 68-20). They illustrate that the seasonal increase of the dissolved organic fraction (DOM) at all the sites studied is comparable to or exceeds that of the particulate fraction. The analysis revealed a mid-to late-summer accumulation of C-rich DOM, with C/N ratios twice or more the Redfield value of 6.6. It is illustrated that the formation of this C-rich material would give rise to net inorganic carbon and nitrogen assimilation ratios as high as 14:1, as such the could be the basis of high reported C/N assimilation ratios. Nitrogen limitation is speculated as a cause for the accumulation of the C-rich material. It is argued that systematic errors in the analytical methods would not give the patterns observed.