石漠化边坡格构内植被水泥土蓄水持水试验

Test on Rainfall Storage and Water-retaining Capability of the Vegetated Cement Soil in Lattices of Rocky Desertificated Slopes

为了探究格构内蓄水型植被水泥土生态修复石漠化边坡的可行性,开展了纯土、纯土+植株孔、2%和4%水泥含量土、4%水泥含量土+植株孔的叠合式土柱降雨蓄水和干燥持水特性试验,包括降雨入渗-干燥-降雨入渗过程。通过测试降雨阶段土柱的降雨优先流渗入渗出、干燥阶段表层土裂隙发育情况、降雨-干燥-降雨阶段土柱内部的水力特性,探究蓄水型植被水泥土在石漠化边坡植被恢复中的降雨蓄水和干燥持水特性。结果表明:降雨入渗阶段植株孔会形成降雨优先流,发挥其蓄水漏斗的作用,4%水泥含量土+植株孔的土柱蓄水效果最佳,蓄水增幅为37%。干燥阶段植被水泥土能抑制裂隙的发育,减少水分蒸发,有利于持水。因此,石漠化边坡格构内植被水泥土具有良好的降雨蓄水和干燥持水能力,有利于石漠化边坡的植被恢复。

In order to explore the feasibility of ecological restoration of rocky desertificated slope by vegetated cement soil with water storage in lattice structure, the preferential rainfall seepage tests of composite soil columns with pure soil, pure soil + plant hole, 2 % and 4 % cement content soil, and 4 % cement content soil + plant hole are carried out, including rainfall infiltration-drying-rainfall infiltration process. By means of the tests, the rainfall storage and water retaining characteristics of vegetated cement soil in rocky desertification slope are explored, respectively in the rainfall preferential infiltration and water storage stage, and the development of surface soil fissure in drying stage. The results show that during the rainfall infiltration stage, the plant hole will form the rainfall preferential flow and play the role of water storage.The soil column with 4% cement content plus plant hole has the best water storage effect,with an increase of 37%.Vegetated cement soil in drying stage can restrict the development of cracks and water evaporation.Therefore,vegetated cement soil in rocky desertification slope lattice has good water storage capacity,which is conducive to vegetation restoration on rocky desertificated slope.