Soil characteristics of medlar wood growing on secondary salinization land in Jingdian irrigation zone Effect of applying peat to soda salinized soil on soil salinity in north plain of Liaohe River AFFORESTATlON TECHNIQUE ANDA MELIORATION OF LIAONING COASTAL SALIN-ALKALINE SOIL Anatomy structures study of Portulaca oleracea Research on the types and exploitation models of saline soil in Da‘an Ancient Riverway Effects of soil rhizosphere microbial community and soil factors on arbuscular mycorrhizal fungi in different salinized soils