毛乌素沙地砒砂岩与沙复配成土技术固沙效应

为研究砒砂岩与沙复配成土技术的固沙效应,本研究采用试验小区与大田试验相结合的方法,监测了土壤结皮厚度、土壤冻层深度、土壤水分、地表粗糙度和积雪消融等表征固沙效果的相关指标。结果表明:随着砒砂岩的引入,复配土中黏粉粒含量增加,土壤饱和导水率降低,而土壤含水量、结皮厚度、地表粗糙度和冻层深度都有所增加,复配土抗风蚀能力增强。在冬季,通过发展保护性耕作,农作物残茬、根系以及土地整治之后地形因素的改变等对防止土壤风蚀也起到了积极的作用。该研究可为砒砂岩与沙复配成土造田技术的固沙效应提供更充分的理论依据。

Sand-fixing Effects of Compound Soil by Mixing Feldspathic Sandstone and Sand in the Mu Us Sandy Land

To research the sand-fixing effects of compound soil by mixing feldspathic sandstone and sand, we monitor the soil crust thickness, depth of soil freezing, soil moisture, surface roughness, snow melt, and other related indicators by using the method of combining experimental plot and field experiment. With the introduction of the feldspathic sandstone in the compound soil, clay-silt content increased, the soil saturated hydraulic conductivity decreased, while soil moisture, crust thickness, surface roughness and frozen layer depth have increased, capacity of resist wind erosion enhanced. In the winter, through the development of conservation tillage, crop residues, root, the changes of terrain factors after land remediation, and other measures to prevent soil erosion also played a positive role.