Influence of different land-cover types on the changes of selected soil properties in the mountain region of Rawalakot Azad Jammu and Kashmir |
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Authors: | M Kaleem Abbasi Mohsan Zafar Sumyya Razaq Khan |
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Affiliation: | (1) Department of Soil and Environmental Sciences, Faculty of Agriculture, University of Azad Jammu and Kashmir, Rawalakot, Azad Jammu and Kashmir, Pakistan |
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Abstract: | The study focused on the impact of change in land-cover types on soil quality inferred by measuring the relative changes in
chemical and physical properties of non-disturbed and disturbed soil system. Soil samples were collected from major land-cover
types in the mountain region: natural forest, grassland and cultivated land (arable). The natural forest served as a control
against which to assess changes in soil properties resulting from the removal of natural vegetation or cultivation of soil.
Soil samples were collected from 0–15 and 15–30 cm depth six times during the year and examined for their nutrient status,
i.e. soil organic matter (SOM); total N (TN); available P (AP); available K (AK); cation exchange capacity (CEC), pH and physical
properties like particle size distribution, bulk density (BD), and porosity. Significant differences among land-cover types
were found for SOM, TN, AP; AK, CEC and pH. Soil collected from the forest had the highest levels of all nutrients followed
by grassland while soil from the arable site had very low nutrient status indicated an extractive effect of cultivation and
agricultural practices on soil. With significantly lower clay contents (20%), texturally the soil of arable site was quite
different from that of the natural forest and grassland. Similarly, a 13% more BD and 12% lower porosity showed structural
deterioration of arable soil. The changes in clay contents, BD and porosity due to cultivation suggest adverse effects on
environmental protection functions of soil. The correlation coefficient between OM to TN, AP, AK and CEC suggesting that within
a narrow range of soil, OM may serves as a suitable indicator of soil quality. Natural vegetation appeared to be a main contributor
of soil quality as it maintained the organic carbon stock and increased the nutrient status of soil and is therefore, important
to sustain high-altitude ecosystems and reinstate the degraded lands in the mountain region. |
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Keywords: | Deforestation Degradation Natural vegetation Soil erosion Soil properties Soil quality |
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