عنوان مقاله :
Roles of SAR and EC in Gully Erosion Development (A Case Study of Kohgiloye va Boyerahmad Province, Iran)
عنوان فرعي :
نقش هدايت الكتريكي (EC) و نسبت جذب سديم (SAR) در گسترش فرسايش خندقي در مناطق نيمه خشك استان كهگيلويه و بوير احمد
پديد آورندگان :
شهريور، عبدالله نويسنده Center for Agriculture and Natural Resources, Department of Water and Soil, Yasuj, Iran SHAHRIVAR, ABDAL , د بون سونگ، كريستوفر نويسنده Faculty of Agriculture, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia TEH BOON SUNG, CHRISTOPHER , جزوپ، شمس الدين نويسنده Faculty of Agriculture, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia JUSOP, SHAMSUDDIN , عبدالرحيم، انور نويسنده Faculty of Agriculture, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia ABDUL RAHIM, ANUAR , صوفي، مجيد نويسنده Center for Agriculture and Natural Resources, Department of Soil Conservation and Watershed Management, Shiraz, Iran SOUFI, MAJID
كليدواژه :
gully erosion , Sodium absorption ratio (SAR) , Kohgiloye va Boyerahmad Province , electrical conductivity (EC) , Semi-arid area
چكيده فارسي :
ABSTRACT
Gully erosion is a serious problem of land degradation in pasture land of Sothern Iran. To study the causes of gully erosion initiation, the Abgendi Watershed with the highest amount of gully erosion was selected as a semi-arid area in Iran. In this area, 35 gullies were randomly chosen and the influences of SAR and EC, as the indexes of alkalinity and salinity on gully erosion, were investigated. The role of sodium in calculating SAR, and the effective role of sodium to soil dispersing, It can increase the susceptibility of soil to water erosion. Moreover, concentration of soluble salts (are measured by electrical conductivity), such as sodium cations are attached to each soil clay particle in the arid and semi-arid areas. To accomplish this study, soil sampling from head-cut and gully walls in two depths of 0-30 cm (top layer) and 30cm to the bottom of gully (sub-layer) was carried out. One main objective of the present study was to determine the effects of these two chemical factors on gully erosion development. Based on gullies volume (as a dependent variable), the gullies were classified into four groups and were compared in terms of EC and SAR. The results indicated that the gullies with volume of more than 200 m3 (big gully group), in comparison to the gullies with volume less than 50 m3 (very small gully group), have greater EC and SAR. The amounts of EC and SAR of big gully group were significantly higher than very small gully group. Moreover, for the purpose of further analysis, the gullies were classified and compared in terms of EC and SAR. The results indicated that there is a significant difference between gullies volume groups in terms of EC and SAR as well. The gullies with EC > 8 dS/m and SAR > 8, compared to the gullies with
EC < 4 dS/m and SAR < 4, have significantly greater volume and length.
Keywords: Gully erosion, Sodium absorption ratio (SAR), Electrical conductivity (EC), Semi-arid area, Kohgiloye va Boyerahmad Province
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