Effects of NaCl stress on pH values and nutrient elements around rhizosphere of young grapevines

The changes in pH values and primary nutrient elements around rhizosphere soil and non-rhizosphere soil of Cabernet Sauvingon young grapevines under salt stress were studied by using rhizobox cultivation experiment. The results showed that pH values of rhizosphere soil were lower than non-rhizosphere soil under different salt stresses, pH values of each layer increased with salt stress. Water-soluble potassium ions were lost, but water-soluble sodium ions and calcium ions were enriched. Alkai-hydrolyzable nitrogen was enriched without salt stress, but was lost under salt stress. Available phosphorus was lost when stressed in 4 g/kg salt, and enriched under other treatments. Water-soluble magnesium ion was enriched when stressed in 4 g/kg salt, and lost under other treatments. The results indicated that sodium ion blocked the root system from absorbing and utilizing the mineral nutrients, affected normal physiological activities of young grapevines, and restricted root activity and absorption ability of young grapevines. With the effect of sodium ion, the transfer and absorption of potassium ion, calcium ion and magnesium ion were affected to different extents. Compared with CK, the content of these ions changed in each layer.