, Volume 31, Issue 2, pp 309–318 | Cite as

Mapping Soil Pore Water Salinity of Tidal Marsh Habitats Using Electromagnetic Induction in Great Bay Estuary, USA

  • Gregg E. MooreEmail author
  • David M. Burdick
  • Chris R. Peter
  • Donald R. Keirstead


Electromagnetic induction was used to measure apparent conductivity of soil pore water within 15 oligohaline to polyhaline tidal marshes of the Great Bay Estuary in New Hampshire, USA. The instrument was linked to a differential global positioning system via a hand-held field computer to geo-reference data. Apparent conductivity was converted to salinity using a regression derived from field data, and mapped to illustrate spatial salinity gradients throughout the marshes. Plant communities occurring at the study sites included native low marsh, high marsh, and brackish tidal riverbank marsh, as well as communities dominated by native and non-native common reed, Phragmites australis. Results revealed mean salinity values were significantly different between each of the community categories sampled within the Estuary. Due to management concerns over expansion of Phragmites within the Estuary, we mapped the salinity range for this community and provided graphic and numerical estimates of potential Phragmites habitat based on salinity alone (26% of the total acreage surveyed). Electromagnetic induction is an efficient tool for rapid reconnaissance of apparent conductivity and salinity gradients in tidal marsh soils that can be superimposed on aerial imagery to estimate suitable habitat for restoration or invasive control based on salinity ranges.


Apparent conductivity Management Phragmites australis Tidal marsh pools 



We thank James Doolittle of the United States Department of Agriculture Natural Resources Conservation Service National Soil Survey Center for technical assistance with the EM38 instrument and for helpful comments on the manuscript, as well as Don Richard for technical support with modeling data output in GIS. We thank David Shay of Jackson Estuarine Laboratory for tireless field assistance, and four anonymous reviewers for their helpful suggestions to improve the manuscript. This work was supported by the United States Department of Agriculture Natural Resources Conservation Service (Federal Award # 721428–6A380) and the New Hampshire Fish and Game Department. Published as Scientific Contribution Number 501 from the Jackson Estuarine Laboratory and Center for Marine Biology at the University of New Hampshire.


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Copyright information

© Society of Wetland Scientists 2011

Authors and Affiliations

  • Gregg E. Moore
    • 1
    • 2
    Email author
  • David M. Burdick
    • 1
    • 3
  • Chris R. Peter
    • 1
  • Donald R. Keirstead
    • 4
  1. 1.Jackson Estuarine LaboratoryUniversity of New HampshireDurhamUSA
  2. 2.Department of Biological SciencesDurhamUSA
  3. 3.Department of Natural Resources and the EnvironmentDurhamUSA
  4. 4.United States Department of Agriculture, Natural Resources Conservation ServiceDurhamUSA

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