Journal of Food, Agriculture and Environment
Vol 8,
Issue 3&4,2010
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Iron oxide forms and distribution in a transect of Dasht-e-Tabriz soils, northwest Iran
Author(s):
Parisa Alamdari 1*,
Ali Asghar Jafarzadeh 1, Shahin Oustan 1, Norier Toomanian 2Recieved Date: 2010-06-07, Accepted Date: 2010-10-30
Abstract:In present study various forms of iron were investigated in three physiographic units of hill, piedmont and river alluvial plain in one transect of Dasht-e-Tabriz to assess the effects of pedogenic processes. Seven pedons were selected, sampled and analyzed for soil physiochemical properties and different forms of iron (Fe); Fed, citrate-bicarbonate-dithionate extractable Fe; Feo, acid oxalate-extractable and Fep, Na-pyrophosphate-extractable Fe. According to obtained results, there is some variation of iron oxides concentration which might be related to the rate of weathering, moisture content and pedogenic accumulations. A wide relative variation in mean value of Fed (5.13 – 9.35g kg-1), Feo (2.62 – 4.52g kg-1) and Fep (0.18 – 1.72g kg-1) was observed among physiographic units. Piedmont plain with aridic moisture regime had lowest amount of Fed and highest Feo/ Fed ratio. The Fed values are higher than Feo values in all soils, indicating that a considerable fraction is present in crystalline form. Fed accumulates in B horizons and it is higher in mollisols than other soil orders but Feo has reducing pattern in profiles and it is high in profiles with limited in drainage. Based on linear coefficient of correlation, Fep has significant positive correlation with OC.
Keywords:Fed,
Feo, Fep, pedogenic accumulations, physiographic unitsJournal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 3&4
Category: Environment
Pages: 976-979
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