Ali Jafari; Davood Nikkami; Esmail Abbasi; Fateme Tavakoli Rad
Abstract
Improper land use management has inverse impacts on available resources. To reduce these environmental and economic effects of soil erosion, there is a need for proper watershed plans. Land use optimization is of the solutions for achieving sustainable development and reducing the loose of resources. ...
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Improper land use management has inverse impacts on available resources. To reduce these environmental and economic effects of soil erosion, there is a need for proper watershed plans. Land use optimization is of the solutions for achieving sustainable development and reducing the loose of resources. The main objective of this research was determining the optimal level of land use to increase the income of residents and reducing the effect of erosion in the Sana Dam Watershed. To apply an optimal pattern of land used for minimizing soil erosion and maximizing land income by a multi-objective programming model, optimal scenarios were chosen proportion to the shape of objective functions and constraints. For this purpose a linear programming model was used for three different scenarios of a) present land use conditions b) present land use condition with some applied land use management and c) standard land use conditions according to principles and scientific criteria. The results showed that present land use is not in optimal level and should be changed. Also, results demonstrated that the amount of soil erosion could be decreased by 5.3, 31.7 and 43.4 percent and the amount of net income could be increased by 47.73, 242.57 and 242.57 percent by land use optimization in present land use conditions, present land use condition with some applied land use management and standard land use conditions, respectively.
Ali Jafari; Hassan Khosravanian; Farhad Fakhri
Abstract
In most projects of watershed management, studies are necessary for monitoring, evaluation and comparing the parameters with the indices in projects. In water spreading projects there is such a necessity for measure, process and evaluate obtained information from performance results. According to the ...
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In most projects of watershed management, studies are necessary for monitoring, evaluation and comparing the parameters with the indices in projects. In water spreading projects there is such a necessity for measure, process and evaluate obtained information from performance results. According to the important role of aquifer management in rangeland improvement, as a new method, the purpose of this study is investigation and evaluation of flood spreading effects on vegetation cover changes and status and trend of rangeland during 2000 to 2004 years. In this study, two areas of flood spreading and testimonial control points were selected. Flood spreading network consisted of five strips and 12 fixed plots (2×2 m) were chosen in each strip with random-regular method. A testimonial area was selected to evaluate the results with eight plots similar to flood spreading areas. Results demonstrated that the status of rangeland condition in testimonial area was very weak and in flood spreading area was very weak to weak and was changing from to moderate condition. The trend of rangeland in testimonial area was negative while in flood spreading area was positive. Also, results showed that the forage production were 144.3 and 113.6 kg per hectare in the first year and 224.5 and 202.3 kg per hectare in the last year, in flood spreading and testimonial areas respectively.
