| There were severe wind erosion in water erosion and wind erosion crisscross region in the northern of Loess Plateau. Strong wind erosion not only can cause and aggravate land desertification and ecological environment deterioration, but also this region was on the condition that there was the severe soil erosion and this region was an important source of the sediments of Yellow River. Chemical regulation measures of wind erosion, which were different from the traditional measures, was the emerging wind erosion regulation techniques which were simple, quick and so on. Researches of the chemical material on wind erosion regulation can help understand the regulation effect and regulation mechanism. The study can supply scientific basis for the wind erosion regulation and promote the further development of chemical regulation measures of wind erosion in this region.The research of the chemical material on wind erosion regulation is studied under indoor wind tunnel experiments with the wind velocities of 6.5,7.9,8.6,9.6,10, 11 m/s under air-dry moisture content, moreover, this research was also with the wind velocity of 12m/s under the moisture content of 1.24%、1.88%、2.03%、2.37%、2.87%、 3.29% and the wind velocity of 14 m under the moisture content of 1.53%、2.6%> 3.66%、3.81%、4.71%、7.11%. The effect of wind velocity and moisture content on the wind erosion was studied. The research is studied with the wind velocity of 14 m/s and dosage of 0.4 g/m2,0.6 g/m2 and 1.2 g/m2 and the cast way of spraying and air-dry moisture content, the regulation of Jag C162, PAM, HP-120, CMC on the wind erosion was studied. The research is studied with the wind velocity of 14 m/s and dosage of 0.4 g/m2,0.6 g/m2 and 1.2 g/m2 and air-dry moisture content, the regulation of Jag C162, PAM, HP-120,CMC on the surface crust under wind erosion was studied. The main results are as follows:1. The effect of wind velocity and moisture content on the wind erosion of loam soil and sandy soil were analyzed:(1) the wind erosion rates of loam soil and sandy soil increased with the increase of wind velocity, which can be well described by exponential equations. The wind speed of 10 m/s is critical wind speed that serious erosion occurred. (2) Compared with the contrast at different wind speed, the particle size distribution of the sediments of wind erosion were coarser than the contrast, the particle diameters were mainly concentrated in the 0.5～1mm and 0.1～0.25 mm. (3) The median particle size of the sediments of wind erosion of loam increased with the increase of the wind speed and the increase rate is small. The median particle size of the sediments of wind erosion of sandy soil were performed the alternate trend of first increases and then decreases. (4) The wind erosion rates of loam and sandy soil decreased with the increase of the moisture content under the wind speed of 12 m/s and 14m/s and which can be well described by exponential equations.(5) The particle diameters of the loam and sandy soil wind erosion sediments under different moisture content were mainly concentrated in the 0.5～1mm and 0.1-0.25 mm when the wind speeds were 12 m/s and 14 m/s.(6)The median particle size of the sediments of wind erosion of sandy soil were performed the alternate trend of first increases and then decreases with the increase of the soil moisture content.2. The regulation effect of Jag C162、PAM.HP-120、CMC on the wind erosion of loam soil and sandy soil were revealed:(1) Spraying PAM, Jag C162, CM and HP-120 to loam can reduced wind erosion and spraying amount have a positive influence for reducing wind erosion. (2) The particle size distribution of the sediments of wind erosion when spraying PAM, Jag C162, CM and HP-120 to loam were similar than the contrast and the particle diameters were mainly concentrated in 0.1-0.25 mm. (3) the median particle size of the sediments of wind erosion of loam soil when spraying PAM, Jag C162, CM and HP-120 were mainly greater than the contrast. (4) Spraying PAM, Jag C162, CM and HP-120 to sandy soil can reduced wind erosion and spraying amount have a positive influence for reducing wind erosion. CMC was the best one to reduce wind erosion and PAM was worst to reduce wind erosion. (5) Spraying Jag C162, CM and HP-120 to sandy soil can effectively prevent soil particles in 0.5～1mm wind erosion. However, Spraying PAM to sandy soil can effectively prevent soil particles in 0.1-0.25mm wind erosion.(6) The median particle size of the sediments of wind erosion of sandy soil when spraying PAM, Jag C162, CM and HP-120 were mainly smaller than the contrast.(7) Spraying PAM is better to reduce wind erosion of loam soil than sandy soil. Spraying Jag C162, CM and HP-120 are better to reduce wind erosion of sandy soil than loam soil.3. The regulation effect of Jag C162、PAM、HP-120、CMC with different dose on the soil surface characteristic were studied:(1)Loam soil crust hardness and thickness increased with the increase of spraying dose, at 0.4 g/m2 dose, soil crust hardness of spraying HP-120 was biggest and soil crust hardness of spraying Jag C162 was minimum. At 0.6 g/m2 and 1.2 g/m dose, soil crust hardness of spraying PAM was biggest and soil crust hardness of spraying HP-120 was minimm. (2) Loam soil crust hardness and thickness of spraying Jag C162、PAM、HP-120、CMC with different dose were greater than the contrast and PAM was the best one to increase soil crust thickness and HP-120 was worst to increase soil crust thickness.(3) Sandy soil crust hardness and thickness increased with the increase of spraying dose. Soil crust hardness of spraying CMC was biggest and soil crust hardness of spraying PAM was minimum. At 0.4 g/m2 and 0.6 g/m dose, soil crust thickness of spraying CMC was best, soil crust thickness of spraying HP-120at 0.4 g/m2 dose was biggest. (4)Sandy soil crust hardness and thickness of spraying Jag C162、PAM、HP-120、CMC with different dose were greater than the contrast and CMC was the best one to increase soil crust hardness and HP-120 was worst to increase soil crust thickness.(5) Loam soil crust hardness and thickness of spraying PAM were greater than sandy soil, However, Loam soil crust hardness and thickness of spraying Jag C162、CMC、 HP-120 were smaller than sandy soil. PAM was the best material to increase loam soil crust hardness and thickness and which was the worst material to increase sandy soil crust hardness and thickness. CMC was the best material to increase sandy soil crust hardness and thickness. Spraying Jag C162、PAM、HP-120、CMC to sandy soil was better to increase soil crust hardness and thickness than loam soil.4. The regulation mechanism of Jag C162、PAM、HP-120、CMC on the wind erosion of loam soil and sandy soil were clarified:Wind erosion depended on the interaction between wind power and soil surface characteristic. Spraying Jag C162, PAM, HP-120 and CMC to loam soil and sandy soil can effectively reduce wind erosion because of the change of soil surface characteristic. |
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