A critical role of the capital green belt in constraining urban sprawl and its fragmentation measurement

• DOI: 10.1016/j.landusepol.2024.107148
• Publication Date: 2024-03-23T22:26:03Z
• Authors: Liang Zhou; Yangchun Gong; David López-Carr; Chunlin Huang
• Keywords: Urban sprawl; Fragmentation; Green infrastructure; Green belt; Capital region

Urban green belts (UGBs), an important infrastructure of cities, have the functions constraining urban sprawl, which are great significance to green, resilient and sustainable development. However, it remains unclear how quantify effect UGBs on sprawl degree fragmentation after constrain sprawl. Here, we proposed a extraction method explore spatial evolution in rapidly expanding megacity Beijing from 2000 2020. We also quantitatively investigated role measured with help constraint assessment index, Annual Ring model, landscape pattern index. Results showed that: (1) Beijing's area "V"-shaped trend first decreasing then increasing 2020, 332.61 km2 303.41 2015, 369.42 is equivalent about 54 Olympic Forest Parks. (2) The UGBs' was characterized by gradual enhancement three periods 2005 boundary containment rate (BCR) 0.48, 0.22, 0.14 respectively. After construction newly planned 2005, speed 2010 2015 decreased 10.90%. (3) upward connectivity downward trend. patch density (PD) characterizing increased 17.22 31.60 aggregation index (AI) 86.92 79.73. research can provide reference for other similar sized cities UGB planning government decision-making.