Urban expansion and vegetation dynamics: The role of protected areas in preventing vegetation loss in a growing mega city

IF 6.5 1区 经济学 Q1 DEVELOPMENT STUDIES
Shahfahad , Swapan Talukdar , Mohd Waseem Naikoo , Atiqur Rahman
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引用次数: 0

Abstract

The decrease in vegetation cover due to urban expansion poses serious challenge to urban sustainability. Protected areas (PAs) are the most effective tools to prevent the loss of urban vegetation cover and to control urban expansion. Hence, this study aims to assess the importance of PAs in protecting urban vegetation and the urban expansion in the mega city of Delhi. For this, Landsat datasets were used for land use and land cover (LULC) mapping and then land cover change rate (LCCR) and land cover intensity (LCI) were calculated. For assessing urban expansion dynamics, mean landscape expansion index (MLEI) and the area-weighted LEI (AWLEI) were calculated. To evaluate the significance of PAs in protecting vegetation cover, kernel density estimation (KDE) was applied to assess the spatial variation and concentration of vegetation cover under different PAs. The result shows that urban expansion in Delhi was initially characterized by edge expansion during 1991–2001, followed by outlying expansion of built-up area during 2001–2021, while infilling of open and vegetated areas by built-up area was consistent during 1991–2021. Vegetation cover on the other hand, has followed a fluctuating trend in the city, but has overall it has declined from 13.36% to 9.30% during 1991–2021. The vegetation cover has declined significantly in eastern, northern, and western parts of Delhi but has increased significantly in central and southern parts, especially during 2001–21. This is because the central and southern parts of Delhi are well planned and have several PAs while the western, northern, and eastern parts of Delhi are unplanned regions and have only a few PAs. The KDE chart shows that the PAs have played an important role in protecting the vegetation cover in Delhi with R2 value > 0.70. Hence, this study suggests to give special emphasis on preservation and expansion of PAs in urban planning for the long-term conservation of urban vegetation cover and sustainable urban development.

城市扩张与植被动态:保护区在防止特大城市植被流失方面的作用
城市扩张导致植被减少,给城市的可持续发展带来严峻挑战。保护区是防止城市植被减少和控制城市扩张的最有效工具。因此,本研究旨在评估保护区在保护城市植被和德里特大城市扩张方面的重要性。为此,使用 Landsat 数据集绘制土地利用和土地覆被图,然后计算土地覆被变化率 (LCCR) 和土地覆被强度 (LCI)。为评估城市扩张动态,计算了平均景观扩张指数(MLEI)和面积加权景观扩张指数(AWLEI)。为了评估保护区在保护植被覆盖方面的重要性,应用核密度估计(KDE)来评估不同保护区下植被覆盖的空间变化和集中程度。结果表明,1991-2001 年期间,德里城市扩张的最初特征是边缘扩张,随后在 2001-2021 年期间,建成区外围扩张,而 1991-2021 年期间,建成区对空地和植被覆盖区的填充是一致的。另一方面,该市的植被覆盖率呈波动趋势,但在 1991-2021 年期间,植被覆盖率总体上从 13.36% 下降到 9.30%。德里东部、北部和西部的植被覆盖率明显下降,但中部和南部的植被覆盖率却明显上升,尤其是在 2001-21 年期间。这是因为德里的中部和南部地区规划完善,拥有多个保护区,而德里的西部、北部和东部地区属于未规划地区,只有少数几个保护区。KDE 图表显示,保护区在保护德里植被方面发挥了重要作用,R2 值为 0.70。因此,本研究建议在城市规划中特别重视保护区的保护和扩大,以实现城市植被的长期保护和城市的可持续发展。
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来源期刊
CiteScore
10.50
自引率
10.30%
发文量
151
审稿时长
38 days
期刊介绍: Habitat International is dedicated to the study of urban and rural human settlements: their planning, design, production and management. Its main focus is on urbanisation in its broadest sense in the developing world. However, increasingly the interrelationships and linkages between cities and towns in the developing and developed worlds are becoming apparent and solutions to the problems that result are urgently required. The economic, social, technological and political systems of the world are intertwined and changes in one region almost always affect other regions.
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