Modelling effects of root growth and decay on soil water retention and permeability

DOI Web Site Web Site 被引用文献2件
  • J.J. Ni
    Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR.
  • A.K. Leung
    Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong S.A.R.; formerly Division of Civil Engineering, School of Science and Engineering, University of Dundee, Dundee, Scotland, UK.
  • C.W.W. Ng
    The Hong Kong University of Science and Technology, Hong Kong S.A.R.

書誌事項

公開日
2019-07
権利情報
  • http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining
DOI
  • 10.1139/cgj-2018-0402
公開者
Canadian Science Publishing

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説明

<jats:p> Plant roots can change the soil water retention curve (SWRC) and saturated permeability (k<jats:sub>sat</jats:sub>) of vegetated soils. However, there is no model that could capture both the effects of root growth and root decay on these soil hydraulic properties simultaneously. This note proposes a new void ratio function that can model the decrease and increase in soil void ratio due to root occupancy (upon growth) and root shrinkage (upon decay), respectively, in an unsaturated vegetated coarse-grained soil. The function requires two root parameters; namely, root volume ratio and root decay ratio, both of which can be readily measured through root excavation and image-based analysis. The new function is incorporated into a void ratio–dependent SWRC model for predicting the SWRC of vegetated soils. Similarly, the same function can be combined with the Kozeny–Carman equation for predicting k<jats:sub>sat</jats:sub>. The model prediction is then compared with a set of new field test data and an existing laboratory dataset for a silty sand vegetated with plant species under the family Schefflera. Good agreements are obtained between the measurements and predictions. </jats:p>

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