Rising temperatures will make Miami’s street life even more exotic

IF 6 2区 环境科学与生态学 Q1 ENVIRONMENTAL STUDIES Urban Forestry & Urban Greening Pub Date : 2024-09-04 DOI:10.1016/j.ufug.2024.128502
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Abstract

Species in humid, tropical regions frequently experience dangerously high heat. The danger of high temperatures is especially pronounced in cities due to the urban heat island effect. Trees can greatly reduce surface temperatures and mitigate the urban heat island effect through evapotranspiration and by reflecting solar radiation before it is absorbed by impervious surfaces. However, trees may also be physiologically susceptible to the effects of climate change as high temperatures exceed their physiological limits. In this study, we assessed how the urban tree community in subtropical Miami (Florida, USA) will be impacted by climate warming and how impacts will differ between native and exotic tree species. We calculated the thermal safety margin (TSM) in Miami for each of 235 tree species as the difference between the maximum temperature experienced by a species within its range and the current and future (2100) projected maximum temperature in the city. We also combined TSMs, a metric of resilience to heat, with each species’ drought, wind, and salt tolerance to identify species that are resilient to multiple relevant stressors. We found that by 2100 Miami will be too hot for 16–41 % of the tree species currently planted in the city, depending on the climate change scenario. Native tree species will be disproportionately impacted compared to exotics, likely because most exotic species originate in the tropics, whereas most species native to Miami are primarily subtropical or temperate. The species that are more resilient to multiple stressors include mostly native species, several of which are ideal shade trees. Urban greening initiatives should carefully consider tree plantings to optimize the long-term health of urban tree communities and the services that they can provide to cities in the future.

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气温升高将使迈阿密的街头生活更具异国情调
潮湿热带地区的物种经常经历危险的高温。由于城市热岛效应,高温对城市的危害尤为明显。树木可以通过蒸腾作用和反射太阳辐射,在太阳辐射被不透水表面吸收之前大大降低地表温度,缓解城市热岛效应。然而,由于高温超过了树木的生理极限,树木在生理上也很容易受到气候变化的影响。在这项研究中,我们评估了亚热带迈阿密(美国佛罗里达州)的城市树木群落将如何受到气候变暖的影响,以及本地树种和外来树种受到的影响有何不同。我们计算了迈阿密 235 个树种的热安全系数(TSM),即一个树种在其分布范围内经历的最高温度与该城市当前和未来(2100 年)预计最高温度之间的差值。我们还将TSM(一种抗热指标)与每个物种的抗旱、抗风和抗盐能力结合起来,以确定哪些物种能够抵御多种相关压力。我们发现,根据不同的气候变化情景,到2100年,迈阿密将有16-41%的树种无法适应目前在该市种植的高温天气。与外来树种相比,本地树种将受到不成比例的影响,这可能是因为大多数外来树种原产于热带地区,而迈阿密的大多数本地树种主要是亚热带或温带树种。对多种压力具有较强适应能力的树种主要包括本地树种,其中有几种是理想的遮荫树。城市绿化活动应仔细考虑植树问题,以优化城市树木群落的长期健康及其未来为城市提供的服务。
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来源期刊
CiteScore
11.70
自引率
12.50%
发文量
289
审稿时长
70 days
期刊介绍: Urban Forestry and Urban Greening is a refereed, international journal aimed at presenting high-quality research with urban and peri-urban woody and non-woody vegetation and its use, planning, design, establishment and management as its main topics. Urban Forestry and Urban Greening concentrates on all tree-dominated (as joint together in the urban forest) as well as other green resources in and around urban areas, such as woodlands, public and private urban parks and gardens, urban nature areas, street tree and square plantations, botanical gardens and cemeteries. The journal welcomes basic and applied research papers, as well as review papers and short communications. Contributions should focus on one or more of the following aspects: -Form and functions of urban forests and other vegetation, including aspects of urban ecology. -Policy-making, planning and design related to urban forests and other vegetation. -Selection and establishment of tree resources and other vegetation for urban environments. -Management of urban forests and other vegetation. Original contributions of a high academic standard are invited from a wide range of disciplines and fields, including forestry, biology, horticulture, arboriculture, landscape ecology, pathology, soil science, hydrology, landscape architecture, landscape planning, urban planning and design, economics, sociology, environmental psychology, public health, and education.
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