Influence of Polyacrylamide (PAM) on the Soil and Water Conservation Effects of White Clover (Trifolium repens L)

Abstract

In order to explore the technology of soil and water conservation in coastal saline soil area, improve the prevention and control of soil erosion, white clover (Trifolium repens L) combined with different dosage of polyacrylamide (PAM) was applied to the soil and water conservation in plot tests, and the influence of PAM on the soil and water conservation effects of white clover (Trifolium repens L) was examined. The resultsshowed that compared to the only planting white clover, the addition of 1-5 g/m2 PAM reduced soil erosion by516.0-1326.3 t/(km2·a), which were 29.5-75.8% of the yearly soil erosion; inhibited soil evapotranspiration by 24.3-43.4%; improved the total rain water interception by 18.0-44.1 mm; and decreased the cumulative percentage of water loss (CP) by 0.4-4.7% in the 30th day after the plants harvest. From the aspects of reduction efficiency of erosion modulus and reduction efficiency of evapotranspiration, the optimistic dosage ofPAM was 1 g/m2. The synergy of PAM mainly focus on the early stage of white clover. In addition, PAM maystill slightly prevent the water loss after the plants harvest.