Residual Effects of Burnings on Some Soil Chemical Properties in a Pasture in the Central Zagros

Document Type : Research Paper

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Abstract

Among various destruction factors affecting forests and grasslands, especially in arid and semi-arid regions, fire is considered the more dangerous factor and results in different physical, chemical, and biological changes in soil properties depending on the conditions. This study aimed to evaluate the residual effects of previously burned pastures on some soil chemical properties in Fereydan region of central Zagros. Fire in these areas was mainly due to human impacts. The experiment was conducted in a completely randomized design with unequal replicates. Calcium carbonate equivalent and organic matter contents, soluble sodium, potassium, calcium and magnesium, available phosphorus, iron, manganese and zinc were measured by standard methods. The results showed that fire had a significant effect on some of the measured soil chemical properties. Soil organic matter content, soluble potassium, calcium and magnesium, available phosphorus, iron and manganese were increased due to firing. Mean comparisons showed that soil organic matter increased from 2.10% in the unburned to 4.12% in the burned portion of pasture. The soluble potassium, calcium and magnesium increased from 0.45, 6.42, and 1.19 in the unburned to 0.95, 9.91, and 2.22 meq/l in the burned areas, respectively. The available phosphorus, iron, and manganese were increased from 31.30, 18.22, and 37.29 mg/kg in the unburned to 34.17, 20.39, and 55.64 mg/kg soil in the burned soil. The overall impact of burning on soil chemical properties was greater in the first year after the fire, and the effect decreased with time.

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References

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Iranian Journal of Soil Research
Volume 30, Issue 2
August 2016
Pages 227-236

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