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Decomposition of water hyacinth detritus in eutrophic lake water

✍ Scribed by K. R. Reddy; W. F. DeBusk

Publisher
Springer
Year
1991
Tongue
English
Weight
914 KB
Volume
211
Category
Article
ISSN
1573-5141

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✦ Synopsis

A study was conducted to determine the seasonal production of detritus by water hyacinths [Eichhomia 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-' yr ', respectively.

Decomposition rates were faster in the root zone of hyacinth mats than at the sediment-water interface. Approximately 92 y0 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' = 0.947**), C/N ratio (r2 = 0.644**) and C/P ratio (r2 = 0.428**).

' Florida Agricultural Experiment Stations Journal Series No. R-00348.

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