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  • 1
    Electronic Resource
    Electronic Resource
    Decomposition of water hyacinth detritus in eutrophic lake water (1991)
    Springer
    Hydrobiologia 211 (1991), S. 101-109 
    Details
    ISSN: 1573-5117
    Keywords: aquatic plants ; Eichhornia crassipes ; eutrophic lake water ; biomass ; carbon mineralization ; nitrogen mineralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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**).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037366
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  • 2
    Electronic Resource
    Electronic Resource
    Water hyacinth productivity and detritus accumulation (1988)
    Springer
    Hydrobiologia 157 (1988), S. 179-185 
    Details
    ISSN: 1573-5117
    Keywords: eutrophic lake water ; nitrogen assimilation ; nitrogen balance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006970
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  • 3
    Electronic Resource
    Electronic Resource
    Nitrogen dynamics in a eutrophic lake sediment (1988)
    Springer
    Hydrobiologia 159 (1988), S. 177-188 
    Details
    ISSN: 1573-5117
    Keywords: eutrophic lake water ; nitrogen flux ; anaerobic sediment ; simulation model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nitrogen flux from sediment of a shallow lake and subsequent utilization by water hyacinth (Eichhornia crassipes [Mart] Solms) present in the water column were evaluated using an outdoor microcosm sediment-water column. Sediment N was enriched with 15N to quantitatively determine the movement of NH4-N from the sediment to the overlying water column. During the first 30 days. 48% of the total N uptake by water hyacinth was derived from sediment 15NH4-N. This had decreased to 14% after 183 days. Mass balance of N indicates that about 25% sediment NH4-N was released into the overlying water, but only 17% was assimilated by water hyacinth. NH4-N levels in the water column were very low, with very little or no concentration gradients. NH4-N levels in the interstitial water of the sediment were in the range of 30–35 mg L−1 for the lower depths (〉 35 cm), while in the surface 5 cm of depth NH4-N levels decreased to 3.2 mg L−1. Simulated results also showed similar trends for the interstitial NH4-N concentration of the sediment. The overall estimated NH4-N flux from the sediment to the overlying water was 4.8 µg cm−2 day−1, and the soluble organic N flux was 5.8 µg N cm−2 day−1. Total N flux was 10.6 µg N cm−2 day−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014726
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