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Inbar, A., Porter School of Environmental Studies, Tel-Aviv University, Ramat Aviv, Israel, Institute of Soil, Water and Environmental Sciences, The Volcani Center, ARO, P.O. Box 6, Bet-Dagan, Israel
Ben-Hur, M., Institute of Soil, Water and Environmental Sciences, The Volcani Center, ARO, P.O. Box 6, Bet-Dagan, Israel
Sternberg, M., Department of Molecular Biology and Ecology of Plants, The George S. Wise Faculty of Life Sciences Tel-Aviv University, Ramat Aviv, Tel Aviv, Israel
Lado, M., Area of Soil Science, Faculty of Sciences, University of A Coruna, A Zapateira s/n, Coruna, Spain
One of the consequences of wildfires is the modification of the hydrology of the affected area, usually resulting in increased overland flow and soil erosion. In this work, we tested granular anionic polyacrylamide (PAM) to reduce post-fire soil erosion, and the mechanisms by which this polymer modifies infiltration rate (IR), runoff and soil loss. Two contrasting soils affected by fire were exposed to three consecutive simulated rainstorms separated by drying periods. During the 1st rainstorm, PAM decreased IR and increased runoff in both soils while soil loss was reduced compared to the untreated controls. In the following storms, the reduction in soil loss persisted, but the effect of PAM on IR and runoff was reversed. The reduction of soil loss was attributed to two mechanisms: (i) an increase of the viscosities of runoff and soil solution as PAM dissolved during the 1st storm, which resulted in more runoff but with reduced erosivity; and (ii) the stabilization of soil aggregates throughout the 1st rainstorm and drying period, when PAM was irreversibly adsorbed to soil particles. Field erosion plots constructed on a burnt area in Birya forest, Israel, confirmed the laboratory results. The application of 25 and 50kgha-1 of granular PAM reduced soil erosion by 23 and 57%, respectively, compared to the untreated control. We suggest that granular PAM could be an alternative to current post-fire erosion mitigation measures. © 2014 Elsevier B.V.
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Using polyacrylamide to mitigate post-fire soil erosion
239
Inbar, A., Porter School of Environmental Studies, Tel-Aviv University, Ramat Aviv, Israel, Institute of Soil, Water and Environmental Sciences, The Volcani Center, ARO, P.O. Box 6, Bet-Dagan, Israel
Ben-Hur, M., Institute of Soil, Water and Environmental Sciences, The Volcani Center, ARO, P.O. Box 6, Bet-Dagan, Israel
Sternberg, M., Department of Molecular Biology and Ecology of Plants, The George S. Wise Faculty of Life Sciences Tel-Aviv University, Ramat Aviv, Tel Aviv, Israel
Lado, M., Area of Soil Science, Faculty of Sciences, University of A Coruna, A Zapateira s/n, Coruna, Spain
Using polyacrylamide to mitigate post-fire soil erosion
One of the consequences of wildfires is the modification of the hydrology of the affected area, usually resulting in increased overland flow and soil erosion. In this work, we tested granular anionic polyacrylamide (PAM) to reduce post-fire soil erosion, and the mechanisms by which this polymer modifies infiltration rate (IR), runoff and soil loss. Two contrasting soils affected by fire were exposed to three consecutive simulated rainstorms separated by drying periods. During the 1st rainstorm, PAM decreased IR and increased runoff in both soils while soil loss was reduced compared to the untreated controls. In the following storms, the reduction in soil loss persisted, but the effect of PAM on IR and runoff was reversed. The reduction of soil loss was attributed to two mechanisms: (i) an increase of the viscosities of runoff and soil solution as PAM dissolved during the 1st storm, which resulted in more runoff but with reduced erosivity; and (ii) the stabilization of soil aggregates throughout the 1st rainstorm and drying period, when PAM was irreversibly adsorbed to soil particles. Field erosion plots constructed on a burnt area in Birya forest, Israel, confirmed the laboratory results. The application of 25 and 50kgha-1 of granular PAM reduced soil erosion by 23 and 57%, respectively, compared to the untreated control. We suggest that granular PAM could be an alternative to current post-fire erosion mitigation measures. © 2014 Elsevier B.V.
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