Interrelationship between nutrients and chlorophyll-a in an urban stormwater lake during the ice-covered period

Authors

  • Kejian Chu, Dr. College of Environment, Hohai University, Nanjing, P. R. China https://orcid.org/0000-0001-8641-1975
  • Yuntong She, Dr. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada https://orcid.org/0000-0002-4655-3183
  • Jeff Kemp, Dr. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada
  • Mark Loewen Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada
  • Evan Davies, Dr. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada https://orcid.org/0000-0003-0536-333X

DOI:

https://doi.org/10.25034/ijcua.2018.3675

Keywords:

Ice-covered, Chlorophyll-a, Nutrients, Urban Stormwater Lake

Abstract

Urban stormwater lakes in cold regions are ice-covered for substantial parts of the winter. It has long been considered that the ice-covered period is the “dormant season,” during which ecological processes are inactive. However, little is known about this period due to the historical focus on the open-water season. Recent pioneering research on ice-covered natural lakes has suggested that some critical ecological processes play out on the ice. The objective of this study was to investigate the active processes in ice-covered stormwater lakes. Data collected during a two-year field measurement program at a stormwater lake located in Edmonton, Alberta, Canada were analyzed. The lake was covered by ice from November to mid-April of the following year. The mean value of chlorophyll-a during the ice-covered period was 22.09% of the mean value for the open-water season, suggesting that primary productivity under the ice can be important. Nitrogen and phosphorus were remarkably higher during the ice-covered period, while dissolved organic carbon showed little seasonal variation. Under ice-covered conditions, the total phosphorus was the major nutrient controlling the ratio of total nitrogen to total phosphorus, and a significant positive correlation existed between total phosphorus and chlorophyll-a when the ratio was smaller than 10. The results provide preliminary evidence of the critical nutrient processes in Stormwater Lake during the ice-covered period.

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Published

2017-12-28

How to Cite

Chu, K., She, Y., Kemp, J., Loewen, M., & Davies, E. (2017). Interrelationship between nutrients and chlorophyll-a in an urban stormwater lake during the ice-covered period. Journal of Contemporary Urban Affairs, 1(3), 24–30. https://doi.org/10.25034/ijcua.2018.3675