. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DECOMPOSITION OF SPARTINA 61 TABLE III Total nitrogen inputs and outputs during aerobic decomposition o/Spartina alterniflora litter in a flow-through percolator at 20° C for four months. Weight (mg) Mean % of total input nitrogen Mean % of initial litter nitrogen Input: Initial Litter Nitrogen Ammonia Utilized 63 ± 98 ± 39 61 100 156 Total Nitrogen Input 161 ± — 256 Output: Final Litter Nitrogen Nitrate Produced 43 ± 52 ± 25 29 68 82 Nitrite Produced 2 ± 1 2 Nitrogen (TON) Total Nitrogen Output 74 ±
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DECOMPOSITION OF SPARTINA 61 TABLE III Total nitrogen inputs and outputs during aerobic decomposition o/Spartina alterniflora litter in a flow-through percolator at 20° C for four months. Weight (mg) Mean % of total input nitrogen Mean % of initial litter nitrogen Input: Initial Litter Nitrogen Ammonia Utilized 63 ± 98 ± 39 61 100 156 Total Nitrogen Input 161 ± — 256 Output: Final Litter Nitrogen Nitrate Produced 43 ± 52 ± 25 29 68 82 Nitrite Produced 2 ± 1 2 Nitrogen (TON) Total Nitrogen Output 74 ± 173 ± 43 117 275 the decomposing litter was from external sources (ammonia-N). A significant quan- tity of ammonia-nitrogen was converted to nitrite and nitrate through microbial nitrification processes. The largest quantity of nitrogen exported, however, was in the form of either dissolved organics, suspended micro-particulates, or microbial biomass; this was 43% of the total output nitrogen (TON). The large fraction of the nitrogen that appeared as TON could be attributed to the leaching of non- senescent grass which I used as my source of litter. The TOC may likewise have been affected by this type of litter. Gross changes in chemical components About 20 to 25% of the carbon was leached as dissolved carbon in the initial stages of the decomposition (Fig. 4). Afterwards, carbon was lost at a steady rate LITTER WATER(TOC) AIR(CO2). 20 40 60 80 TIME(days) 100 120 FIGURE 4. Cumulative amounts of carbon gained or lost by Spartina alterniflora litter during aerobic decomposition in a percolator at 20° Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Fra
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