Faculty of Geography, Yunnan Normal University, Yunnan, 650500, China; GIS Technology Research Center of Resource and Environment in Western China, Ministry of Education, Yunnan Normal University, Yunnan, 650500, China.
Faculty of Geography, Yunnan Normal University, Yunnan, 650500, China; GIS Technology Research Center of Resource and Environment in Western China, Ministry of Education, Yunnan Normal University, Yunnan, 650500, China.
J Environ Manage. 2021 Aug 1;291:112598. doi: 10.1016/j.jenvman.2021.112598. Epub 2021 May 6.
Extensive urbanization leads to the degradation of vegetation, which aggravates the deterioration of many ecological environments. However, the research on the impact of urbanization on vegetation change mainly focuses on cities. But the research on urban agglomeration is relatively scarce. The impact of urbanization on vegetation is explored by quantifying the changes in construction land and normalized difference vegetation index (NDVI) in China's urban agglomerations from 2000 to 2018. Results showed that in China, 72.73% of the regional NDVI presented a significant increasing trend, and 2.05% of the regional NDVI presented a significant downward trend. Vegetation degradation occurred in urban areas, but there was an improvement in vegetation in the urban centers of 2000. In urban agglomerations, the shift of the center of gravity of construction land can affect the direction of the transfer of NDVI cold spots or hot spots. Urbanization intensity in most urban agglomerations was negatively correlated with vegetation cover and showed a downward trend along the intensity gradient. However, NDVI in areas covered by complete vegetation showed an upward trend. Based on these findings, we suggest that vegetation protection and restoration should be strengthened, and effective urban landscape planning should be carried out to promote vegetation greening.
城市化的发展会导致植被退化，从而加剧许多生态环境的恶化。然而，关于城市化对植被变化影响的研究主要集中在城市上，而对城市群的研究相对较少。本研究通过量化 2000—2018 年中国城市群建设用地和归一化植被指数（NDVI）的变化，探讨了城市化对植被的影响。结果表明，在中国，72.73%的区域 NDVI 呈显著增加趋势，2.05%的区域 NDVI 呈显著下降趋势。植被退化发生在城市地区，但 2000 年城市中心的植被状况有所改善。在城市群中，建设用地重心的转移会影响 NDVI 冷点或热点的转移方向。大多数城市群的城市化强度与植被覆盖呈负相关，并沿强度梯度呈下降趋势。然而，完全植被覆盖的区域的 NDVI 呈上升趋势。基于这些发现，我们建议加强植被保护和恢复，开展有效的城市景观规划，以促进植被绿化。
