植被混凝土边坡土壤团聚体的稳定性与可蚀性
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国家自然科学基金面上项目(51979147);内蒙古自治区科技重大专项(2021ZD0007–03)


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    摘要:

    以湖北省宜昌市内恢复年限为1、3、5、18 a的植被混凝土生态修复边坡土壤为研究对象,采用Le Bissonnais法分析快速湿润(FW)、慢速湿润(SW)和机械扰动(WS)等3种处理条件下土壤团聚体的稳定性和可蚀性。结果表明:SW处理下土壤团聚体以≥5.00 mm粒径为主,WS处理下土壤以≥5.00 mm粒径团聚体的占比最高,但其值低于SW处理的,FW处理下<0.25 mm的土壤团聚体粒径占比最高,说明土壤团聚体经FW处理后破碎程度大,SW处理后破碎程度小;土壤团聚体平均质量直径(MWD)和几何平均直径(GMD)值均表现为SW处理中的最高,FW处理中的最低,而土壤可蚀性值(K)则与其相反,同一恢复年限的边坡土壤的相对消散指数均大于其相对机械破碎指数,说明快速湿润引起的消散作用是土壤团聚体破碎的主要机制;SW和WS处理下已恢复18 a的边坡土壤的粒径≥2.00 mm的团聚体占比最高,<0.25 mm的占比最低,MWD和GMD值最大,K值最小。可见,大暴雨冲刷可能会导致植被混凝土边坡土壤结构不稳定并发生侵蚀,且随着恢复年限的增加植被混凝土边坡土壤结构逐渐趋于稳定。

    Abstract:

    The stability and erodibility of soil aggregates under three treatment conditions, including fast wetting(FW), slow wetting(SW) and mechanical disturbance(WS), were analyzed using the Le Bissonnais method in this study. The experimental materials were the soil of vegetated concrete ecological restoration slopes with restoration years of 1, 3, 5 and 18 a in the city of Yichang, Hubei Province. The results showed that soil aggregates under SW treatment were dominated by ≥5.00 mm particle size, soil under WS treatment had the highest percentage of aggregates with ≥5.00 mm particle size, but its ratio was lower than that of SW treatment, and soil aggregates with <0.25 mm particle size had the highest percentage under FW treatment, indicating that soil aggregates were highly fragmented after FW treatment, and less fragmented after SW treatment. The mean mass diameter(MWD) and geometric mean diameter(GMD) values of soil aggregates were the highest in the SW treatment and the lowest in the FW treatment, while the soil erodibility value(K) was the opposite. The relative dissipation index(RSI) of soils were greater than their relative mechanical fragmentation index(RMI) at the same restoration years, indicating that dissipation induced by rapid wetting was the main mechanism of soil aggregate fragmentation. Under the SW and WS treatments, soils from the slopes with restoration years of 18 a had the highest percentage of ≥2.00 mm grain size aggregates, the lowest percentage of <0.25 mm, the largest MWD and GMD values, and the smallest K values. It could be seen that heavy rainstorm scouring might lead to soil structure instability and erosion of vegetated concrete slopes, and the soil structure of vegetated concrete slopes gradually tended to be stabilized with the increase of restoration years.

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马佳鑫,夏栋,艾尚进,舒倩,马悦阳,刘芳,闫书星.植被混凝土边坡土壤团聚体的稳定性与可蚀性[J].湖南农业大学学报:自然科学版,2023,49(6):.

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  • 在线发布日期: 2024-01-15
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