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Effect of Root Density on Erosion and Erodibility of a Loamy Soil Under Simulated Rain

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Authors:
  • Katuwal, Sheela ;
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    Institut for Agroøkologi - Jordfysik og Hydropedologi
  • Vermang, Jan ;
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    Ghent University
  • Cornelis, Wim M. ;
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    Ghent University
  • Gabriels, Donald ;
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    Ghent University
  • Møldrup, Per ;
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    Orcid logo0000-0003-1619-1457
    The Faculty of Engineering and Science (ENG), Aalborg University
  • de Jonge, Lis Wollesen
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    Institut for Agroøkologi - Jordfysik og Hydropedologi
DOI:
10.1097/SS.0b013e318285b052
Abstract:
Though both above- and belowground components of vegetation act together in reducing soil erosion, mainly the aboveground component has received attention in past research. Therefore, the aim of this research was to evaluate the contribution of roots in soil erosion control. Perennial ryegrass (Lolium perenne L. Hugo) was grown in soil pans and laboratory rainfall simulation experiments were conducted after 4, 8, 12 weeks of their growth with seeding density of 50 kg ha-1, after 4 weeks for seeding density of 100 kg ha-1 and on a control. The experiments with ryegrass were done (1) in presence of complete plants and (2) after clipping off the shoots. Roots of ryegrass grew rapidly, attaining densities of 0.614 kg m−2 and 2.280 kg m−2 in 4 and 12 weeks respectively. There was no significant influence of root density alone in runoff whereas presence of shoots decreased runoff over control. With increasing root density, splash erosion decreased linearly and wash decreased exponentially. There was 67% reduction in total soil loss in 12 weeks as compared to control, mainly due to increase in soil’s shear strength and aggregate stability with roots. No influence of roots on bulk density and saturated hydraulic conductivity was observed.
Type:
Journal article
Language:
English
Published in:
Soil Science, 2013, Vol 178, Issue 1, p. 29-36
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2013
Scientific Level:
Scientific
ID:
247289650

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