三种植物基固沙剂对风沙土水分入渗和蒸发的影响

Plant-based sand-fixing agents are environmentally friendly agents made primarily from plant components. They can effectively stabilize sand without polluting the soil, and their decomposition products promote plant growth. To investigate the physical characteristics of consolidated layers formed by plant-based sand-fixing agents and their effects on soil water movement in sandy farmland, this study conducted water infiltration and evaporation simulation experiments on three types of plant-based sand-fixing agents (Artemisia sphaerocephala, flax, and black locust) and six application rates (0.5 gm-2, 1.0 gm-2, 2.0 gm-2, 3.0 gm-2, 4.0 gm-2, 5.0 gm-2), using wind-sand soil sprayed with the same amount of pure water as the control (CK). The results showed that: (1)The application of plant-based sand-fixing agents altered soil physical properties. The compressive strength of the consolidated layer was in the order of black locust > flax > Artemisia sphaerocephala > CK. The average compressive strength of the consolidated layer treated with the three agents increased by 109.38%, 95.06%, and 58.46% compared to CK, respectively. The compressive strength of the same agent increased with its concentration. Soil bulk density increased with higher application rates, with a maximum increase of 3.76% compared to CK. Meanwhile, total porosity, saturated water-holding capacity, and minimum water-holding capacity decreased, with maximum reductions of 44.55%, 47.65%, and 53.62% compared to CK, respectively.2The application of plant-based sand-fixing agents effectively reduced the water infiltration rate. The infiltration times were as follows: flax (29.53 min) black locust (29.52 min) > Artemisia sphaerocephala (29.03 min) > CK (26.08 min). As the application rate increased, the infiltration time showed a U-shaped trend for black locust and flax agents, while Artemisia sphaerocephala exhibited a gradual increase.3Plant-based sand-fixing agents significantly reduced soil water evaporation rates. For all three agents, the application rates of 2.04.0gm-2 demonstrated the most pronounced effects.4When the application rate was 2.04.0 gm-2, both water retention effectiveness and prevention of excessively slow water infiltration were achieved. This study provides theoretical support for the exploration of new sand-fixing agents and their application in wind erosion prevention on sandy farmland soils.