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Abstract Based on moisture balance of bio-slope-engineering system，the fundamental requirements of water storage capacity of root layer soil in rock slope protection are put forward. By field rainfall tests，the regulations of moisture migration in bio-slope-engineering system for rock slope are studied. Then，the factors governing moisture balance of bio-slope-engineering system are analyzed，such as initial water storage capacity of root layer soil，vegetation interception，slope surface runoff，slope angle，slope surface evapotranspiration，and wilting capacity of root layer soil. It is shown that carrying soil can obtain larger water storage capacity in a relatively short time if its ratio is reasonable and its permeability is good，and adding a good amount of water retention agents and peats into carrying soil can significantly reduce water evapotranspiration；furthermore，water retention agent can reduce wilting capacity of carrying soil，thus more moisture in carrying soil becomes available for plants. It is also shown that vegetation interception cannot be ignored in a good vegetation-covered slope，and slope angle should be appropriately determined to improve the rainfall infiltration. The results may be helpful for moisture balance and bio-slope-engineering system control for rock slope.
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Received: 02 May 2013
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2013, Vol. 32 
