Yang, L.-x., Li, S.-c., Sun, H.-l., Ye, F.-f., Liu, W. and Luo, S. 2011. Polyacrylamide molecular formulation effects on erosion control of disturbed soil on steep rocky slopes. Can. J. Soil Sci. 91: 917-924. Soil erosion caused by increasing runoff and soil disturbances is a severe problem on steep rocky slopes. One possible soil erosion control measure is the application of polyacrylamide (PAM). Little is known about PAM application in the ecological recovery field, especially for steep rocky slopes. Our objective was to examine the ability of a range of anionic PAMs to control soil erosion on steep rocky slopes. Nine types of anionic PAMs were studied, which consisted of three molecular weights (MW) and three charge densities (CD) in a factorial design. The study was conducted using laboratory soil trays exposed to simulated rainfall. Three soils of different textures were treated with PAM using hydro-seeding technology with soil trays at a 60° slope. This work demonstrates that PAMs are effective at improving infiltration, thereby decreasing soil erosion. The PAMs that performed best for erosion control were the 14 Mg mol-1 MW and 30% CD for the loamy sand, the 10 Mg mol-1 MW and 20% CD for the silty loam, and the 6 Mg mol-1 MW and 30% CD for the silty clay. These results could assist ecologists in developing PAM application strategies to promote slope recovery.
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