4. RESULTS AND DISCUSSIONS
4.1 Salinity Model
The model of salinization in the Northeast consists of 4 factor layers:
Salinity = geology + ground water quality and yield + Landform + Land cover
The high salinity potential were found on the areas underlain by the Maha Sarakham Formation and low water
quality and high yield. The low lying topography and poor vegetation cover
greatly enhanced the salinization. The area occupies by each class of the salinity
are shown in table 3. The high and moderate soil salinity classes cover
approximately 0.66% and 9.81% of the total area respectively. The non and low
salinity potential classes together accounted for over 89% of the total area. It is
evident that the areas highly vulnerable to salinization greatly related to the
ground water quality and yield that normally occurred on the Maha Sarahkam
Formation. The combination of factor conditions for the soil salinity potential
class is assigned in table 2. The salinity potentials where the specified condition as
identified in the table 2 occurs together in the same area were categorized
accordingly. The spatial distribution of the soil salinity potential in the Northeast
was identified in figure 3.