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A mass balance assessment of the contribution of floating-leaved macrophytes in nutrient stocks in an eutrophic macrophyte-dominated lake
Marion, L.; Paillisson, J.-M. (2003). A mass balance assessment of the contribution of floating-leaved macrophytes in nutrient stocks in an eutrophic macrophyte-dominated lake. Aquat. Bot. 75(3): 249-260. dx.doi.org/10.1016/s0304-3770(02)00177-8
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Accumulation; Biomass; Eutrophic lakes; Nitrogen; Nutrient cycles; Nutrients (mineral); Phosphorus; Shallow water; Nymphaea alba; Nymphoides peltata; Trapa natans L. [WoRMS]; France, Pays de Loire, Grand-Lieu L. [Marine Regions]; Fresh water

Authors  Top 
  • Marion, L.
  • Paillisson, J.-M., correspondent

Abstract
    In this study we examine the contribution of three floating-leaved macrophyte species, Nymphaea alba, Trapa natans and Nymphoides peltata (covering about 700-750 ha), in the N and P stocks in a shallow eutrophic lake (4000-6300 ha) during a 3-year period (1995-1997). The monthly nutrient standing stocks in the above-ground structures of the plants were derived from biomass, nutrient content and area covered by each plant species during the growth period. These N and P quantities were compared to the net nutrient inputs of the lake waters from the catchment area recorded in the winter (water discharging phase), preceding the vegetation period. N and P contents reached high values for the three species (2.16-3.23% N and 0.29-0.68% P) showing the ability of the plants to accumulate large nutrient contents. Despite significant annual fluctuations in nutrient contents and biomass, not always in the same way for each floating-leaved macrophyte, and changes in the area they covered, the maximum monthly P stocks in the plants were globally uniform between the 3 years (7.10-8.85 tonnes). Maximum values for N ranged from 40.85 to 54.55 tonnes in summer. The vast beds of N. alba (until 75% of the total area in 1997), contributed largely to these annual nutrient stocks (50-72% and 46-70%, respectively, for N and P). Whereas the nutrient stocks estimated in the plants during the biomass peak represented little proportions of the annual net flux of N in the lake waters (3.35-5.00%), they reached high proportions for P sometimes exceeding the annual net loading of P in the lake according to years (16.80-156.25%). These results suggest that the nutrient-enriched sediments of the lake (6-53 and 2-6 times the net annual P and N inputs) probably compensate for annual variations in the external nutrient loading, notably for P, and floating-leaved macrophytes are likely not limited when the inputs from the catchment area are small.

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