PAM控制土壤风蚀的风洞实验研究  

Wind Tunnel Experimental Study on Soil Wind Erosion Control with PAM

作　　者：和继军[1] 蔡强国[1] 唐泽军[2] 

机构地区：[1]中国科学院地理科学与资源研究所中国科学院陆地水循环与地表过程重点实验室 [2]中国农业大学水利与土木工程学院,北京100083

出　　处：《水土保持学报》2007年第2期12-15,共4页Journal of Soil and Water Conservation

基　　金：973国家重点基础研究发展计划资助(2007CB407207)

摘　　要：风蚀是我国干旱、半干旱地区土壤退化的主要影响因素。本实验采用室内风洞实验,研究了不同PAM处理对土壤的风蚀控制效果。实验土壤分别是黏粒含量为28.0%的壤土和黏粒含量为15.2%的砂壤土,实验条件为固定风速14 m/s、固定吹角5°。研究表明,对土壤表层覆盖PAM可以增加土壤的抗风蚀能力,有效地减少土壤风蚀,增加PAM使用量可以进一步增加土壤的抗风蚀能力,即4 g/m2PAM用量的效果要好于2 g/m2PAM的用量;前期累积在土壤中的PAM不能明显增加土壤抗风蚀的能力;在水分和PAM的共同作用下,黏粒含量高的土壤的抗风蚀能力要强于黏粒含量低的土壤。Soil wind erosion is one of the most serious land degradation problems in the arid and semi-arid regions. Wind tunnel experiments were conducted to Research the change process of soil wind erosion with the change of PAM controlling the soil wind erosion under the condition of the constant wind velocity of 14 s/m and the constant blown angle of 5°. Two soils were used in the process of experiments, the clay content of which is 28.0% and 15.2%, respectively. The study results indicated that using PAM on the soil surface could enhance the capability of soil avoiding the wind erosion, at the same time, the effect of controlling wind soil erosion with 4 g/m^2 PAM was better than with 2 g/m^2 PAM. The prophase PAM used in the soil could not increase the capability of soil avoiding the wind erosion much more. Soil with higher clay content has the higher capability preventing soil from wind erosion than one with less clay content under the together action of PAM and water.

关 键 词：农牧交错区 土壤风蚀 聚丙烯酰胺 风洞试验 

分 类 号：S157.1[农业科学—土壤学]