Abstract
Stores and flows of carbon, phosphorus and nitrogen in a littoral Equisetum stand were studied in 1978–1980 in the oligotrophic, mesohumic lake Pääjärvi, southern Finland. The major carbon and nutrient stores were sediment and Equisetum. The seasonal cycle of the macrophyte vegetation had a profound influence on the whole littoral ecosystem. In spring, when only dead remains of Equisetum were present above ground, there were few differences in nutrient, chlorophyll a and zooplankton concentrations between the littoral and the open lake; phytoplankton and epiphytes were the major producers.
In early June, when new shoots of Equisetum reached the water surface, water exchange between the littoral and the open lake started to diminish, and the characteristic features of a closed macrophyte zone gradually developed: by August the P, Chl a and zooplankton concentrations in the littoral were 5–10 times those in the open lake. From late June until autumn Equisetum was overwhelmingly dominant both in biomass and in production.
The measured total primary production and respiration values indicated a high rate of internal cycling of carbon and nutrients. The daily P requirements of plant growth exceeded the total P stored in the water by a factor of 2–4, and also exceeded the release of nutrients in excretion. High N:P ratios in the water (total 10–64, inorganic 18–171) suggested that P was probably always the limiting nutrient.
The P content of the annual production of Equisetum in Pääjärvi was 2.3% of the mean annual P load, and 5.3% of the mean total P storage in the water volume of the lake.
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Sarvala, J., Kairesalo, T., Koskimies, I., Lehtovaara, A., Ruuhijärvi, J., Vähä-Piikkiö, I. (1982). Carbon, phosphorus and nitrogen budgets of the littoral Equisetum belt in an oligotrophic lake. In: Ilmavirta, V., Jones, R.I., Persson, PE. (eds) Lakes and Water Management. Developments in Hydrobiology 7, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-8003-7_6
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DOI: https://doi.org/10.1007/978-94-009-8003-7_6
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