Abbreviations : L. chinensis, Leymus chinensis ; DASLES, Da‘an Sodic Land Experiment Station; CAS, Chinese Academy of Sciences; MSSL, moderately saline-sodic grassland; SSSL, severely saline-sodic grassland; N, nitrogen; EC, electrical conductivity; ESP, exchangeable sodium percentage; SOM, soil organic matter; TN, total nitrogen, AN, available nitrogen; C/N, the ratio of carbon to nitrogen; RDA, Redundancy analysis; EMF, ecosystem multifunctionality.