The Relationship Between Iron Forms and Some Soil Properties Under Different Vegetation Cover in Duhok Governorate - Northern Iraq
2021
Qahtan Al-Khafagi | Hazim Ahmed
forest soils and agricultural soils, six different sites were chosen from the Dohuk Governorate in northern Iraq. They varied in forest cover and vegetation as follows: Two pedons in the forests of Atrush area, one of which is under the pine trees and the other under oak trees, and two pedons is also in the forests of Zawita area under the pine trees and under the oak trees, pedon in Bateel area for soil that is not exploited for agriculture, and pedon is in the Slifani Plain area for soil cultivated with wheat. The results indicated that the variation in the nature of vegetation cover led to a clear difference and distribution in the values of iron, at different forms the results showed that the total iron content in the soils ranged between (21580 to 35525 mg.kg-1), and the available iron content ranged between (4.96 - 8.85 mg.kg-1), while iron related with organic matter (Fe-O.M) ranged between (28.5 - 148.20 mg.kg-1), and iron related with carbonate (Fe-CaCO3) ranged between (150.4 to 350.8 mg.kg-1), while iron related with free oxides (Fe-Oxides) ranged from Its content ranged between (58.5 to 5206.0 mg.kg-1) in the studied soils, while the residual iron in the soil ranged between (21020.8 - 33470.8 mg.kg-1). The results also showed that available iron has a positive correlation with organic matter and a negative correlation with carbonates in the soil, and a negative correlation between (pH) and different forms (except related carbonate) of iron in the studied soils.
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