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    Changes in soil quality parameters after a wildfire in Gelibolu (Gallipoli) National Park, Turkey
    (Parlar Scientific Publications (P S P), 2005) Ekinci, H; Kavdir, Y
    The objective of this study was to determine the influence of forest wildfires that occurred 1994 in Gelibolu (Gallipoli) National Park, Turkey, on some physical, chemical and biological properties of soils. Soil samples were collected from five different locations as replicates from both burned and nearby unburned sites. Results showed that available phosphorus and potassium content, pH, and electrical conductivity of burned soils were higher than those of unburned counterparts. On the other hand, aggregate stability, hydraulic conductivity, total porosity, soil water content, cation exchange capacity, total nitrogen, urease activity, and microbial biomass carbon values of burned soils were lower than those of unburned ones. The mean soil organic carbon values were 2.94% for burned and 5.01% for unburned soils, whereas those of microbial biomass were 1.2 mg C g soil(-1) and 1.69 mg C g soil(-1). Aggregate stability values were found to be 88.32% and 94.44% (P < 0.05), and urease activities were 185 mg kg(-1) 2-h(-1) and 366 mg kg(-1) 2-h(-1) (P < 0.01) for burned and unburned soils samples, respectively. This research showed that negative effects of fire still remain in the soil even after 8 years and recovery of soil health was very low.
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    Öğe
    Soil aggregate stability and 13C CP/MAS-NMR assessment of organic matter in soils influenced by forest wildfires in Canakkale, Turkey
    (Elsevier, 2005) Kavdir, Y; Ekinci, H; Yüksel, O; Mermut, AR
    The impact of forest fire on soil quality is not well appreciated. This study investigated the influences of forest wild fires that occurred 12, 8, 2 years and 2 weeks before the time of sampling on the composition of the forest floor organic matter by comparing total carbon (C) and total nitrogen (TN), composition of organic functional groups as determined by C-13 CP/MAS-NMR and soil aggregate stability of unburned and burned forest floor in Canakkale, Turkey. Fire altered soil organic matter composition and reduced organic C content of surface (0-5 cm) soil. The C-13 CP/MAS-NMR analyses confirmed that the forest soils exposed to fires 12, 10 and 2 years before the time of sampling had higher potential for humification than unburned control soils. However, soils exposed to the fire 2 weeks before the time of sampling became more humified than unburned control soils. Carbohydrate contents of the recently burned soils were distinctly lower than those of the control soils. This is expected, as burning would reduce fresh litter which contains labile and easily decomposable materials. There was 20% decrease in 1990, 52% in 1994, 43% in 2000 and 11% in 2002 of soil organic carbon values of burned soils, compared to unburned forest floor. Fire also reduced the stability of soil aggregates by 1-16%. It was found that carbohydrate content of soil organic matter was directly related (r(2)=0.92) to the stability of soil aggregates but not to the total amount of organic matter. The very high correlation coefficient suggests that carbohydrate C functional group plays an important role in the stabilization of soil aggregates. (c) 2005 Elsevier B.V. All rights reserved.