SPATIAL VARIABILITY OF SOIL TOTAL SALT, PH AND TOTALALKALINITY

Soil samples were taken from 3 layers of each of the profiles distributed in a pattern of 15m×15m grid over a newly-reclaimed field, and used to determine space variability of total salt, pH and total alkalinity from layer to layer. The results indicate that the total salt content of the research area is generally low, salt accumulation at the surface soil layer is not significant; Soil pH and the total alkalinity is high, generally enough to meet the criteria of soil alkalization; The variation between soil layers in total salt and total alkalinity is moderate, and rather minor in pH; Characteristics of the spatial variation of salt, pH and total alkalinity somewhat differ between the three soil layers, with structural factors playing a leading role. The isoline maps of soil salt content, pH and total alkalinity are obtained with Kriging's interpolation method, and can be used as the basis for amelioration of saline-alkali soils.