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Water hyacinth productivity and detritus accumulation

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Abstract

Water hyacinth [Eichhornia crassipes (Mart) Solms] productivity and detritus accumulation were evaluated in eutrophic lake water with and without added nutrients (fertilized and control reservoirs, respectively). Seasonal changes in plant productivity and detritus accumulation were determined at monthly intervals for one year.

Significant differences were observed in plant productivity between seasons and nutrient additions. Seasonal plant productivity ranged from 1.9 to 23.1 mg (dry wt) ha−1 for the fertilized reservoir and −0.2 to 10.2 mg ha−1 for the control reservoir. Detritus accumulation was not significantly different between seasons or nutrient additions. Seasonal N assimilation by plants ranged from 34 to 242 kg N ha−1 for plants in the fertilized reservoir and < 0 to 104 kg N ha−1 for plants in the control reservoir. Annual net N recovered in detritus represented 21 and 28% of the total N removed by plants in the fertilized and control reservoirs, respectively. Net N loading to the reservoirs from detritus was 92 to 148 kg N ha−1 yr−1.

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Moorhead, K.K., Reddy, K.R. & Graetz, D.A. Water hyacinth productivity and detritus accumulation. Hydrobiologia 157, 179–185 (1988). https://doi.org/10.1007/BF00006970

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  • DOI: https://doi.org/10.1007/BF00006970

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