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Communication at the NABS Annual meeting, Keystone, 2000
(405) STORAGE AND PROCESSING OF PARTICULATE ORGANIC MATTER IN A COASTAL PLAIN STREAM ECOSYSTEM: A MODEL USING STELLA II.
H.S. Jin and G.M. Ward. Department of Biological Sciences, University of Alabama, Tuscaloosa, AL 35487
A simple model simulating storage and processing of particulate organic matter in Payne Creek was developed using STELLA II. Our model was a modification of an organic matter processing model by Boling et al. (1975). Litterfall (leaves and needles) from Payne Creek (0.06 g to 9.3 g m-2day-1) was incorporated as organic matter input. The proportion of leaching (0.2), daily fragmentation rate (0.006) of CPOM, and maximum respiration rates (0.01) of CPOM and FPOM were obtained from literatures values. Mean daily water temperature at Payne Creek (10 to 23 ºC) was incorporated as the regulator of respiration. Our initial run produced stable annual cycles for storage of both CPOM and FPOM beginning the third year. CPOM storage sharply increased in October and reached a peak at late November when the litterfall was maximum, while the minimum was in late July. Although FPOM storage didn't show any dramatic changes, there was an annual maximum and minimum in March and September, respectively. Benthic organic matter samples taken from Payne Creek showed a similar pattern from summer to late fall. On-going studies of respiration and CPOM fragmentation should improve the accuracy of the model.
Presented at 1:00 PM on Wednesday, May 31, 2000 in Organic Matter Processing
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