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首页> 外文期刊>Journal of Arboriculture >Root barrier and extension casing effects on Chinese hackberry.
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Root barrier and extension casing effects on Chinese hackberry.

机译：根障和扩展套管对中国朴树的影响。

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In California, repairing sidewalk damage associated with tree roots exceeds dollar 62 million annually. Efforts to reduce sidewalk damage have provided street tree managers with a variety of root barrier products. In this study, 3 types of root barriers were installed and evaluated to determine whether (1) internal vertical ribs prevented circling roots and (2) root development would be significantly reduced in the top 30 cm of soil. The 3 barriers tested included: (1) a modified production container, partially left in place when planted (extension casing); (2) a commercial product with vertical ribs spaced 15 cm apart, intended to prevent circling roots; and (3) a commercial product with vertical ribs spaced 12.5 cm apart. Root diameter, depth, and dryweight were measured for Chinese hackberry (Celtis sinensis) planted and grown for 3 years with and without root barriers. The extension casing reduced root biomass in the top 33 cm of soil by 50% compared to trees without barriers (controls). Mean rootdiameter of the 6 largest roots outside of the casing was also significantly smaller. Mean root diameters and biomass of controls were similar to those for the 2 commercial barriers. Roots on the trees with root barriers escaped beyond the barrier wallsthen grew upwards to depths similar to the controls (37 cm). Although casings reduced total root biomass and diameter, they appeared to encourage circling root growth. Circling was diminished when commercial barriers with internal vertical ribs were used. Mean top growth was similar among treatments.
机译：在加利福尼亚，修复与树根相关的人行道损坏每年超过6,200万美元。减少人行道损坏的努力为街边树的管理者提供了多种根防屏障产品。在这项研究中，安装并评估了3种类型的根系屏障，以确定（1）内部垂直肋骨是否阻止了根系旋转，以及（2）在表层30 cm以内根系发育是否会明显减少。测试的3个障碍包括：（1）改良的生产容器，种植时部分留在原处（扩展外壳）; （2）商业产品，其垂直肋骨间隔15厘米，旨在防止根部盘旋; （3）垂直肋间距为12.5厘米的商品。测量了在有无根障的情况下种植并生长3年的朴树（Celtis sinensis）的根径，深度和干重。与没有障碍物的树木（对照）相比，延长套管减少了土壤顶部33 cm根系生物量的50％。套管外6个最大根的平均根直径也显着较小。对照的平均根直径和生物量与两种商业屏障的平均直径和生物量相似。树木的根部障碍物的根部越过障碍物壁逃逸，然后向上生长至与对照相似的深度（37厘米）。尽管套管减少了根总生物量和直径，但它们似乎促进了盘根生长。当使用带有内部垂直肋的商业屏障时，减少了打圈。各治疗之间的平均最高增长相似。

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