Effects of soil compaction and organic carbon content on preferential flow in loamy field soils

Antonio Soares, Per Moldrup, Anders L. Vendelboe, Sheela Katuwal, Trine Norgaard, Cristina Delerue-Matos, Markus Tuller, Lis W. De Jonge

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Preferential flowand transport throughmacropores affect plant water use efficiency and enhance leaching of agrochemicals and the transport of colloids, thereby increasing the risk for contamination of groundwater resources. The effects of soil compaction, expressed in terms of bulk density (BD), and organic carbon (OC) content on preferential flow and transport were investigated using 150 undisturbed soil cores sampled from 15 15-mgrids on two field sites. Both fields had loamy textures, but one site had significantly higher OC content. Leaching experiments were conducted in each core by applying a constant irrigation rate of 10mmh-1 with a pulse application of tritium tracer. Five percent tritium mass arrival times and apparent dispersivities were derived from each of the tracer breakthrough curves and correlated with texture, OC content, and BD to assess the spatial distribution of preferential flow and transport across the investigated fields. Soils fromboth fields showed strong positive correlations between BD and preferential flow. Interestingly, the relationships between BD and tracer transport characteristics were markedly different for the two fields, although the relationship between BD and macroporosity was nearly identical. The difference was likely caused by the higher contents of fines and OC at one of the fields leading to stronger aggregation, smaller matrix permeability, and a more pronounced pipe-like pore system with wellaligned macropores.

Original languageEnglish (US)
Pages (from-to)10-20
Number of pages11
JournalSoil Science
Volume180
Issue number1
DOIs
StatePublished - Jan 11 2015

Keywords

  • Preferential flow
  • bulk density
  • chemical transport
  • hydraulic conductivity
  • macropores
  • organic carbon

ASJC Scopus subject areas

  • Soil Science

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    Soares, A., Moldrup, P., Vendelboe, A. L., Katuwal, S., Norgaard, T., Delerue-Matos, C., Tuller, M., & De Jonge, L. W. (2015). Effects of soil compaction and organic carbon content on preferential flow in loamy field soils. Soil Science, 180(1), 10-20. https://doi.org/10.1097/SS.0000000000000105