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Showing 3 results for Noura
The Effects of Soil Properties on Runoff and Soil Loss Generation in the Farm Lands of the Chehel-Chai Watershed, Golestan Province
Mahnaz Zarea Khormizi, Ali Najafinejad, Nader Noura, Ataollah Kavian,
Volume 17, Issue 64 (summer 2013)
Abstract
Soil erosion is one of the most important factors affecting soil quantity and quality and is environmental problems in developing countries like Iran. It can have deteriorating effects on ecosystems. This research was carried out in farm lands of the Chehel-Chai watershed, Golestan province to investigate the effect of soil properties on runoff and soil loss. Runoff and soil loss were measured in a completely randomized design in 36 plots with 10×10 m sizes in farm lands. For this reason, this study was conducted using rainfall simulator with 2 mm/min intensity and 15 min duration in 4 replicates. Soil samples were also taken in each plot. Sampling was conducted in October 2009. Results of the Pearson correlation showed that among soil properties, the contents of the lime, silt and fine sand had positive correlations with runoff at 1% confidence level. Also, soil surface resistance at 1% confidence level, the contents of the organic matter and nitrogen at 5% confidence level had negative correlations with soil loss. Finally, the results of multiple linear models showed that the content of lime is effective in estimating runoff and soil surface resistance, and organic matter is effective in estimating soil loss.
The Effect of Hydrated Lime Slurry on Stabilizing Sand Dunes Mobility
G. H. Zoraghi, K. Shabani Goraji, M. R. Noura, A. R. Rashki,
Volume 23, Issue 2 (Summer 2019)
Abstract
Creating a mulch layer on the sand dunes surface has long been applied to reduce their mobility. However, application of oil mulch in some countries, in addition to high costs, has many environmental problems. In this research, the hydrated lime slurry was used as a protective cover on the sand dunes. The slurry was prepared in three treatments with 3, 5 and 7% lime and sprayed uniformly on 2×5 m plots on the sand dunes surface. The average thickness of different types of mulch was measured by a caliper and then their abrasions were calculated in two-month intervals for three calcareous and controlling treatments at three locations. Statistical analysis was performed by using SPSS and the Excel software. The results showed that the 3% lime slurry layer had no resistance to wind abrasion and was comparable to the controlling sites. The results obtained for the 5 and 7% lime slurry mulch layers indicated that the increase in lime percentage raised the mulch resistance against the wind abrasion. The 7% lime slurry layer with a 6.3 mm thickness showed the highest abrasion resistance in the natural conditions.

Investigation of Wind Erosion Threshold in Different Land Cover and the Effect of Soil Properties on It (Case Study: Niatak Region of Sistan)
A.r. Nourafar, A. Pahlavanravi, M. Nohtani, V. Rahdari,
Volume 26, Issue 1 (Spring 2022)
Abstract
Wind erosion is one of the most important natural processes in arid and semi-arid regions. Sistan plain has a hyper-arid climate and is one of the windy regions of the country. Due to the soil characteristics of the Sistan plain, wind erosion is very intense in this region. In this study, the relationships between some soil's physical and chemical properties and wind erosion were investigated in different land cover in a part of the central region of Sistan in 2018. A map of land cover in five classes was prepared using the results of field studies and the classification of satellite images. Fifty soil samples at a depth of 10 cm were collected to investigate the physical and chemical soil properties and the wind erosion threshold was determined at each location using a portable wind tunnel device. Also, the relationship between physical and chemical soil properties including soil texture, soil moisture, specific apparent weight, EC, SAR, ESP, Na+, k+, with the speed of wind erosion threshold was investigated. According to the results, the highest and the lowest threshold speed were 8.2 and 3.8 m s-1 and occurred in agricultural lands and hilly lands, respectively. The results of this study indicated that the velocity of wind erosion threshold in different lands adjacent to sandy areas is less than the average of that cover. Also, the soil texture, EC, and SAR have the most significant effect on soil wind erodibility at P <0.05 in the study area.

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