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RESEARCH ARTICLE
Contents Vol 60(5)

Seasonal nitrogen dynamics in a seepage lake receiving high nitrogen loads

Elisa Piña-Ochoa A B and Miguel Álvarez-Cobelas A
+ Author Affiliations
- Author Affiliations

A Institute of Natural Resources-CSIC, Serrano 115 dpdo., E-28006 Madrid, Spain.

B Corresponding author. Email: elisap@ccma.csic.es

Marine and Freshwater Research 60(5) 435-445 https://doi.org/10.1071/MF08098
Submitted: 26 March 2008  Accepted: 5 December 2008   Published: 25 May 2009

Abstract

Studies on nitrogen dynamics in seepage lakes are seldom undertaken, yet our understanding of the complex pattern of the nitrogen (N) cycle is complicated by its temporal and spatial heterogeneity. This research investigated temporal variation in N concentration, considering different forms of N (NO3–, NO2–, NH4+, dissolved organic N, particulate organic N) in a Spanish flowthrough seepage lake (Colgada Lake) receiving high N loads. The study was based on monthly data collected over the period 2003–2005 from lake inputs and outputs, vertical profiles at a single representative site in the middle of the lake and fluxes of NH4+ and NO3– at the sediment–water interface. The distribution of total N (TN) inputs and outputs did not follow a clear temporal pattern. TN inputs varied from 27.70 to 125 tonnes N month–1, 75–84% of which is NO3–. Temporal variation of concentration profiles for different N forms measured showed significant differences owing to stratification. Ammonium always entered the sediment, whereas sediments acted as either a sink or source of NO3–. Fluctuation in N dynamics in this lake was more influenced by external factors, such as the input variability, than by the turnover of nitrogenous substances in the water body. Comparing seasonal N dynamics, there seems to be temporal differences between seepage lakes and drainage lakes. In seepage lakes, dissolved inorganic nitrogen (DIN) peaks were reached in early spring and after overturn, whereas in drainage lakes, the autumn minimum gradually increased to maxima in late winter and during the stratification period.

Additional keywords: dissolved nitrogen, nitrogen cycle, particulate nitrogen, sediments, water stratification.


Acknowledgements

The technical staff of Lagunas de Ruidera Natural Park is gratefully acknowledged for assistance. Field and laboratory help by Palmira Riolobos, Eva López and José María Alonso is acknowledged. Javier Vidal (Univ. Girona, Spain) is thanked for help with the ADCP. E. Piña was aided in scuba-diving by J. A. Quevedo. This study was supported by a predoctoral fellowship to E. Piña-Ochoa and the REN-2002–00558 Project of the Spanish Ministry of Education and Science.


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