Evaluation of flood spreading and closed treatment effect on vegetation changes in Tanghestan station of Bushehr province

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.