Research on salt tolerance and salt restraint of Astragalus membranaceus at different cultivating ages

The salt ions in the soil that cultivated with Astragalus membranaceus of different cultivating ages were determined,and then the improvement effects of Astragalus membranaceus on saline land were discussed.The result showed that Astragalus membranaceus had significant improvement effects on saline land.After planting Astragalus membranaceus,Na+,Ca2+,Mg2+,SO2-4 and Cl-concerntrations in 0～80 cm soil layers,as well as pH value,obviously decreased,and the K+/Na+ increased,thus the saline land had been improved.Salt tolerance experiment result showed that harmful ions Cl-and Na+ were mostly gathered in root and stems of two-year-old Astragalus membranaceus,among which Na+ was mainly gathered in leaves of one-year-old Astragalus membranaceus,and Cl-was maily existed in root and stems of both two-year-old and one-year-old Astragalus membranaceus;membrane penetrate and proline content of Astragalus membranaceus cultivated in saline land were both higher than those in normal soil.