Soil Salinity and Alkalinity Map Preparation Based on Spatial Analysis of GIS Case Study: Tabriz PlainReport as inadecuate




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Bettermanagement of agricultural fields is related to valuable information which canderived from soil salinity and alkalinity maps. These maps are considered asone of the most important factors which restrict plant growth as well asdecline crops yield. The objective of this research was preparing of soilsalinity and alkalinity maps in Tabriz plain over 50,000 hectares based ondifferent techniques of spatial analysis in GIS software. For this mean, studyarea was divided in 1500 × 1500 m2 gridcells. Then, geographical coordinate of each grid recorded in UTM system. So,they were transferred into GPS for navigating to the exact excavation location. After soilsampling and transferring to the lab, their EC and PH were measured insaturation extract of soil samples. So, spatial distribution of soil samplingpoints was prepared in form of point map by GIS software. Generalization ofpoint information to surface was performed using different interpolationalgorithms and based on standards of Soil and Water Research Institute.Accuracy of interpolated maps was evaluated due to the MAE and MBE values. Theresults showed that the lowest observed error is related to the Spline methodand therefore, thismethod was used for spatial modeling of salinity and alkalinity maps in theintended area. The research findings demonstrated that from total of 50,000hectares, only 3066 hectares were without salinity and alkalinity limitation 6.1%, 9066 hectares had lowsalinity and alkalinity 18.1%; 17,772 hectares had average limitation for salinity and alkalinity 35.6%and the remaining 20,096hectares had high and very high limitation for salinity and alkalinity.

KEYWORDS

GIS, Interpolation Techniques, Salinity and Alkalinity Map, Tabriz Plain

Cite this paper

Farajnia, A. and Yarahmadi, J. 2017 Soil Salinity and Alkalinity Map Preparation Based on Spatial Analysis of GIS Case Study: Tabriz Plain. Open Journal of Geology, 7, 778-788. doi: 10.4236-ojg.2017.76052.





Author: A. Farajnia1, J. Yarahmadi2

Source: http://www.scirp.org/



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