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首页> 外文期刊>Journal of Arboriculture >A methodology for assessing and managing biodiversity in street tree populations: a case study.
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A methodology for assessing and managing biodiversity in street tree populations: a case study.

机译：评估和管理街头树木种群生物多样性的方法：一个案例研究。

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摘要

As a consequence of compacted soils, impervious surfaces, heat irradiation, pollution, and other stresses, urban trees have an average expected service life of 10 to 25 years. Most US public agency budgets for street tree replacement and maintenanceare declining. Public tree managers need tools to prolong the service life of street tree populations while reducing the need for maintenance activities (including pruning and pest management). Many jurisdictions rely on "approved tree" lists, but theseoften contain large numbers of species generally unavailable in a given area, and filters for diversity are seldom part of these documents. To avoid catastrophic losses and pest outbreaks associated with virtual monocultures, the Maryland Department ofNatural Resources has developed a methodology for assessing biodiversity in existing populations. An inventory is taken. The results of the inventory are broken down taxonomically by family, genus, and species. The results are then analysed, with targetlevels established as follows: no more than 30% of any one family, 20% of one genus, or 10% of one species should be present. Based on the results of the assessment, recommendations are made as a tool for use in future replacement contracts to bring about the desired species composition.
机译：由于土壤密实，不透水的表面，热辐射，污染和其他压力，城市树木的平均预期使用寿命为10至25年。美国大多数公共机构用于街道树木更换和维护的预算都在下降。公共树木管理员需要工具来延长街头树木的使用寿命，同时减少维护活动（包括修剪和病虫害管理）的需求。许多司法管辖区都依靠“批准的树木”清单，但是这些清单通常包含在给定区域通常不可用的大量物种，因此这些文件很少包含用于多样性的过滤器。为避免与虚拟单一栽培有关的灾难性损失和病虫害爆发，马里兰州自然资源部开发了一种评估现有种群生物多样性的方法。已盘点。清单的结果按科，属和种按分类分类。然后对结果进行分析，确定的目标水平如下：任何一个家族的总数不超过30％，一个属的20％或一种物种的不超过10％。根据评估结果，提出建议，作为将来替换合同中使用的工具，以实现所需的物种组成。

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