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首页> 外文期刊>Journal of Arboriculture >A survey to determine the leaf nitrogen concentrations of 25 landscape tree species.
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A survey to determine the leaf nitrogen concentrations of 25 landscape tree species.

机译：确定25种景观树种叶片氮含量的调查。

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摘要

A survey was conducted to determine the concentrations of leaf nitrogen in 25 landscape tree species. Leaf samples were taken from mature, healthy trees in the landscape and analysed for percent (total) nitrogen. Concentrations ranged from 1.0% (dryweight basis) for deodar cedar (Cedrus deodara) and Southern magnolia (Magnolia grandiflora) to 3.6% for white mulberry (Morus alba). The leaf nitrogen levels determined by the current study were compared to two other published surveys. From a practicalstandpoint, the list of tree species and their corresponding minimum leaf nitrogen values from visually healthy trees will allow arborists and landscape maintenance professionals to more effectively use leaf analysis for diagnosing nitrogen deficiency.The information can also be used for designing fertilizer programmes, much as critical leaf nutrient level guides are currently used in the fruit and nut tree industries.
机译：进行了一项调查以确定25种景观树种中叶氮的浓度。叶片样品取自景观中成熟，健康的树木，并分析了氮含量（总氮）。浓度范围从雪松（Cedrus deodara）和南方木兰（Magnolia grandiflora）的1.0％（以干重计）到白桑树（Morus alba）的3.6％。将当前研究确定的叶氮水平与其他两项已发表的调查进行了比较。从实践的角度来看，树种的清单及其在视觉上健康的树木中对应的最低叶氮值将使树木学家和景观维护专业人士能够更有效地利用叶分析来诊断氮缺乏症。这些信息还可以用于设计肥料方案，很多作为关键的叶片营养水平指南，目前在果树和坚果树行业中使用。

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