Volume 6, Issue 4 (winter 2003)
jwss 2003, 6(4): 103-115 |
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A. Ahmadi Iikhchi, M. A. Hajabbassi, A. Jalalian. Effects of Converting Range to Dry-farming Land on Runoff and Soil Loss and Quality in Dorahan, Chaharmahal & Bakhtiari Province. jwss 2003; 6 (4) :103-115
URL: http://jstnar.iut.ac.ir/article-1-140-en.html
URL: http://jstnar.iut.ac.ir/article-1-140-en.html
Abstract: (32564 Views)
Cultivating rangeland to be shifted to crop land farms commonly causes soil degradation and runoff generation. This study was conducted to evaluate the cultivation effects on runoff generation and soil quality. The experiment was performed in a rangeland and a 40-year cultivated land located at two slope positions (back slope and shoulder) of a hillside in Dorahan, Chaharmahal & Bakhtiari Province. A 60±5 mm.hr-1 rainfall intensity was simulated by a rainulator. Organic matter, mean weighted diameter, saturated hydraulic conductivity, collected runoff and sediments were measured. The differences between the means were tested using T-test. Results showed 35, 53 and 8% increases in the organic matter, mean weighted diameter, and saturated hydraulic conductivity in back slope, respectively. The increases in these parameters in shoulder position were 39, 60 and 33%. The values for runoff and sediments in back slope were 3 and 8 times greater than in other similar positions while the values in the shoulder position were 11 and 55 times greater than the same values in other positions.
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