Abstract
Vegetation degradation caused by rapid urban expansion is a pressing global challenge. Focusing on the Chinese Loess Plateau (CLP), we use satellite observations from 2000 to 2017 to evaluate the spatiotemporal pattern of urban expansion, and its imprint on vegetation across old urban, new urban, urban, non-urban areas as well as the entire urbanization intensity (UI) gradient (from 0 to 100%). We found a massive increase of urban impervious surface area (UISA) in the CLP from 2000 to 2017, and an uneven expansion of UISA at different urban agglomerations and cities. Less green were found in urban and new urban areas, while old urban and non-urban areas generally showed an improved greening pattern. In addition, the annual maximum EVI (EVImax) differences between urban and non-urban areas were − 0.0995 on average from 2000 to 2017. The Guanzhong Plain urban agglomeration (GPUA) witnessed the most significant EVImax differences (− 0.120), and the Ningxia Yanhuang urban agglomeration (NYUA) witnessed the lowest EVImax differences (− 0.012). The EVImax showed significantly decreased trends along the entire spectrum of urbanization gradient for 97.4% (38 of 39) cities and five urban agglomerations. The most significant decrease was found in the GUPA (slope = − 0.0197/10a, p < 0.01), while the smallest drop was found in the NYUA (slope = − 0.011/10a, p < 0.01). This study offered a fundamental support for understanding the vegetation variation along the urban–rural gradient, which may help stakeholders to make better ecological management policies for urban vegetation in ecologically fragile areas.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- CLP:
-
Chinese Loess Plateau
- EVI:
-
Enhanced vegetation index
- EVImax :
-
Annual maximum EVI
- FROM-GLC:
-
Finer Resolution Observation and Monitoring-Global Land Cover
- GDP:
-
Gross domestic product
- GPP:
-
Gross primary production
- GPUA:
-
Guanzhong Plain urban agglomeration
- GR:
-
Growth rate
- HEUA:
-
Hubao EYu urban agglomeration
- JZUA:
-
Jinzhong urban agglomeration
- LXUA:
-
Lanxi urban agglomeration
- MODIS:
-
Moderate Resolution Imaging Spectroradiometer
- MVC:
-
Maximum value composite
- NDVI:
-
Normalized difference vegetation index
- NPP:
-
Net primary production
- NTL:
-
Nighttime light
- NYUA:
-
Ningxia Yanhuang urban agglomeration
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Funding
The work was partially supported by the National Natural Science Foundation of China (No. 42171212, 41877523) and the Natural Science Foundation of Hebei Province (No. D2022402030).
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Anzhou Zhao proposed a newly idea about the exploration of the evolution of urbanization and ecological environment quality and their coupling coordination relationship. Xiaoqian Liu designed the experiments and carried them out. Zhoutao Zheng reviewed and edited this manuscript and helped with the collections of the data. Anzhou Zhao prepared the manuscript with contributions from all co-authors.
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Zhao, A., Liu, X. & Zheng, Z. Evaluation of urban expansion and the impacts on vegetation in Chinese Loess Plateau: a multi-scale study. Environ Sci Pollut Res 30, 6021–6032 (2023). https://doi.org/10.1007/s11356-022-22633-5
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DOI: https://doi.org/10.1007/s11356-022-22633-5