Jump to main content
Jump to site search


Establishment of stream nutrient criteria by comparing reference conditions with ecological thresholds in a typical eutrophic lake basin

Author affiliations

Abstract

The establishment of numeric nutrient criteria is essential to aid the control of nutrient pollution and for protecting and restoring healthy ecological conditions. However, it's necessary to determine whether regional nutrient criteria can be defined in stream ecosystems with a poor ecological status. A database of periphytic diatom samples was collected in July and August 2011 and 2012. In total 172 samples were included in the database with matching environmental variables. Here, percentile estimates, nonparametric change-point analysis (nCPA) and Threshold Indicator Taxa ANalysis (TITAN) were conducted to detect the reference conditions and ecological thresholds along a total nitrogen (TN) and total phosphorus (TP) gradient and ammonia nitrogen (NH3-N) for the development of nutrient criteria in the streams of the Lake Dianchi basin. The results highlighted the possibility of establishing regional criteria for nutrient concentrations, which we recommended to be no more than 1.39 mg L−1 for TN, 0.04 mg L−1 for TP and 0.17 mg L−1 for NH3-N to prevent nuisance growths of tolerant taxa, and 0.38 mg L−1 for TN, 0.02 mg L−1 for TP and 0.02 mg L−1 for NH3-N to maintain high quality waters in streams. Additionally, the influence of excessive background nutrient enrichment on the threshold response, and the ecological interaction with other stressors (HQI, etc.) in the nutrient dynamic process need to be considered to establish the eventual nutrient criteria, regardless of which technique is applied.

Graphical abstract: Establishment of stream nutrient criteria by comparing reference conditions with ecological thresholds in a typical eutrophic lake basin

Back to tab navigation

Supplementary files

Publication details

The article was received on 13 Feb 2017, accepted on 23 Oct 2017 and first published on 24 Oct 2017


Article type: Paper
DOI: 10.1039/C7EM00074J
Citation: Environ. Sci.: Processes Impacts, 2017, Advance Article
  •   Request permissions

    Establishment of stream nutrient criteria by comparing reference conditions with ecological thresholds in a typical eutrophic lake basin

    X. Cao, J. Wang, D. Jiang, J. Sun, Y. Huang and S. Luan, Environ. Sci.: Processes Impacts, 2017, Advance Article , DOI: 10.1039/C7EM00074J

Search articles by author

Spotlight

Advertisements