MAHAI Tiancai.Distribution and Mechanical Properties of Different Herbaceous Plant Roots[J].Northern Horticulture,2018,42(19):71-77.[doi:10.11937/bfyy.20180374]
不同草本植物根系的抗压动力学特征
- Title:
- Distribution and Mechanical Properties of Different Herbaceous Plant Roots
- Keywords:
- herbaceous plant; side slope; root mechanics
- 文献标志码:
- A
- 摘要:
- 以广泛应用在公路边坡的4种常见草本植物为试验材料，测定根系在土体中的垂直分布规律及根系抗拉、原状土体抗压和抗崩解等力学指标，研究草本植物根系动力学特征及其抗压力，为定量分析根系抗拉力学特性提供参考。结果表明：4种草本植物0~30 cm土层根系生物量表现为麦冬>黑麦草>白三叶>满天星，且主要集中于0~10 cm土层中；根系抗拉力表现为麦冬>黑麦草>白三叶>满天星，且根系极限抗拉强度与直径呈显著的幂函数负相关关系，决定系数均大于0.900 0（P＜0.05）；平均根径与平均抗拉强度表现出一致的变化规律，表现为麦冬>黑麦草>白三叶>满天星。相关性分析发现，不同植物根系的抗拉强度和直径存在极显著的负相关性（P＜0.001）。根-土复合体抗压强度表现为麦冬>黑麦草>白三叶>满天星；植物比根长与根-土复合体抗压性呈正相关，但没有显著相关性；土层深度与土体的抗压性呈显著正相关（P＜0.05）；根系含量和土层深度是土体崩解速率的主要影响因子，随土层深度的增加，崩解速率降低，无根土的崩解速率均大于有根土，土壤中根系比根长和崩解速率呈显著线性负相关（P＜0.05）；不同植物抗压强度基本表现为麦冬>黑麦草>白三叶>满天星；崩解速率表现为麦冬>黑麦草>白三叶>满天星。结果表明，麦冬和黑麦草护坡能力和适应性更强，可在实际园林工程中应用。
- Abstract:
- Four kinds of herbaceous plants widespreading in bare slope of Sichuan were studied,in order to explore the distribution and mechanical properties of herbaceous plant roots for slope protection.The root distribution and mechanical indicators of tensile,compressive,annti-disintegration and so on were measured.The results showed that the root biomass in 0-30 cm soil profile appeared the rule of Dwarf lilyturf>Lolium perenne>Trifolium repens>Gypsophila repens,and mainly concentrated in 0-10 cm soil layer.The root stress ordered Dwarf lilyturf>Lolium perenne>Trifolium repens>Gypsophila repens,there was a significantly negatively related and the power function relationship between tensile strength and root diameter,and R2 was more than 0.900 0 (P＜0.05),while there was a same change trend in tensile strength and root diameter which showed Dwarf lilyturf>Lolium perenne>Trifolium repens>Gypsophila repens.Tensile strength had a significantly negatively related to the diameter (P＜0.001) with R2 was -0.856 9,-0.998 5,-0.996 3,-0.923 4.Compressive strength of the four plants showed Dwarf lilyturf>Lolium perenne>Trifolium repens>Gypsophila repens,there was no significant difference between specific root length and compressive strength,and positive related to soil depth (P＜0.05).Soil depth and root content in the soil were the two key factors of impacting soil disintegration rate,soil disintegration rate reduced with increasing soil depth,and disintegration rate of no root soil was greater than the root soil,the root length and disintegration rate in the soil was significantly negatively correlated,compressive strength of the four plants showed Dwarf lilyturf>Lolium perenne>Trifolium repens>Gypsophila repens. In summary,slope protection ability of the gramineae was better.
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备注/Memo
作者简介：马海天才（1963-），男，彝族，四川甘洛人，硕士，高级工程师，研究方向为园林生理生态学。E-mail：MHTcai@126.com.基金项目：四川省教育厅资助项目（15ZD0370）。收稿日期：2018-03-12