Abstract In the United States, urban forests represent 35% of all urban land cover, and deliver benefits to nearly two-thirds of the population. As global urban populations continue to rise, however, redevelopment is continually reported as a major factor in reduced canopy cover. While urban trees provide us with measurable benefits when adequately maintained, their costs when not cared for remains poorly understood. In order to safeguard the benefits that urban forests provide, municipalities have begun to introduce ordinances with the intention to protect and manage trees within their community. The aim of this study was to better understand the condition and survival outcomes of residential trees intended to be preserved through a municipal tree preservation ordinance. The results of this study found that a comprehensive tree preservation ordinance can successfully protect tree and soil health during and after residential development occurs. This is evident through an overall preservation rate of nearly 75%, having found no correlation between proximity to newly developed foundation and observed tree condition or mortality, and the discovery of healthy soil compaction levels within tree protection areas and the critical root zones of preserved trees. Collaborative research as demonstrated by this project can help both academics and professionals gain a better understanding of how to best manage their own urban forests.

中文翻译：

---

施工期间的树木保护：综合市政树木条例的评估

摘要 在美国，城市森林占所有城市土地覆盖的 35%，为近三分之二的人口带来好处。然而，随着全球城市人口的持续增加，重新开发不断被报告为树冠覆盖减少的主要因素。虽然城市树木在得到充分维护的情况下为我们提供了可衡量的好处，但人们对其不加以照顾时的成本仍然知之甚少。为了保护城市森林带来的好处，市政当局已经开始出台旨在保护和管理社区内树木的法令。本研究的目的是更好地了解拟通过市政树木保护条例保护的住宅树木的状况和生存结果。这项研究的结果发现，一项全面的树木保护条例可以在住宅开发期间和之后成功保护树木和土壤健康。近 75% 的整体保存率证明了这一点，发现靠近新开发的基础与观察到的树木状况或死亡率之间没有相关性，并且在树木保护区和保存树木的关键根区发现健康的土壤压实水平. 该项目所展示的合作研究可以帮助学者和专业人士更好地了解如何最好地管理自己的城市森林。发现靠近新开发的地基与观察到的树木状况或死亡率之间没有相关性，在树木保护区和保存树木的关键根区发现健康的土壤压实水平。该项目所展示的合作研究可以帮助学者和专业人士更好地了解如何最好地管理自己的城市森林。发现靠近新开发的地基与观察到的树木状况或死亡率之间没有相关性，在树木保护区和保存树木的关键根区发现健康的土壤压实水平。该项目所展示的合作研究可以帮助学者和专业人士更好地了解如何最好地管理自己的城市森林。