Green balance in urban areas as an indicator for policy support: a multi-level application

IF 1.8 Q3 ECOLOGY One Ecosystem Pub Date : 2022-03-11 DOI:10.3897/oneeco.7.e72685
G. Zulian, Federica Marando, L. Mentaschi, Claudia Alzetta, B. Wilk, J. Maes
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引用次数: 3

Abstract

Green spaces are increasingly recognised as key elements in enhancing urban resilience as they provide several ecosystem services. Therefore, their implementation and monitoring in cities are crucial to meet sustainability targets. In this paper, we provide a methodology to compute an indicator that assesses changes in vegetation cover within Urban Green Infrastructure (UGI). Such an indicator is adopted as one of the indicators for reporting on the key area “nature and biodiversity” in the Green City Accord (GCA). In the first section, the key steps to derive the indicator are described and a script, which computes the trends in vegetation cover using Google Earth Engine (GEE), is provided. The second section describes the application of the indicator in a multi-scale, policy-orientated perspective. The analysis has been carried out in 696 European Functional Urban Areas (FUAs), considering changes in vegetation cover inside UGI between 1996 and 2018. Results were analysed for the EU and the United Kingdom. The Municipality of Padua (Italy) is used as a case study to illustrate the results at the local level. Over the last 22 years, a slight upward trend characterised the vegetation growth within UGI in European FUAs. Within core cities and densily built-upcommuting zones, the trend was stable; in non-densely built-up areas, an upward trend was recorded. Vegetation cover in UGI has been relatively stable in European cities. However, a negative balance between abrupt changes in greening and browning has been recorded, affecting most parts of European cities (75% of core cities and 77% of commuting zones in densely built-up areas). This still indicates ongoing land take with no compensation of green spaces that are lost to artificial areas. Focusing on the FUA of Padua, a downward trend was observed in 33.3% and 12.9% of UGI in densely built-up and not-densely built-up areas, respectively. Within the FUA of Padua, most municipalities are characterised by a negative balance between abrupt greening and browning, both in non-densely built-up and densely built-up areas. This approach complements traditional metrics, such as the extent of UGI or tree canopy cover, by providing a valuable measure of condition of urban ecosystems and an instrument to monitor the impact of land take.
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城市地区绿色平衡作为政策支持指标的多层次应用
绿地越来越被认为是增强城市韧性的关键因素,因为它们提供了多种生态系统服务。因此,它们在城市中的实施和监测对于实现可持续性目标至关重要。在本文中,我们提供了一种计算指标的方法,该指标用于评估城市绿色基础设施(UGI)内植被覆盖的变化。这一指标被采纳为《绿色城市协议》中关于“自然和生物多样性”关键领域的报告指标之一。在第一节中,描述了导出指标的关键步骤,并提供了一个脚本,该脚本使用谷歌地球引擎(GEE)计算植被覆盖的趋势。第二节从多尺度、政策导向的角度介绍了该指标的应用。该分析已在696个欧洲功能城区(FUA)进行,考虑到1996年至2018年间UGI内植被覆盖的变化。对欧盟和联合王国的结果进行了分析。帕多瓦市(意大利)被用作案例研究,以说明地方一级的结果。在过去的22年里,欧洲FUA UGI内的植被生长呈轻微上升趋势。在核心城市和密集建设的通勤区内,这一趋势是稳定的;在非密集建筑区,有上升趋势。在欧洲城市,UGI的植被覆盖相对稳定。然而,绿化和褐变的突然变化之间存在负平衡,影响了欧洲大部分城市(75%的核心城市和77%的密集建成区通勤区)。这仍然表明正在进行的土地征用没有补偿因人工区域而损失的绿地。以帕多瓦的FUA为重点,在人口密集和非人口密集地区,分别有33.3%和12.9%的UGI呈下降趋势。在帕多瓦的FUA中,无论是在非密集建成区还是密集建成区,大多数市政当局的特点都是突然绿化和褐变之间的负平衡。这种方法通过提供城市生态系统状况的有价值的衡量标准和监测土地征用影响的工具,补充了传统指标,如UGI或树冠覆盖的程度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
One Ecosystem
One Ecosystem Environmental Science-Nature and Landscape Conservation
CiteScore
4.60
自引率
0.00%
发文量
26
审稿时长
12 weeks
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