Li Shenghui, Li Chengzhi, Fu Xiaolei
Institute of Arid Ecology and Environment, Xinjiang University, Urumqi, 830046, China.
College of Resources and Environmental Sciences, Xinjiang University, Urumqi, 830046, China.
Sci Rep. 2021 May 7;11(1):9746. doi: 10.1038/s41598-021-89151-1.
Soil salt crust can change the structure of aeolian soil and improve its resistance to wind erosion. Four ions (Na, Ca, Cl, and SO) with high contents in aeolian soil were selected for a salt crust experiment. The experiment set a variety of gradients of soil salt contents and salt mixing ratios of NaSO and CaCl. The physical properties of the salt crust were tested, and the wind erosion resistance of the salt crust was discussed. The results showed that the soil salt contents and salt mixing ratio influenced the resistance of the salt crust, especially in terms of its compressive strength and toughness. The former affected the compressive strength of the salt crust by changing the amount of cemented soil salt. The latter affected the kinds of crystals by changing the ion ratio, thus changing the structure of the salt crust and affecting its wind erosion resistance. The wind erosion resistance of the salt crust is complicated by the interaction between the soil salt content and salt mixing ratio. A multilayer crust can be formed in mixed salt, which has a strong wind erosion resistance. This result provides new findings on flowing sand soil and a new method for the treatment of flowing sand soil.
土壤盐结皮能够改变风沙土结构，提高其抗风蚀能力。选取风沙土中含量较高的4种离子（Na、Ca、Cl和SO）进行盐结皮实验。该实验设置了多种土壤含盐量梯度以及Na₂SO₄与CaCl₂的盐混合比例。对盐结皮的物理性质进行了测试，并探讨了盐结皮的抗风蚀性能。结果表明，土壤含盐量和盐混合比例影响盐结皮的抗性，尤其在抗压强度和韧性方面。前者通过改变胶结土盐量影响盐结皮的抗压强度。后者通过改变离子比例影响晶体种类，进而改变盐结皮结构并影响其抗风蚀能力。土壤含盐量与盐混合比例之间的相互作用使盐结皮的抗风蚀性能变得复杂。混合盐中可形成多层结皮，其具有较强的抗风蚀能力。这一结果为流沙土壤提供了新的研究发现以及治理流沙土壤的新方法。
