段青松, 王金霞, 和贵祥, 杨旸, 余建新, 刘宇飞, 李永梅. 不同草本植物根土复合体无侧限抗压强度增量与根系分布特征关系[J]. 云南大学学报(自然科学版), 2019, 41(4): 832-841. doi: 10.7540/j.ynu.20180420
引用本文: 段青松, 王金霞, 和贵祥, 杨旸, 余建新, 刘宇飞, 李永梅. 不同草本植物根土复合体无侧限抗压强度增量与根系分布特征关系[J]. 云南大学学报(自然科学版), 2019, 41(4): 832-841. doi: 10.7540/j.ynu.20180420
DUAN Qing-song, WANG Jin-xia, HE Gui-xiang, YANG Yang, YU Jian-xin, LIU Yu-fei, LI Yong-mei. Relationship between the increment of unconfined compressive strength of root-soil and the root distribution characteristics[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(4): 832-841. DOI: 10.7540/j.ynu.20180420
Citation: DUAN Qing-song, WANG Jin-xia, HE Gui-xiang, YANG Yang, YU Jian-xin, LIU Yu-fei, LI Yong-mei. Relationship between the increment of unconfined compressive strength of root-soil and the root distribution characteristics[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(4): 832-841. DOI: 10.7540/j.ynu.20180420

不同草本植物根土复合体无侧限抗压强度增量与根系分布特征关系

Relationship between the increment of unconfined compressive strength of root-soil and the root distribution characteristics

  • 摘要: 研究草本植物根土复合体无侧限抗压强度增量与根系分布特征关系,可以为草本植物根系固土能力计算及草种选择提供依据. 用应变控制式三轴仪测定了种植在PVC管内3种草本植物根土复合体及素土柱体的无侧限抗压强度,2013WinRHIZO 根系分析系统测定了根系分布特征. 结果表明:①和素土柱体相比,在0~25 cm深度范围内非洲狗尾草、鸭茅、紫花苜蓿根土复合体无侧限抗压强度增量(Δc)分别为4.75、4.00、1.11 kPa,在25~50 cm深度范围为3.20、2.33、0.83 kPa. ②紫花苜蓿的根系平均直径(Da)、根长密度(ρLen)、根表面积密度(ρSA)与另2种草差异极显著. ③非洲狗尾草、鸭茅的Δc与含根量(Q)、ρLenρSA、根体积密度(ρRV)和Da显著或极显著相关,紫花苜蓿的ΔcρLenρSA极显著相关,与ρRVQDa不相关. 结果表明在草本植物根系的QρLenρSAρRVDa等分布特征值中ρLenρSA与根土复合体Δc显著相关,可用它们来预测根系的固土能力,在受试的3种植物中非洲狗尾草根系固土能力最强.

     

    Abstract: To provide the basis for calculating the slope stability and selecting the type of herbs, the relationship between the increment of unconfined compressive strength of root−soil and the root distribution characteristics were investigated. The additional cohesion (Δc) of root−soil of three herbs, which were planted in the PVC tubes, was measured by the unconfined compressive test. The values of root distribution characteristics were estimated by 2013WinRHIZO. The results showed that: ① At depth of 0~25, the Δc of Setaria anceps Stapf ex Massey L., Dactylisglomerata L. and Medicago sativa L. was 4.75, 4.00 kPa and 1.11 kPa, respectively. At depth of 25~50 cm, the Δc was 3.20, 2.33 kPa and 0.83 kPa, respectively; ② The values of root distribution characteristics of Medicago sativa L, including root length density (ρLen), root surface area density (ρSA) and average diameter (Da), were significantly different with that of Setaria anceps Stapf ex Massey L. and Dactylisglomerata L. ; ③ The Δc of Setaria anceps Stapf ex Massey L. and Dactylisglomerata L. had significant or extremely significant correlation with Q, ρLen, ρSA, ρRV and Da. The Δc of Medicago sativa L. had a significant quadratic correlation with ρLen and ρSA, and its Δc had no correlation with ρRV, Q and Da. The conclusions are as follow: The Δc of root−soil had significant correlation with ρLen and ρSA. The ρLen and ρSA could be used to predict the soil reinforcement capacity of root system. Moreover, the soil reinforcement capacity of Setaria anceps Stapf ex Massey L was the best.

     

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