In this study, by a field experiment, various biosurfactants were mixed with soil conditioners at consistent proportions and dosages. These mixtures were then applied to sandy land and sandy soil in predetermined amounts to study the effects of different biosurfactants, specifically T1(rhamnolipid) and T2(sophora glycolipid), in combination with soil conditioners on the properties of sandy soil and the growth and development of Leymus chinensis, and investigate feasibility of biosurfactants combined with soil conditioners. The result showed that compared to CK, for the treatments of T1 and T2, the moisture content decreased by 27.7% and 20.9%, respectively; while bulk density reduced by 5.9% and 2.9%, respectively; pH decreased by 2.3% and 1.8%, respectively; organic matter content increased significantly by 91.1% and 39.8%, respectively; available phosphorus content rose dramatically by 221.1% and 90.2%, respectively; available potassium content increased by 16.7% and 41.7%, respectively; alkali hydrolyzed nitrogen showed increases of 233.2% and 122.1%, respectively; plant height improved by 53.8% and 46.3%, respectively; biomass exhibited substantial increases of 360.3% and 296.9%, respectively; chlorophyll content increased by 17.0% and 14.3%, respectively. The principal component analysis showed that the comprehensive scores of CK, T1, T2 treatment were -2.99, 2.24, 0.74, and the order was T1>T2>CK, and the comprehensive score of treatment T1 was the highest. In conclusion, the combination of biosurfactants with soil conditioners effectively enhanced both physical and chemical properties within sandy soils while promoting growth of Leymus chinensis, with rhamnolipid combined with a soil conditioner demonstrating the best comprehensive improvement effects.
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