Effect of Simulation Platform Fields' Lasting Improvement of Coastal Saline-Alkali Land

To study the characteristics of soil salt content and the law of desalting rate at the different uplift heights and uplift times and to provide theoretical basis for the engineering measures to improve saline-alkali land, this paper constructs simulation platforms with the artificial river banks on coastal saline-alkali land in Circum-Bohai Sea Region. The results indicate a significant correlation between the platform height and the soil desalting. On the bank of the river excavated 500 years ago, the platform has been uplifted by 0.5∼1.7 m. The soil desalting rate of 1 m soil mass reaches 48.6∼93% and the soil desalting effect is more and more significant with the increase of the height of the platform field. When the height reaches 0.84 m, the surface soil salinity reduces from 2.75∼2.9 k/kg to 1 k/kg. On the bank of the river excavated 50 years ago, the platform has also been uplifted by 0.5∼1.7 m. The soil desalting rate of 1 m soil mass reaches 12.8∼82.6% and the soil desalting effect is more and more significant with the increase of the height of the platform field. When the height reached 1.26 m, the surface soil salinity reduces from 2.94∼4.15 k/kg to 1 k/kg. Hence, the authors draw the conclusion that the saline-alkali land on lower platform fields can be fully treated with prolonged treatment time, and the higher the platform field, the faster the saline-alkali soil desalting rate.