Measuring biogeochemical heterogeneity at the micro scale in soils and sediments

Lasse L. Pedersen, Barth F. Smets, Arnaud Dechesne

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Steep physiochemical gradients and diffusive limitation associated with microscale features such as cracks and pores make soil and sediments remarkably heterogeneous environments, which is reflected on many environmentally important processes. If we are to understand and attempt to control the ecology of the microorganisms which inhabit these environments we must not only characterize their inhabitants, but also the complex biogeochemical landscape they live in. This includes local concentrations of electron acceptors and donors, microbial metabolites and key physical and chemical parameters such as pH and soil structure.To this end, an array of techniques for collecting data at the microscale has been developed, deployed and refined, ranging from microsensor probes to planar sensors. This review provides a general reference for and a critical comparison of microscale techniques available to the fields of soil and sediment microbial ecology. Techniques are evaluated based on their ability to provide spatially resolved data at the microscale, with focus on performance characteristics, potential for repeated measurements, degree of physical disruption they create, and accessibility.Microscale studies have given us many insights, but we outline further progress needed to make the microscale toolkit more accessible and to extend the range of analytes that can be measured simultaneously, so that we may expand our knowledge of the complex environmental microscale heterogeneity and its impact on soil and sediment ecology and functioning.
Original languageEnglish
JournalSoil Biology & Biochemistry
Volume90
Pages (from-to)122-138
Number of pages17
ISSN0038-0717
DOIs
Publication statusPublished - 2015

Keywords

  • Soil Science
  • Microbiology
  • Gradients
  • Microsensor
  • Optode
  • Planar sensor
  • Spatial
  • Biogeochemistry
  • Ecology
  • Metabolites
  • Microsensors
  • Soils
  • Heterogeneous environments
  • Micro-scale heterogeneity
  • Performance characteristics
  • Physical and chemical parameters
  • Planar sensors
  • Sediments

Cite this