绿洲荒漠交错带风沙土盐结皮抗风蚀特性分析

Anti-Wind Erosion Characteristics of Aeolian Sandy Soil Salt Crust in Oasis-Desert Ecotone

为明确风沙土无机结皮的抗风蚀特性,对古尔班通古特沙漠边缘的绿洲荒漠交错带实地取样,基于实验测试和地统计学方法,分析绿洲荒漠交错带土壤盐结皮抗风蚀特性。结果表明:土壤表层形成的盐结皮中土壤粒径越大,形成盐结皮所需的水溶性盐量越多,土壤粒径越小,形成盐结皮所需的水溶性盐量越小,土壤平均粒径和水溶性盐含量呈正相关关系;土壤盐结皮与抗剪切力之间存在明显正相关关系,盐结皮厚度越大,抗剪切力也越大;土壤颗粒越小,形成的盐结皮越致密,同等厚度条件下的盐结皮较土壤粒径大的盐结皮抵抗风力侵蚀的能力越强。研究结果可作为绿洲荒漠交错带风沙治理和土壤风蚀防治的生态学参考。

In order to clarify the wind erosion resistance characteristics of the inorganic crusts of aeolian sand,the oasis desert interlace zone on the edge of the Gurbantunggut desert was sampled on the spot.The soil salt crust anti-wind erosion characteristics of the oasis desert interlace zone were analyzed based on experimental tests and geostatistics.The results show that:The larger particle size of the salt crust formed in the soil surface layer,the more water-soluble salt required to form the salt crust,and the smaller soil particle size,the amount of water-soluble salt required to form the salt crust,the soil average particle size and water-soluble salt content have a positive correlation.There was a clear positive correlation between the soil salt crust and the shear resistance,the greater the thickness of the salt crust,the greater the shear resistance.The smaller soil particles,the denser the salt crusts formed,and the stronger the salt crusts under the same thickness conditions than the salt crusts with larger particle sizes.The research results can be used as ecological reference for wind and sand control and soil wind erosion control in the oasis-desert ecotone.