Indicators of nitrate in wetland surface and soil-waters: Interactions of vegetation and environmental factors

M. P. Kennedy, K. J. Murphy

Research output: Contribution to journalArticle

10 Citations (Scopus)
3 Downloads (Pure)

Abstract

This paper describes a new bio-indicator method for assessing wetland ecosystem health; as such, the study is particularly relevant to current legislation such as the EU Water Framework Directive, which provides a baseline of the current status of surface waters. Seven wetland sites were monitored across northern Britain, with model construction data for predicting eco-hydrological relationships collected from five sites during 1999. Two new sites and one repeat site were monitored during 2000 to provide model test data. The main growing season for the vegetation, and hence the sampling period, was May-August during both years. Seasonal mean concentrations of nitrate (NO3 -) in surface and soil water samples during 1999 ranged from 0.01 to 14.07 mg N 1-1, with a mean value of 1.01 mg N 1-1. During 2000, concentrations ranged from trace level (< 0.01 mg N 1-1) to 9.43 mg N 1-1, with a mean of 2.73 mg N 1-1. Surface and soil-water nitrate concentrations did not influence plant species composition significantly across representative tall herb fen and mire communities. Predictive relationships were found between nitrate concentrations and structural characteristics of the wetland vegetation, and a model was developed which predicted nitrate concentrations from measures of plant diversity, canopy structure and density of reproductive structures. Two further models, which predicted stem density and density of reproductive structures respectively, utilised nitrate concentration as one of the independent predictor variables. Where appropriate, the models were tested using data collected during 2000. This approach is complementary to species-based monitoring, representing a useful and simple tool to assess ecological status in target wetland systems and has potential for bio-indication purposes.

Original languageEnglish
Pages (from-to)663-672
Number of pages10
JournalHydrology and Earth System Sciences
Volume8
Issue number4
DOIs
Publication statusPublished - Aug 2004
Externally publishedYes

Bibliographical note

Publisher Statement: This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Keywords

  • Bio-indicators
  • Surface water
  • Water quality
  • Wetland vegetation

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Water Science and Technology

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