Spatial variability of soil nutrients and salinity in coastal saline-alkali land based on belt transect method. Saline-alkali land management and countermeasures of sustainable agricultural development in Songnen Plain Characteristics of ‘salt island’ and ‘fertile island’ for Tamarix chinensis and soil carbon, nitrogen and phosphorus ecological stoichiometry in saline-alkali land. Characteristics of arbuscular mycorrhizal fungal diversity and functions in salinealkali land. Dynamics of salinization land based on EVI series data and landscape pattern analysis in Songnen Plain: A case study in Da’an City. A research on Ephedra cultivation in saline-alkali land