摘要:为探究紫色土坡地植物篱篱前淤积带与篱下土坎处土壤贮水能力和抗剪性能的差异及变化规律，选取四川遂宁水土保持试验站10°新银合欢植物篱小区（L10）、10°香根草植物篱小区（V10）和15°香根草植物篱小区（V15），分上、中、下坡采集篱前淤积带和篱下土坎（无下坡）0-30 cm耕层土壤，测定土壤基本物理性质和土壤抗剪强度，计算土壤水库总库容、滞洪库容、内摩擦角φ和粘聚力c。结果表明：（1）同一篱带，篱前淤积带土壤保水贮水能力优于篱下土坎，其中篱前淤积带土壤自然含水率较之篱下土坎显著高6.52%-12.13%。（2）同一篱带，篱下土坎土壤透气性以及土壤抗剪性能均优于篱前淤积带，其中篱下土坎土壤非毛管孔隙度较之篱前淤积带显著高5.61%-57.70%。（3）同一小区，篱前淤积带保水贮水能力均表现为下坡 > 中坡 > 上坡，而篱下土坎均为上坡>中坡。其中V15小区上述趋势最明显，其下坡篱前淤积带（上坡篱下土坎）的土壤总库容和滞洪库容分别为上坡篱前淤积带（均为中坡篱下土坎）的1.04倍和1.03倍（1.02倍）。（4）同一小区，篱前淤积带土壤内摩擦角、粘聚力c和抗剪强度均表现为上坡 > 中坡 > 下坡，篱下土坎均为上坡>中坡。其中V10小区上述趋势最明显，其上坡篱前淤积带（上坡篱下土坎）上述指标依次为下坡篱前淤积带（均为中坡篱下土坎）的1.06、1.09倍和1.05倍（1.04倍）。（5）一个雨季前后篱前淤积带和篱下土坎土壤透气性、保水贮水能力及抗剪性能均无显著变化。



Abstract:The aim of the present study was to explore the differences and variation of the water storage capacity of soil and shear performance between the sedimentation zone in front of and ridge behind hedgerows on Purple Soil Slopping Farmland. This study set 10° Leucaena leucocephala hedgerows (plot L10), 10° Vetiveria zizanioides hedgerows (plot V10), and 15° V. zizanioides hedgerows (plot V15), from the Soil and Water Conservation Experimental Station in Suining, Sichuan. There were sedimentation zones in front of the hedgerows on the up, middle, and down slopes and a ridge behind the hedgerows on the up and middle slopes at each plot. We collected samples of arable soil from these zones to a 30 cm depth. Some basic physical properties and shear strength of soil were measured, and soil total storage capacity, flood detention storage, internal friction angle φ, and cohesion c were calculated. The results showed that:(1) in the same plots, the water storage capacity of the sedimentation zone in front of the hedgerows was better than that of the ridges behind the corresponding hedgerows, and that the sedimentation zone had a higher natural water content by 6.52%-12.13%; (2) soil disturbance and shear resistance of the ridges behind the hedgerows were higher than that of the sedimentation zone in front of the corresponding hedgerows. The soil non-capillary porosity of ridges behind the hedgerows was significantly higher than that of the sedimentation zone in front of the hedgerows by 5.61%-57.70%; (3) in the same plot, the water storage capacity in the sedimentation zone in front of the hedgerows showed the following order:down slope > middle > up slope, and that of the ridge behind hedgerows was up > middle slope. This trend was obvious in plot V15; the soil total storage capacity and flood detention storage of the sedimentation zone in front of the hedgerows on the down slope were 1.04 times and 1.03 times higher than those of the up slope, respectively, and those of the ridge behind the hedgerows on the up slope were all 1.02 times higher than that of the middle slope; (4) in the same plot, the internal friction angle φ, cohesion c, and shear strength in the sedimentation zone in front of the hedgerows were in the order of up > middle > down slope, and that on the ridge behind the hedgerows were up > middle slope. This was evident in plot V10, where the internal friction angle φ, cohesion c, and shear strength of the sedimentation zone in front of the hedgerows on the up slope were 1.06, 1.09 and 1.05 times greater than those of the down slope, respectively. However, those of the ridge behind the hedgerows on the up slope were all 1.04 times higher than that of the middle slope; (5) the rainy season had no significant effect on soil disturbance, water storage capacity, and shear performance for both the sedimentation zone in front of and ridge behind the hedgerows.





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