Spatial variability and mapping of some soil physico-chemical properties in surface soils and influence of land use management on them in agricultural lands of Southern Tehran

Hossein Torabi Golsefidi | N. Davatgar | Shokoh Qassemi

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=42244
Date :  2016/08/22
Publish in :    پژوهش هاي خاک - علوم خاک و اب سابق

Link :  http://srjournal.areo.ir/?_action=current&_is
Keywords :Spatial, mapping, soils

Abstract :

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Development of residential, commercial, industrial areas and agricultural land use in South of Tehran, have caused changes in some physical and chemical properties in the soil environment. In this research, 196 soil samples were collected at depth of 0-30cm, at 1000×1000m grids in 20000ha agricultural lands of Southern Tehran. Soil texture, pH, calcium carbonate, cation exchange capacity, and organic carbon were measured. Geostatic analysis, interpolation of soil properties by kriging and mapping were carried out by GS+ and ArcGIS software. Results showed that 26.3, 54.6 of lands were containing of less than 0.9 and 0.9 to 1.2 of organic carbon respectively. A land containing less than 0.9 of organic carbon is often cultivated crops, residential areas and barren lands. The land contains of 0.9-2.2 organic carbon is often cultivated vegetables crops. Except the 29.9 of which lands affected by industrial waste water with a pH greater than 8, the remaining of lands have a pH 7.5 to 8. About 81 of the lands have 5 to 15 lime and 78.6 of the lands have a CEC 20-35 cmolckg-1. In this study, spherical model were fitted for organic carbon, pH, CEC and lime. Exponential model were fitted for clay and silt and Gaussian model for sand. Using wastewater, intensive agriculture and specific management especially for cultivation of vegetable crops were significant effects on soil properties. Key Words: pH, Soil texture, Kriging, Organic carbon, Calcium carbonate.