Marschner Review

Plant and Soil

, Volume 377, Issue 1, pp 1-23

First online:

Ecological mitigation of hillslope instability: ten key issues facing researchers and practitioners

  • Alexia StokesAffiliated withINRA, UMR AMAP Email author 
  • , Grant B. DouglasAffiliated withAgResearch
  • , Thierry FourcaudAffiliated withCIRAD, UMR AMAP
  • , Filippo GiadrossichAffiliated withUniversity of Sassari
  • , Clayton GilliesAffiliated withFPInnovations
  • , Thomas HubbleAffiliated withSchool of Geosciences, The University of Sydney
  • , John H. KimAffiliated withINRA, UMR AMAP
  • , Kenneth W. LoadesAffiliated withThe James Hutton Institute
  • , Zhun MaoAffiliated withIrstea, UR EMGR
    • , Ian R. McIvorAffiliated withPlant & Food Research
    • , Slobodan B. MickovskiAffiliated withSchool of Engineering and Built Environment, Glasgow Caledonian University
    • , Stephen MitchellAffiliated withFaculty of Forestry, University of British Columbia
    • , Normaniza OsmanAffiliated withInstitute of Biological Sciences, Faculty of Science, University of Malaya
    • , Chris PhillipsAffiliated withLandcare Research
    • , Jean PoesenAffiliated withDepartment of Earth and Environmental Sciences, KU Leuven
    • , Dave PolsterAffiliated withPolster Environmental Services
    • , Federico PretiAffiliated withEngineering for Agro-Forestry and Biosystems Division, Università Firenze - GESAAF
    • , Pierre RaymondAffiliated withTerra Erosion Control Ltd
    • , Freddy ReyAffiliated withIrstea, UR EMGR
    • , Massimiliano SchwarzAffiliated withBern University of Applied Sciences
    • , Lawrence R. WalkerAffiliated withSchool of Life Sciences, University of Nevada Las Vegas



Plants alter their environment in a number of ways. With correct management, plant communities can positively impact soil degradation processes such as surface erosion and shallow landslides. However, there are major gaps in our understanding of physical and ecological processes on hillslopes, and the application of research to restoration and engineering projects.


To identify the key issues of concern to researchers and practitioners involved in designing and implementing projects to mitigate hillslope instability, we organized a discussion during the Third International Conference on Soil Bio- and Eco-Engineering: The Use of Vegetation to Improve Slope Stability, Vancouver, Canada, July 2012. The facilitators asked delegates to answer three questions: (i) what do practitioners need from science? (ii) what are some of the key knowledge gaps? (iii) what ideas do you have for future collaborative research projects between practitioners and researchers? From this discussion, ten key issues were identified, considered as the kernel of future studies concerning the impact of vegetation on slope stability and erosion processes. Each issue is described and a discussion at the end of this paper addresses how we can augment the use of ecological engineering techniques for mitigating slope instability.


We show that through fundamental and applied research in related fields (e.g., soil formation and biogeochemistry, hydrology and microbial ecology), reliable data can be obtained for use by practitioners seeking adapted solutions for a given site. Through fieldwork, accessible databases, modelling and collaborative projects, awareness and acceptance of the use of plant material in slope restoration projects should increase significantly, particularly in the civil and geotechnical communities.


Erosion Hydrology Landslides Dike (levee) Soil bioengineering Vegetation