In order to study the effect of different land use of saline-alkali soil on the soil salinization characteristics

the field investigation

sampling and indoor analysis were conducted. The morphological characteristics

soluble salt content

composition of salt ions

total alkalinity

pH

alkalinity and other indicators of soil profile were studied in six soil depths under five land use

namely

forest land

agricultural land

grassland

improved land and salt wasteland in Hetao plain. The results showed that there were significant differences in soil structure

color

root distribution

lime reaction and alkalinization of soil in different land use systems. The distribution of soluble salt and anion in soil profile was different due to different land use. Among them

grassland and forest land

were "olive"

salt wasteland and improved land were "surface accumulation"

and agricultural land was "bottom accumulation". The distribution characteristics of soil pH

alkalinity and total alkalinity in the profile were basically the same

showing an "S" pattern. The salinization degree and alkalinization degree of soil decreased with the different land use of saline-alkali soil

among which agricultural land was the most obvious. The total salinity

total pH alkalinity and ESP values of 0—20 cm soil decreased to 0.88 g/kg

7.83

0.17 cmol/kg and 12.54%

respectively

indicating that soda-saline and alkaline land was more conducive to soil desalination and dealkalization after agricultural use. Soil total salinity

Ca2+

Mg2+

SO42-

total alkalinity and pH were the main factors of salinization in the studied area. These research results could provide technical reference for clarifying the salinization process and the improvement of salinized soil in Hetao plain.