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Linking Urban Tree Cover Change and Local History in a Post-Industrial City
Land ( IF 3.905 ) Pub Date : 2021-04-12 , DOI: 10.3390/land10040403
Lara Roman , Indigo Catton , Eric Greenfield , Hamil Pearsall , Theodore Eisenman , Jason Henning

Municipal leaders are pursuing ambitious goals to increase urban tree canopy (UTC), but there is little understanding of the pace and socioecological drivers of UTC change. We analyzed land cover change in Philadelphia, Pennsylvania (United States) from 1970–2010 to examine the impacts of post-industrial processes on UTC. We interpreted land cover classes using aerial imagery and assessed historical context using archival newspapers, agency reports, and local historical scholarship. There was a citywide UTC increase of +4.3 percentage points. Substantial UTC gains occurred in protected open spaces related to both purposeful planting and unintentional forest emergence due to lack of maintenance, with the latter phenomenon well-documented in other cities located in forested biomes. Compared to developed lands, UTC was more persistent in protected open spaces. Some neighborhoods experienced substantial UTC gains, including quasi-suburban areas and depopulated low-income communities; the latter also experienced decreasing building cover. We identified key processes that drove UTC increases, and which imposed legacies on current UTC patterns: urban renewal, urban greening initiatives, quasi-suburban developments, and (dis)investments in parks. Our study demonstrates the socioecological dynamism of intra-city land cover changes at multi-decadal time scales and the crucial role of local historical context in the interpretation of UTC change.

中文翻译:

将后工业城市的城市树木覆盖变化与当地历史联系起来

市政领导人正在追求雄心勃勃的目标,以增加城市树冠(UTC),但对UTC变更的步伐和社会生态驱动因素知之甚少。我们分析了1970-2010年美国宾夕法尼亚州费城的土地覆被变化,以研究工业化后过程对UTC的影响。我们使用航空影像解释了土地覆盖类别,并使用档案报纸,代理商报告和当地历史奖学金评估了历史背景。全市UTC增长了+4.3个百分点。由于缺乏维护,在有目的的种植和无意的森林出现相关的受保护开放空间中,UTC取得了可观的收益,后一种现象在有森林生物群落的其他城市中得到了充分证明。与发达土地相比,UTC在受保护的开放空间中更具持久性。一些社区经历了UTC的大幅增长,包括准郊区地区和人口稀少的低收入社区;后者的建筑面积也有所减少。我们确定了导致UTC增长的关键过程,并对当前UTC模式施加了遗产:城市更新,城市绿化计划,准郊区开发以及公园的(不)投资。我们的研究表明,在数十年的时间尺度上,城市内部土地覆盖变化的社会生态学活力,以及当地历史背景在UTC变化解释中的关键作用。我们确定了导致UTC增长的关键过程,并对当前UTC模式施加了遗产:城市更新,城市绿化计划,准郊区开发以及公园的(不)投资。我们的研究表明,在数十年的时间尺度上,城市内部土地覆盖变化的社会生态学活力,以及当地历史背景在UTC变化解释中的关键作用。我们确定了导致UTC增长的关键过程,并对当前UTC模式施加了遗产:城市更新,城市绿化计划,准郊区开发以及公园的(不)投资。我们的研究表明,在数十年的时间尺度上,城市内部土地覆盖变化的社会生态学活力,以及当地历史背景在UTC变化解释中的关键作用。
更新日期:2021-04-12
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