Interrelationship Between Nutrients And Chlorophyll-a in an Urban Stormwater Lake During The Ice-Covered Period

  • Kejian Chu College of Environment, Hohai University, Nanjing, P. R. China and Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada
  • Yuntong She Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada
  • Jeff Kemp 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 Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada

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 under 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 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 the stormwater lake during the ice-covered period.

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Published
2017-10-22
How to Cite
CHU, Kejian et al. Interrelationship Between Nutrients And Chlorophyll-a in an Urban Stormwater Lake During The Ice-Covered Period. Journal of Contemporary Urban Affairs, [S.l.], v. 1, n. 3, p. 24-30, oct. 2017. ISSN 2475-6164. Available at: <http://ijcua.com/index.php/ijcua/article/view/48>. Date accessed: 18 nov. 2017.
Section
Third International Conference on Environment, Engineering & Energy ,Toronto, Ca