Decomposition of water hyacinth detritus in eutrophic lake water |
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Authors: | K R Reddy W F DeBusk |
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Institution: | (1) Institute of Food and Agricultural Sciences, Soil Science Department, University of Florida, 32611 FL, Gainesville, USA |
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Abstract: | A study was conducted to determine the seasonal production of detritus by water hyacinths Eichhornia crassipes (Mart.) Sohns] cultured in eutrophic Lake Apopka water, and the decomposition of detritus in situ and under laboratory conditions. Annual averages for C, N and P deposited through detritus production at the sediment-water interface were 2870, 176 and 19 kg ha-1 yr-1, respectively.Decomposition rates were faster in the root zone of hyacinth mats than at the sediment-water interface. Approximately 92% of the detritus C deposited at the sediment-water interface was decomposed in one year, while only 11% of the detrital organic N was mineralized. Detrital tissue gained P during decomposition, suggesting P limitation for the system. Dry-weight loss of detrital tissue was significantly correlated with the mass of C lost (r
2 = 0.947**), C/N ratio (r
2 = 0.644**) and C/P ratio (r
2 = 0.428**).Florida Agricultural Experiment Stations Journal Series No. R-00348. |
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Keywords: | aquatic plants Eichhornia crassipes eutrophic lake water biomass carbon mineralization nitrogen mineralization |
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