黄河故道风沙区牧草控制风蚀效果的研究

通过野外测试与室内分析相结合的方法，对黄河故道风沙区种植牧草后的土壤风蚀特征进行了研究，结果表明：试验区土壤风蚀季相特征不同，以春季风蚀剧烈，而冬季次之。对照区年风蚀深度达5.2cm，与之相比，牧草种植小区年风蚀深度下降了69．62％～80．58％。不同牧草对风蚀的减弱程度不同，差异明显。种植牧草可增大地表粗糙度，降低近地表风速，风速降低幅度为30．17％～60．31％，达到防止风蚀的目的，并通过生物改良和阻滞堆积使细粒物质增多，增强抗蚀性。

Research on Effect of Wind Erosion Control after Planting Grasses in Wind-sand Region of the Yellow River Old Riverway

The wind erosion characteristics of wind-sand region after planting grasses in Yellow River old riverway were studied by field testing and indoor analysis. The results showed that the seasonal wind erosion characteristics were different in test region, the spring erosion intension was strongest and the winter erosion was stronger. The wind erosion depth of control experiment section reach 5.2cm, but the depth of erosion had declined by 69.62%-80.58% in planting grasses section compared with control section. The lower degree were different in different grasses and the difference was marked. At the same time, the grasses can increase the roughness and reduce the surface velocity, the reduced scope of velocity was 30.17%- 60.31%, so the purpose of wind erosion control was attained after p grasses can increase the fine matter by biological meliorating and block bility of resisting wind erosion. anting grasses. Furthermore, the ng accumulation and gather the ability of resisting wind erosion.