تلخیص
Present study was conducted during the year 2006-2007 to assess the effect of past soil erosion on selected properties of some eroded soil series of River Swat Catchment area. Six soil series including, slightly eroded (Pirsabak), moderately eroded (Missa, Makhnial, and Chapri) and severely eroded (Missa Gullied and Gullibagh) were selected. Soil samples were collected from surface, sub-surface and sub-strata and were analyzed for various physico-chemical properties. It was observed that sand content increased, while silt and clay content decreased with the increasing level of erosion. Bulk density increased significantly, while total porosity, saturation percentage and organic matter decreased significantly with the severity of erosion and from top soil to sub-soil. Variation in pH was non significant, but generally pH and EC of severely eroded soil series increased from top soil to sub-soil. Lime content increased significantly (P < 0.01) with the severity of erosion. Organic matter and available P decreased significantly in surface, sub-surface and sub-strata. Consequently 98% soils were deficient in P. Available K decreased with the severity of erosion and from top soil to sub-soil and the K content of severely eroded series (Gullibagh) was the lowest. However, K deficiency was less as only 6 % soils were deficient in K. Similarly, Fe, Cu, Mn and Zn showed decreasing trend with the severity of erosion and from surface to sub-strata. As regards micronutrients deficiency, iron (Fe) was deficient in 54% and zinc (Zn) was deficient in 80% samples and none of the soils was deficient in copper (Cu). The extent of deficiency was in the order of P>Zn>Fe> K>Mn
F. Khan*, J. Ahmad, , M. Sharif , M. Tariq. (2008) Characterization of some eroded soil series of River Swat Catchment area , The Journal Soil & Environment , Volume 27, Issue 2.
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