Organic carbon accumulation nitrogen

On the basis of the bulk sediment accumulation rates and the measured C, N, and P contents in the sediment cores, the accumulation rates for the single elements organic carbon, total nitrogen, and total phosphorus were calculated. 

The basinwide mean values for organic carbon, total nitrogen, and total phosphorus (expressed in g/(m year)) are 14.8 13.7, 1.60 1.58, and 0.20 0.18, respectively. Because the element concentrations (e.g., TOC, Fig. 14.10 top left) are much less variable than the bulk sediment accumulation rates (Fig. 14.8), the spatial distribution pattern of element accumulation rates mainly reflects the total mass accumulation rates. 

The bacteria will remain nitrogen limited as long as BCD is smaller than the carbon supply rate y/c + (C N)sy/N. The surplus production of organic carbon would accumulate at a rate R ... 

Of the organic carbon entering the ocean, about 35% accumulated in marine sediments as organic carbon with a molar C/N/P ratio of about 250/20/1 (Mackenzie, 1981) the rest was respired and oxidized to CO2 and evaded the ocean. The nitrogen and phosphorus riverine fluxes of 1 and 0.045 x 1012 moles y1, respectively, represented the nutrient fluxes necessary to support the organic matter accumulation of 11.7 x 1012 moles C y1. 

S0ndergaard, M., Wtihams, P. J. L. B., Cauwet, G., Riemarm, B., Robinson, C., Terzic, S., Woodward, E. M. S., and Worm, J. (2000). Net accumulation and flux of dissolved organic carbon and dissolved organic nitrogen in marine plankton communities. Limnol. Oceanogr. 45(5), 1097-1111. 

FIGURE 14.14 Sedimentary fluxes of total organic carbon (TOC), total nitrogen (TN), and total phosphoms (TP) subdivided into vertical flux (1), near bottom lateral input (2), release flux back to the water (3), and sediment net accumulation (4) in surface sediments of the Eastern Gotland Basin below 150-m water depth. Arrow thickness indicates the relative proportion of lateral and vertical input and release. The gray hue represents the sediment surface. 

TABLE 4 Estimated Rates of Organic Carbon and Total Nitrogen Accumulation in Soils (0- to 20-cm Depth) Developing Beneath Woody Plants Establishing on a Former Grassland... 

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