Sareh Rajabi Agereh; Farshad Kiani; Kazem Khavazi; Hassan Rouhipour; Farhad Khormali
Volume 26, Issue 4 , December 2019, , Pages 824-837
Abstract
Nowadays, the destructive phenomenon of desertification and wind erosion is one of the most important environmental crises in the world, which are serious challenges to sustainable production and agricultural land management. In the present study, the effect of microbial precipitation of calcium carbonate ...
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Nowadays, the destructive phenomenon of desertification and wind erosion is one of the most important environmental crises in the world, which are serious challenges to sustainable production and agricultural land management. In the present study, the effect of microbial precipitation of calcium carbonate has been studied as a biological reformer and compatible for controlling wind erosion and soil stabilization. For this purpose, erosion rate of bio-cemented samples was investigated through ….in a wind tunnel under the condition of wind velocity of (0 to 98 km hr-1) in two soil types with sandy and silty texture in a completely randomized design in three replications. Investigation of the threshold velocity of soil particle movement revealed that air dried soil particles begin to move at the velocity of 8 and 10 km hr-1 in the silty and sandy soils respectively, however, in all biological samples (MICP) particles did not move at 97 km.hr-1. The results also indicated that the weight loss of all MICP treatments at different wind velocities were significantly reduced as compare to the control. The amount of the soil loss among biological cemented samples and control treatments were dramatically different at higher velocities. So that, at velocities more than 57 km/h, soil losses indicated significantly enhancement in control, whereas in the soils which are treated by bacteria, soil losses were insignificant and approximately 2.5 kg.m-2.hr-1. The results also showed that the equal's amount of calcium carbonate and the penetration resistance of the soil surface increased significantly in MICP treatments as compare to control treatments, this event indicated the formation of a surface-resistant layer on bio-treated cement samples. In this study, the comparison of used bacteria also showed that Bacillus infantis and Paenibacillus sp3 have high efficiency in controlling wind erosion. Therefore, it seems that cementation by biological methods could be an effective way to stabilize surface particles and control soil erosion.
Hasan Rouhipour
Volume 11, Issue 1 , September 2019, , Pages 59-82
Hasan Rouhipour; Hooman Farzaneh; Hosein Asadi
Volume 11, Issue 3 , August 2019, , Pages 235-254
Kamran Mirzashahi; Hasan Rouhipour
Volume 12, Issue 4 , August 2019, , Pages 395-407
Padideh Javadi; Hasan Rouhipour; Ali Akbar Mahjoubi
Volume 12, Issue 3 , August 2019, , Pages 278-310
shahram schafiee; mohammad khosroshahi; Hassan Rouhipour; ali ashraf jafari; farhad khaksarian; leila kashi zenouzi
Volume 24, Issue 1 , May 2017, , Pages 224-237
Abstract
Due to the limited water resources and low rainfall, finding proper solutions to reduce the water consumption for vegetation production in natural areas has received attention more than ever before. For this purpose, this research was aimed to investigate the effects of superabsorbent polymer and Plantbac ...
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Due to the limited water resources and low rainfall, finding proper solutions to reduce the water consumption for vegetation production in natural areas has received attention more than ever before. For this purpose, this research was aimed to investigate the effects of superabsorbent polymer and Plantbac panels on the efficient use of water on Saxaul (Haloxylon persicum) growth. The study was conducted in the Agricultural and Natural Resources Research Station in Semnan province, Iran. Irrigation in this study was performed according to the soil water suction, reaching to pressures of 1.0, 5.0, and 15.0 bars. The water consumption in each of the aforementioned suctions was to reach the field capacity of the same soil. In addition to the above treatments, rainfed treatment was also considered. Before planting the seedlings, the superabsorbent polymer was mixed with the soil of seedling pits at a weight ratio of 0.6%. The Plantbac panels were placed in the bottom of the pits at dimensions of 60×60×50 cm. Therefore, treatments consisted of superabsorbent polymer and Plantbac panels. The experiment was conducted as a split plot design based on randomized complete block, in which soil water suctions levels were considered as main plot and superabsorbent polymers as sub-plot. The results of the combined effect of both water suctions and superabsorbent polymer showed that the water consumption at these suctions was reduced by prolonging the irrigation intervals to reach higher suctions (more negative). At a soil water suction of 5.0 bars, the water consumption for each seedling was 157 liter, showing 33% decline as compared to the soil containing polymer at the same suction. However, at a suction of 15.0 bars, water consumption in the Plantback declined to 34%. Our results clearly showed that the Plantbac panels could significantly increase the Saxaul growth in different irrigation levels more than that recorded for the control and polymer treatments.
Hamid reza Azimzadeh; Mohammad reza Ekhtesasi; Hossein qoli Refahi; Hassan Rohipour; Manuchehr Gorji; Mohammad hasan Emtehani
Volume 16, Issue 1 , December 2009, , Pages 114-123
Abstract
Reducing the length of field along the wind path can be a major factor in providing protection against wind erosion. Therefore, the study of sediment transported by wind versus the field length and maximum transport capacity is necessary. As the wind passes over eroding soil surface, the quantity of ...
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Reducing the length of field along the wind path can be a major factor in providing protection against wind erosion. Therefore, the study of sediment transported by wind versus the field length and maximum transport capacity is necessary. As the wind passes over eroding soil surface, the quantity of sediment transported by wind increases until the wind stream becomes saturated. In the other word the mass transported is limited by the emission rate of materials from the soil surface to the air flow, known as transport limiting. The field length required for the wind to reach its maximum capacity depends on the wind velocity and the components of the soil surface. The field data were collected from 1.9ha fallow lands of Yazd-Ardakan plain. Big Spring No Eight (BSNE) samplers were set up to collect samples of horizontal sediment discharge passing through a point. Twelve events data were collected and analyzed started from May 2006 to may 2007. Two methods were adopted to determine the maximum transport capacity; 1) Fitting the mathematic equation of and 2) Direct measurement of transport capacity. Variance analysis and t-test paired data results showd that, there was no significant difference between the results of these two methods.