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Wind tunnel experimental study on the effect of PAM on soil wind erosion control

机译：PAM对土壤风蚀的影响的风洞试验研究

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摘要

In recent years, high-molecular-weight an-ionic polyacrylamide (PAM) have been widely tested on a variety of soils, primarily in water erosion control. However, little information is available regarding the effectiveness of PAM on preventing soil loss from wind erosion. The research adopted room wind tunnel experiment, two kinds of soils were used which were from the agro-pastoral area of Inner Mongolia, the northwest of China, the clay content of soils were 22.0 and 13.7%, respectively. For these tests, all the treatments were performed under the condition of wind velocity of 14 m s~(-1) and a blown angle of 8.75%, according to the actual situation of experimented area. The study results indicated that using PAM on the soil surface could enhance the capability of avoiding the wind erosion, at the same time, the effect of controlling wind soil erosion with 4 g m~(-2) PAM was better than 2 g m~(-2) PAM's. Economically, the 2 g m~(-2) PAM used in soil surface can control wind erosion effectively in this region. The prophase PAM accumulated in soil could not improve the capability of avoiding the wind erosion, owing to the degradation of PAM in the soil and the continual tillage year after year. The texture of soil is a main factor influencing the capability of soil avoiding wind erosion. Soil with higher clay content has the higher capability of preventing soil from wind erosion than one with the opposite one under the together action of PAM and water.
机译：近年来，高分子量阴离子聚丙烯酰胺（PAM）已在各种土壤上进行了广泛测试，主要是在水蚀控制方面。但是，关于PAM防止风蚀造成的土壤流失的有效性的信息很少。该研究采用室内风洞试验，采用了来自内蒙古农牧区的两种土壤，分别为中国的西北地区，土壤的粘土含量分别为22.0％和13.7％。对于这些测试，根据实验区域的实际情况，在风速为14 m s〜（-1），吹角为8.75％的条件下进行所有处理。研究结果表明，在土壤表面使用PAM可以增强抗风蚀能力，同时4 gm〜（-2）PAM对风蚀的控制效果要优于2 gm〜（- 2）PAM。从经济上讲，用于土壤表面的2 g m〜（-2）PAM可以有效控制该地区的风蚀。由于土壤中PAM的降解和逐年的持续耕作，土壤中积累的PAM前期不能提高抗风蚀能力。土壤质地是影响土壤抗风蚀能力的主要因素。在PAM和水的共同作用下，粘土含量较高的土壤比另一种土壤具有更高的防风蚀能力。

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