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我国特有种东北百里香(Thymus mandschuricus)是节水抗旱的优良野生芳香型观花木本地被植物,在北方城市园林绿化及植被恢复方面具有广阔的应用前景,尤其是干旱地区。结合新地被种类推广应用的需求,以东北林业大学实验基地引种繁殖的东北百里香为试验材料,研究不同程度践踏强度对东北百里香的坪床理化性质的影响。结果显示,土壤紧实度随着践踏强度和践踏次数的增加而呈现上升趋势,中度和重度践踏5次后,土壤紧实度分别达到0.401和0.531 kp,相对于对照0.243 kp差异显著(P<0.05);土壤紧实度增加导致水分渗透下降,土壤含水量下降,土壤pH值增大;土壤养分(全氮、有效磷、速效钾)的含量呈下降的趋势,与对照相比差异达到显著差异水平(P<0.05),影响了植物生长和生物量的积累。矮生种东北百里香枝条柔韧性好,使其耐一定程度践踏,这不同于一般的木本地被植物。园林应用在不影响观赏性情况下,容许轻度践踏。本试验结果可为木本地被植物的推广应用提供理论与实践指导。
Thymus mandschuricus, a endemic species of endemic species in China, is an excellent wild aromatic ornamental flower native plant which is water-saving and drought-resistant. It has broad application prospect in the northern urban landscaping and vegetation restoration, especially in arid areas. According to the needs of new land being popularized and popularized by species, Northeast thyme introduced and propagated in experimental base of Northeast Forestry University was used as experimental material to study the effects of different trampling strength on the physical and chemical properties of northeastern thyme. The results showed that soil compaction increased with the increase of trampling strength and trampling times. After moderate and severe trampling, soil compaction reached 0.401 and 0.531 kp, respectively, compared with 0.243 kp (P <0.05). The increase of soil compaction led to the decrease of water infiltration and soil water content, and the increase of soil pH value. The content of soil nutrients (total nitrogen, available phosphorus and available potassium) showed a downward trend, which was different from the control Significant differences (P <0.05) affected plant growth and biomass accumulation. Dwarf Northeast thyme twig flexibility, good resistance to some trampling, which is different from the general wood native plants. Landscape applications do not affect the ornamental situation, allowing light trampling. The results of this experiment can provide theoretical and practical guidance for the popularization and application of wood native plants.