Root systems of plants control erosion through architectural characteristics.
"A distinction is usually made between mechanical and hydrological effects of roots without much focus on the influence of architectural characteristics on these effects. Some commonly used architectural characteristics are the spatial distribution of root area ratio for slope stability analysis and root density or root length density for analysis of water erosion control. But many other architectural features, such as the branching pattern, root orientation and fractal characteristics, seem empirically and intuitively related to the effect of root systems on erosion phenomena. Many links between root system architectural characteristics and their soil fixing effects probably do exist and more links could be identified. However, most of these links remain very weak and empirical. The research which is needed to make these relationships explicit is still poorly developed and mainly focused on resistance against uprooting by wind loading. Moreover, although the mechanical and hydrological mechanisms of soil-root interaction are rather well described for simple processes such as sheet, rill or interrill erosion, this knowledge is almost nonexistent for complex processes such as gully erosion. This hampers understanding the importance of root system architecture for these processes." (Reubens et al. 2007:398-399)
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