Hydraulic and physical properties of managed and intact peatlands: application of the van Genuchten-Mualem models to peat soils

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dc.contributor.author Menberu, Meseret Walle
dc.contributor.author Marttila, Hannu
dc.contributor.author Ronkanen, Anna-Kaisa
dc.contributor.author Haghighi, Ali Torabi
dc.contributor.author Kløve, Bjørn
dc.date.accessioned 2021-10-04T14:15:30Z
dc.date.available 2021-10-04T14:15:30Z
dc.date.issued 2021
dc.identifier.citation Menberu, M. W., Marttila, H., Ronkanen, A.-K., Haghighi, A. T., & Kløve, B. (2021). Hydraulic and physical properties of managed and intact peatlands: Application of the van Genuchten-Mualem models to peat soils. Water Resources Research, 57, e2020WR028624. https://doi.org/10.1029/2020WR028624 fi
dc.identifier.issn 0043-1397
dc.identifier.uri http://hdl.handle.net/10138/334890
dc.description Key Points: • Land use such as agriculture and peat extraction alter the physical and hydraulic properties of the peat more strongly than other land uses • The top 30 cm peat depth was most affected by agriculture and peat extraction, as indicated by the bulk density, specific yield, and porosity values • The van Genuchten-Mualem soil water retention model was applied successfully to different layers of peat under different land use fi
dc.description.abstract Undisturbed peatlands are effective carbon sinks and provide a variety of ecosystem services. However, anthropogenic disturbances, especially land drainage, strongly alter peat soil properties and jeopardize the benefits of peatlands. The effects of disturbances should therefore be assessed and predicted. To support accurate modeling, this study determined the physical and hydraulic properties of intact and disturbed peat samples collected from 59 sites (in total 3,073 samples) in Finland and Norway. The bulk density (BD), porosity, and specific yield (Sy) values obtained indicated that the top layer (0–30 cm depth) at agricultural and peat extraction sites was most affected by land use change. The BD in the top layer at agricultural, peat extraction, and forestry sites was 441%, 140%, and 92% higher, respectively, than that of intact peatlands. Porosity decreased with increased BD, but not linearly. Agricultural and peat extraction sites had the lowest saturated hydraulic conductivity, Sy, and porosity, and the highest BD of the land use options studied. The van Genuchten-Mualem (vGM) soil water retention curve (SWRC) and hydraulic conductivity (K) models proved to be applicable for the peat soils tested, providing values of SWRC, K, and vGM-parameters (α and n) for peat layers (top, middle and bottom) under different land uses. A decrease in peat soil water content of ≥10% reduced the unsaturated K values by two orders of magnitude. This unique data set can be used to improve hydrological modeling in peat-dominated catchments and for fuller integration of peat soils into large-scale hydrological models. fi
dc.language.iso en fi
dc.publisher American Geophysical Union fi
dc.relation.ispartofseries Water Resources Research 57, e2020WR028624 fi
dc.rights CC BY-NC-ND 4.0 fi
dc.subject peatland fi
dc.subject peatlands fi
dc.subject peat soil fi
dc.subject land use fi
dc.subject soil water retention curve fi
dc.subject van Genuchten fi
dc.subject soil properties fi
dc.subject Finland fi
dc.subject Norway fi
dc.subject hydrology fi
dc.subject soil
dc.subject agricultural land
dc.subject bogs
dc.subject agriculture
dc.subject peat production
dc.subject porosity
dc.subject hydraulics
dc.subject soils
dc.subject groundwater
dc.subject forestry
dc.subject peat extraction
dc.title Hydraulic and physical properties of managed and intact peatlands: application of the van Genuchten-Mualem models to peat soils fi
dc.type Article fi
dc.identifier.laitoskoodi Suomen ympäristökeskus fi
dc.subject.ysa suot fi
dc.subject.ysa turvemaat fi
dc.subject.ysa maankäyttö fi
dc.subject.ysa ominaisuudet fi
dc.subject.ysa hydrologia fi
dc.subject.ysa Suomi fi
dc.subject.ysa Norja fi
dc.subject.ysa maaperä
dc.subject.ysa maatalousmaa
dc.subject.ysa maatalous
dc.subject.ysa turvetuotanto
dc.subject.ysa huokoisuus
dc.subject.ysa hydrauliikka
dc.subject.ysa maalajit
dc.subject.ysa pohjavesi
dc.subject.ysa metsätalous
dc.subject.ysa turpeennosto
dc.identifier.doi https://doi.org/10.1029/2020WR028624

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