Abstract: This study was designed to compare the biological, chemical and physical remedies on saline-alkali grassland.Three kinds of forage grass, Aneurolepidium chinense, Hordeum brevisubulatum and Puccinellia tenuiflora were planted in experimental sites, and soil was ameliorated with grass litter, gypsum amendment and sand bedding, respectively.The result showed that all of the three ways decreased soil pHand electrical conductivity, and increased soil water content.In biological treatment.Aneurolepidium chinense and Hordeum brevisubulatum could grow well with 1.5kg·m^-2 of litter, and Puccinellia tenuiflora with 1.0kg·m^-2 of litter.Applying 1.25kg·m^-2 of gypsum could produce an efficient effect.A.chinense and H.brevisubulatum could normally grow with 13cm thickness of sand bedding, and P.tenuiflora with 11cm.

Key words: Saline-alkali soil, Improvement, Litter, Gypsum, Sandy soil, ecosystem service flow, spatial and temporal scale, distributed ecosystem model, abiotic flow, big data