三峡库区紫色土坡耕地草本植物根系固结地埂的土力学机制
The Mechanics of Soil Reinforcement by Root on the Hedge of the Sloping Cultivated Lands of Purple Soils in the Three Gorges Reservoir Region
查看参考文献15篇
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文摘
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为揭示三峡库区紫色土坡耕地草本植物根系对地埂土壤固结作用的土力学机制,选取库区3种草本地埂植物为研究对象,对3种地埂植物根系的分布特征及抗拉性能进行研究,并分析3种地埂土壤的抗冲性和抗剪强度。研究结果表明,紫花苜蓿、蓑草、桂牧一号的根系总生物量分别为(79.37±1.26),(97.99±1.66),(71.76± 1.96)g/m~2,紫花苜蓿根系在0-10cm土层分布最多,蓑草主要根系分布深度集中在10-20cm,桂牧一号根系分布在0-30cm土层深度范围内呈现出递增的趋势,在30-40cm土层深度根系含量不到10%。3种草本地埂植物根系的平均抗拉力为桂牧一号(7.93N)>蓑草(6.03N)>紫花苜蓿(5.40N),3种地埂植物根系单根抗拉力与根径呈幂函数关系,蓑草地埂植物根系的单根抗拉力与根径的相关性最高。3种地埂植物根系的抗拉强度表现为蓑草根系(45.91MPa)>紫花苜蓿根系(19.68MPa)>桂牧一号根系(15.28MPa)。3种不同草本地埂植物根系间的抗拉力和抗拉强度差异达到显著水平(P<0.05)。3种植物地埂土壤的抗冲性变化为蓑草地埂(85.28L/(min·g))>紫花苜蓿(69.47L/(min·g))>桂牧一号(60.86L/(min·g)),蓑草地埂土壤的抗冲性与紫花苜蓿和桂牧一号间存在显著差异(P<0.05)。3种草本植物地埂土壤的抗剪强度顺序为蓑草地埂(115.49kPa)>紫花苜蓿(91.73kPa)>桂牧一号(75.14kPa)。结果表明,蓑草地埂在三峡库区具有较好的固埂防蚀效果,在三峡库区坡耕地固结地埂土壤中发挥重要作用。三峡库区草本植物固结地埂可为三峡库区坡耕地整治提供新思路。 |
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其他语种文摘
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Aimed to reveal the mechanics of the soil reinforcement by root on the hedge of the sloping cultivated lands of purple soils in the Three Gorges Reservoir region,chosen three herbage hedge plants as the objects of this study.The root distribution and tensile strength of the three herbage hedge plants in the Three Gorges Reservoir region were compared.The results showed that the root biomass of Medicago sativa, Eulaliopsis binata and Pennisetum americanum ×P.purpureum were(79.37±1.26)g/m~2,(97.99± 1.66)g/m~2 and(71.76±1.96)g/m~2,respectively.And the main root of Medicago sativa distributed in the 0 to 10 cm soil depth,the main root of Eulaliopsis binata distributed in the 10 to 20 cm soil depth and the main root of Pennisetum americanum ×P.purpureumdistributed deeper,in the 20 to 30 cm soil depth.The order of the average tensile resistance of the three herbage root were:Pennisetum americanum × P.purpureum(7.93N)>Eulaliopsis binata (6.03N)>Medicago sativa (5.40N).There existed the power function relationship between the tensile resistance and root diameter,and there existed the highest correlation of Eulaliopsis binata roots.Meanwhile,the order of the tensile strength of the three herbage root were:Eulaliopsis binata (45.91MPa)>Medicago sativa (19.68MPa)>Pennisetum americanum ×P.purpureum (15.28 MPa).There exited obviously significant difference of the tensile resistance and tensile strength among the three herbages roots(P<0.05).The order of the soil anti-scouribility of the three herbage hedges were Eulaliopsis binata (85.28L/(min·g))>Medicago sativa (69.47L/(min·g))>Pennisetum americanum × P.purpureum (60.86L/(min·g)),and there existed obviously significant difference among the soil anti-scouribility of the herbage hedges(P<0.05).While the value of the soil shear strength had the similar order.However,there did not existed obviously significant difference among the soil shear strength of the herbage hedges(P>0.05).The results showed that the Eulaliopsis binata hedge had better soil reinforcement and soil conservation in this region.And the herbage reinforced the hedges was a new idea for the sloping cultivated lands harnessing in the Three Gorges Reservoir region. |
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来源
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水土保持学报
,2017,31(1):85-90 【核心库】
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DOI
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10.13870/j.cnki.stbcxb.2017.01.015
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关键词
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三峡库区
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坡耕地地埂
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草本植物根系
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固土力学作用
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地址
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中国科学院水利部成都山地灾害与环境研究所, 中国科学院山地表生过程与生态调控重点实验室, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1009-2242 |
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学科
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农业基础科学 |
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基金
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中国科学院科技服务网络(STS)项目
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国家自然科学基金项目
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国家重点研发计划项目
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文献收藏号
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CSCD:5931010
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