Burned and unburned peat water repellency: Implications for peatland evaporation following wildfire

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Burned and unburned peat water repellency : Implications for peatland evaporation following wildfire. / Kettridge, N.; Humphrey, R. E.; Smith, J. E.; Lukenbach, M. C.; Devito, K. J.; Petrone, R. M.; Waddington, J. M.

In: Journal of Hydrology, Vol. 513, 26.05.2014, p. 335-341.

Research output: Contribution to journalArticlepeer-review

Harvard

Kettridge, N, Humphrey, RE, Smith, JE, Lukenbach, MC, Devito, KJ, Petrone, RM & Waddington, JM 2014, 'Burned and unburned peat water repellency: Implications for peatland evaporation following wildfire', Journal of Hydrology, vol. 513, pp. 335-341. https://doi.org/10.1016/j.jhydrol.2014.03.019

APA

Kettridge, N., Humphrey, R. E., Smith, J. E., Lukenbach, M. C., Devito, K. J., Petrone, R. M., & Waddington, J. M. (2014). Burned and unburned peat water repellency: Implications for peatland evaporation following wildfire. Journal of Hydrology, 513, 335-341. https://doi.org/10.1016/j.jhydrol.2014.03.019

Vancouver

Author

Kettridge, N. ; Humphrey, R. E. ; Smith, J. E. ; Lukenbach, M. C. ; Devito, K. J. ; Petrone, R. M. ; Waddington, J. M. / Burned and unburned peat water repellency : Implications for peatland evaporation following wildfire. In: Journal of Hydrology. 2014 ; Vol. 513. pp. 335-341.

Bibtex

@article{fd30efa312d24060bc2780b85cf88a13,
title = "Burned and unburned peat water repellency: Implications for peatland evaporation following wildfire",
abstract = "Water repellency alters soil hydrology after periods of wildfire, potentially modifying the ecosystem recovery to such disturbance. Despite this potential importance, the extent and severity of water repellency within burned peatlands and its importance in regulating peatland recovery to wildfire disturbance remains poorly understood. We characterised the water repellency of peat in a burned (one year post-fire) and unburned peatland in the Western Boreal Plain utilising the water drop penetration time and ethanol droplet molarity tests. Burned Sphagnum moss and feather moss sites had a more severe degree of water repellency than unburned sites, with differences being more pronounced between burned and unburned feather moss sites. Burned feather moss exhibited the most extreme water repellency, followed by unburned feather moss, and burned Sphagnum. The severity of water repellency varied with depth through the near surface of the moss/peat profile. This was most evident within the burned feathermoss where more extreme water repellency was observed at the near-surface compared to the surface, with the most extreme water repellency found at 1 and 5. cm depths. Unburned Sphagnum was completely hydrophilic at all depths. We suggest that the extreme water repellency in near-surface feather moss peat acts as a barrier that impedes the supply of water to the surface that replaces that lost via evaporation. This leads to drying of the near-surface vadose zone within feather moss areas and a concomitantly large decrease in peatland evaporation within feather moss dominated peatlands. This negative feedback mechanism likely enhances the resilience of such peatland to wildfire disturbance, maintaining a high water table position, thereby limiting peat decomposition. In comparison, such a feedback is not observed strongly within Sphagnum, leaving Sphagnum dominated peatlands potentially vulnerable to low water table positions post disturbance.",
keywords = "Evaporation, Feather moss, Hydrophobicity, Sphagnum, Water repellency, Wildfire",
author = "N. Kettridge and Humphrey, {R. E.} and Smith, {J. E.} and Lukenbach, {M. C.} and Devito, {K. J.} and Petrone, {R. M.} and Waddington, {J. M.}",
year = "2014",
month = may,
day = "26",
doi = "10.1016/j.jhydrol.2014.03.019",
language = "English",
volume = "513",
pages = "335--341",
journal = "Journal of Hydrology",
issn = "0022-1694",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Burned and unburned peat water repellency

T2 - Implications for peatland evaporation following wildfire

AU - Kettridge, N.

AU - Humphrey, R. E.

AU - Smith, J. E.

AU - Lukenbach, M. C.

AU - Devito, K. J.

AU - Petrone, R. M.

AU - Waddington, J. M.

PY - 2014/5/26

Y1 - 2014/5/26

N2 - Water repellency alters soil hydrology after periods of wildfire, potentially modifying the ecosystem recovery to such disturbance. Despite this potential importance, the extent and severity of water repellency within burned peatlands and its importance in regulating peatland recovery to wildfire disturbance remains poorly understood. We characterised the water repellency of peat in a burned (one year post-fire) and unburned peatland in the Western Boreal Plain utilising the water drop penetration time and ethanol droplet molarity tests. Burned Sphagnum moss and feather moss sites had a more severe degree of water repellency than unburned sites, with differences being more pronounced between burned and unburned feather moss sites. Burned feather moss exhibited the most extreme water repellency, followed by unburned feather moss, and burned Sphagnum. The severity of water repellency varied with depth through the near surface of the moss/peat profile. This was most evident within the burned feathermoss where more extreme water repellency was observed at the near-surface compared to the surface, with the most extreme water repellency found at 1 and 5. cm depths. Unburned Sphagnum was completely hydrophilic at all depths. We suggest that the extreme water repellency in near-surface feather moss peat acts as a barrier that impedes the supply of water to the surface that replaces that lost via evaporation. This leads to drying of the near-surface vadose zone within feather moss areas and a concomitantly large decrease in peatland evaporation within feather moss dominated peatlands. This negative feedback mechanism likely enhances the resilience of such peatland to wildfire disturbance, maintaining a high water table position, thereby limiting peat decomposition. In comparison, such a feedback is not observed strongly within Sphagnum, leaving Sphagnum dominated peatlands potentially vulnerable to low water table positions post disturbance.

AB - Water repellency alters soil hydrology after periods of wildfire, potentially modifying the ecosystem recovery to such disturbance. Despite this potential importance, the extent and severity of water repellency within burned peatlands and its importance in regulating peatland recovery to wildfire disturbance remains poorly understood. We characterised the water repellency of peat in a burned (one year post-fire) and unburned peatland in the Western Boreal Plain utilising the water drop penetration time and ethanol droplet molarity tests. Burned Sphagnum moss and feather moss sites had a more severe degree of water repellency than unburned sites, with differences being more pronounced between burned and unburned feather moss sites. Burned feather moss exhibited the most extreme water repellency, followed by unburned feather moss, and burned Sphagnum. The severity of water repellency varied with depth through the near surface of the moss/peat profile. This was most evident within the burned feathermoss where more extreme water repellency was observed at the near-surface compared to the surface, with the most extreme water repellency found at 1 and 5. cm depths. Unburned Sphagnum was completely hydrophilic at all depths. We suggest that the extreme water repellency in near-surface feather moss peat acts as a barrier that impedes the supply of water to the surface that replaces that lost via evaporation. This leads to drying of the near-surface vadose zone within feather moss areas and a concomitantly large decrease in peatland evaporation within feather moss dominated peatlands. This negative feedback mechanism likely enhances the resilience of such peatland to wildfire disturbance, maintaining a high water table position, thereby limiting peat decomposition. In comparison, such a feedback is not observed strongly within Sphagnum, leaving Sphagnum dominated peatlands potentially vulnerable to low water table positions post disturbance.

KW - Evaporation

KW - Feather moss

KW - Hydrophobicity

KW - Sphagnum

KW - Water repellency

KW - Wildfire

UR - http://www.scopus.com/inward/record.url?scp=84899029304&partnerID=8YFLogxK

U2 - 10.1016/j.jhydrol.2014.03.019

DO - 10.1016/j.jhydrol.2014.03.019

M3 - Article

AN - SCOPUS:84899029304

VL - 513

SP - 335

EP - 341

JO - Journal of Hydrology

JF - Journal of Hydrology

SN - 0022-1694

ER -