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Effect of fire on some physico-chemical and micromorphological properties of forest soils in Guilan province

Effect of fire on some physico-chemical and micromorphological properties of forest soils in Guilan province

Mehdi Norouzi ([email protected])
Department of Soil Science, University of Guilan
June, 2011
 
Mehdi Norouzi is currently a first year PhD student working under supervision of professor Jafarzadeh in university of Tabriz.
 

Abstract

Many physical, chemical, mineralogical, biological and micromorphological soil properties can be affected by forest fires.This effects are chiefly a result of burn severity (consists of peak temperatures and duration of the fire). The objective of this study was to investigate the effect of the forest fire on physical and chemical and micromorphological soil properties one month after the fire. For this purpose three site (Pilimbra, Lakan and Saravan) from pinus taeda community were chosen and soil samples from three depths (0-3, 3-6 and 6-9 cm) under the forest floor in burned and unburned soils were collected. Results of this study indicated that clay content, porosity, aggregate stability, organic matter, nitrogen and CEC values significantly decreased in burned soils. In addition, sand content, bulk density, aggregate density. pH, EC, available-P, soluble cations (except Na), exchangeable K, base saturation and ESP values significantly increased in burned soils. Burning also had significant decrease in iron extracted by DTPA and sodium pyrophosphate. Results of WDPT test showed the water repellency on the depth of 0-3 cm in burned soils, and water repellency did not observe in unburned soils. Probably, this state created by heat and transformation in organic matter. Micromorphological observations of surface soil showd only few charcoal particles and burned fungal component in thin sections. Results of image analysis of soil pores in thin sections, showed the number of voids, percent of total voids, elongated voids (with circularity of 0.0-0.2) and fractal dimension of the pore component (Dmp) significantly decreased in burned soil and voids with equivalent pore diameter 10-50 µm, regular voids (with circularity of 0.5-1.0) and Fractal dimension of the solid component (Dms) significantly increased. Generally, the results of this study showed fire effects on chemical, physical and micromorphological soil properties were confined mainly to the surface soil.