Long-term effects of peatland cultivation on soil physical and hydraulic properties: Case study in Canada

  • Authors: Hallema, Dennis W.; Lafond, Jonathan A.; Périard, Yann; Gumiere, Silvio J.; Sun, Ge; Caron, Jean
  • Publication Year: 2015
  • Publication Series: Scientific Journal (JRNL)
  • Source: Vadose Zone Journal. 14(6): 1-12
  • DOI: 10.2136/vzj2014.10.0147

Abstract

Organic soils are an excellent substrate for commercial lettuce (Lactuca sativa L.) farming; however, drainage accelerates oxidation of the surface layer and reduces the water holding capacity, which is often lethal for crops that are sensitive to water stress. In this case study, we analyzed 942 peat samples from a large cultivated peatland complex (18.7 km2) in southern Quebec, Canada, and demonstrated from spatial and temporal patterns that agriculture resulted in a compacted layer below the root zone. We grouped the samples based on the year in which the corresponding fields were created on the previously undisturbed peatland (cutoff years 1970, 1980, 1990, and 2000) and discovered that bulk density has continued to increase, partly due to the overburden pressure, while organic matter has continued to decline since the fields were reclaimed and drained in phases between 1955 and 2006. Saturated hydraulic conductivity (Ks) in the upper 20 cm was remarkably lower on fields older than 10 yr (p = 0.0973 for Wilcoxon rank test), with more samples having a Ks < 2.0 X 10-3 yr. Soil water available capacity (SWAC) was between approximately 5 and 33 cm on fields reclaimed after 2000, while samples from fields reclaimed before 2000 had a lower SWAC between 2 and 23 cm (groups discernable at p = 0.0203). It is possible, however, that the greatest rate of change in Ks and SWAC occurred within even a year of reclamation. The results of this study call for active measures to reduce organic soil degradation such as reducing tillage and on-field traffic or following a crop rotation scheme.

  • Citation: Hallema, Dennis W.; Lafond, Jonathan A.; Périard, Yann; Gumiere, Silvio J.; Sun, Ge; Caron, Jean 2015. Long-term effects of peatland cultivation on soil physical and hydraulic properties: Case study in Canada. Vadose Zone Journal. 14(6): 1-12. 12 p. doi:10.2136/vzj2014.10.0147
  • Keywords: MAE, mean absolute error; SWAC, soil water available capacity
  • Posted Date: September 17, 2015
  • Modified Date: September 30, 2015
  • Print Publications Are No Longer Available

    In an ongoing effort to be fiscally responsible, the Southern Research Station (SRS) will no longer produce and distribute hard copies of our publications. Many SRS publications are available at cost via the Government Printing Office (GPO). Electronic versions of publications may be downloaded, printed, and distributed.

    Publication Notes

    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
    • Our online publications are scanned and captured using Adobe Acrobat. During the capture process some typographical errors may occur. Please contact the SRS webmaster if you notice any errors which make this publication unusable.
    • To view this article, download the latest version of Adobe Acrobat Reader.