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首页> 外文期刊>Acta Horticulturae >Ten-year performance of elms in the National Elm Trial
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Ten-year performance of elms in the National Elm Trial

机译：在国家榆树审判中榆树的十年表现

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摘要

Ulmus americana (American elm) was an important urban tree in North America prior to the introduction of the Dutch elm disease {Ophiostoma ulmi and 0. novo-ulmi) pathogen in 1930. Subsequently, urban and community forests were devastated by the loss of the large canopies. Disease tolerant elms [Ulmus spp.) of various species were later developed; however, consumer acceptance of these trees was slow. The goal of the National Elm Trial was to evaluate newer cultivars of elm across the United States. Trees were monitored for survival and growth for 7 to 10 years at 16 different locations. 'Morton' elm had >90% survival, while 13 cultivars averaged 70 to 90%, and five cultivars ranged from 25 to 69% survival. Trunk diameter growth by location ranged from 0.5 cm year1 at Colorado to more than 2.0 cm year1 at Iowa. By taxa, trunk diameter growth ranged from a low of 'JFS Bieberich' elm (0.7 cm year1) to a high of 'New Horizon' elm (1.7 cm year1). The fastest height growth was found with the American elmcultivars 'New Harmony' and 'Princeton' (0.63 and 0.61 m year1, respectively).
机译：Ulmus Americana（美国榆树）在引入荷兰榆树病（Ophiostoma Ulmi和0.Novo-Ulmi）病原体之前是北美的重要城市树，于1930年。随后，城市和社区森林被失去损失了大檐篷。疾病耐受性榆树[Ulmus SPP。）后来开发了各种物种;然而，消费者接受这些树木很慢。国家榆木审判的目标是评估美国榆树的新品种。在16个不同的位置监测树木以获得生存和生长7至10年。 '莫尔顿榆树生存率> 90％，而13种品种平均为70％至90％，5种品种的生存率为25至69％。主干直径的增长范围从科罗拉多州0.5厘米左右到爱荷华州的2.0厘米以上。通过分类群，中继线直径的增长范围从“JFS Bieberich”榆树（0.7厘米左右）到高度'新地平线'榆树（1.7厘米1年）。最快的高度增长与美国Elmcultivars的新和平'和“普林斯顿”（分别为0.63和0.61米左右）。

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