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Introduction and Objective: Protecting and recovering bare and uncovered soils, as well as diverting surface runoff from the soil, is an efficient method for reducing soil erosion in sensitive and erosion-prone areas. Among the activities to prevent soil erosion are maintaining the natural vegetation of the area and stabilizing bare and uncovered soils with the help of temporary or permanent methods. Therefore, in the current research, the aim was to temporarily stabilize soil using protective covering treatments such as jute, straw, wood chips, festuca grass cover and nano zeolite super absorbent to reduce the amount of runoff and sediment.
Material and Methods: In order to measure the amount of runoff and sediment in the Darabkola forest, plots with dimensions of 70x50 cm and a depth of 10 cm were created using galvanized sheet. Then, plots are placed on the ground with the slope of 3 percent. Erosion control blanket treatments made of jute filled with wood chips, straw and nanozeolite superabsorbent were prepared and located in the plots, as well as jute cover, jute cover with festuca grass and festuca grass. Rain simulation tests was conducted for each sample (30 minutes with an intensity of 50 mm.h-1) and the amount of runoff from the plots was measured at 5-minute intervals using a graduated cylinder placed at the bottom of the plots. Sediment concentration was also measured by weighing the samples after settling the runoff and passing it through filter paper. Sediment concentration is calculated by dividing the amount of sediment by the volume of runoff. Data analysis were done using one-way anova for 7 treatments. Duncan's test was used to compare the means. Pearson's correlation analysis was also used to investigate the relationship between runoff and sediment concentration in runoff.
Results: The results of statistical analysis showed that the highest amount of runoff was belonged to the control treatment, with 0.77 mm.h-1 and the lowest amount was from the treatment of straw and the herbaceous species of festuca with 0.24 and 0.27 mm.h-1, respectively. Overall, the treatment of straw reduced the amount of runoff by 69% and the treatment of herbaceous species of festuca reduced it by 64% comparing with the control plot. The results related to sediment concentration also showed a 63% and 52% decrease in the amount of sediment in the samples compared to the control plot which was belonged to the treatment of jute cover and jute cover together with festuca species, respectively.
Conclusion: this research showed that the use of erosion control blanket with combinations of different materials such as straw and stubble, nano zeolite and wood chips along with festuca grass cover can reduce the volume of runoff and reduce soil erosion and waste especially in forest road trenches that have soils without vegetation. Also, grass cover such as Festuca increases the water permeability in the soil and prevents soil loss. Therefore, using these erosion blanket can reduce the soil erosion around forest roads.
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Type of Study: Research | Subject: حفاظت آب و خاک
Received: 2023/06/17 | Revised: 2023/10/27 | Accepted: 2023/10/28

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