Dynamic Responses of Non-Structural Carbohydrates in Robinia pseudoacacia Seedlings to NaCl Stress

[Objective] To study the dynamic changes of Robinia pseudoacacia non-structural carbohydrate (NSC) under NaCl stress, to reveal its adaptive mechanism to NaCl stress, and to provide a basis for the management of Robinia pseudoacacia forest. [Method] Taking 1-year-old Robinia pseudoacacia seedlings as the research object, the Pot experiment was conducted to study the relative growth rate, biomass distribution and NSC content of seedlings under different NaCl concentrations (0, 1.5‰, 3‰, 4.5‰). [Results] 1) With the increase of soil NaCl concentration, Robinia pseudoacacia seedlings The relative growth rate of ground diameter and seedling height decreased significantly; with the increase of NaCl stress duration, the growth rate of leaf biomass gradually decreased, while the growth rate of root biomass did not change significantly, resulting in a significant decrease in the ratio of leaf biomass and root biomass. Ratio and root-shoot ratio increased significantly. 2) With the increase of soil NaCl concentration,