Wen Xinjian, Yang Fuying, Chen Jiangping, Tu Ying, Wang Haiyun, Chen Zhanpeng, Dong Ting, Xu Gang
Institute of Land Resources Surveying and Mapping of Guangdong Province, Guangzhou, 510000, China.
School of Resource and Environmental Sciences, Wuhan University, Wuhan, 430079, China.
Heliyon. 2024 Apr 30;10(9):e30548. doi: 10.1016/j.heliyon.2024.e30548. eCollection 2024 May 15.
Urban expansion often occurs at the expense of cropland loss, posing challenges to sustainable urban growth and food security. However, detailed investigations into urban expansion and cropland loss remain limited, particularly in regions with varying levels of urbanization. Here, we take Guangdong Province, China, as a case study to exemplify how urban expansion affects cropland using remotely sensed land use products. We adopted geospatial analysis, correlation indicators, and landscape metrics to uncover their spatial relationships at 10-m spatial resolutions. Results showed that urban areas increased by 6335 km while cropland decreased by 3780 km from 2017 to 2022. Notably, 41 % of newly expanded urban areas were from croplands, and 45 % of lost croplands were converted to urban areas. Western Guangdong experienced the largest extent of urban expansion and cropland loss, emerging as a hotspot region in recent years. Additionally, our analysis observed the increasing compactness of urban areas and the growing fragmentation of cropland landscapes over time. These findings shed light on the intricate dynamics between urban expansion and cropland loss in rapidly urbanizing regions, which provide valuable insights for sustainable urban development, agricultural practice, and land management in the future.
城市扩张往往以牺牲耕地流失为代价，给城市可持续发展和粮食安全带来挑战。然而，对城市扩张和耕地流失的详细调查仍然有限，特别是在城市化水平不同的地区。在此，我们以中国广东省为例，通过遥感土地利用产品来阐明城市扩张如何影响耕地。我们采用地理空间分析、相关指标和景观指标，在10米空间分辨率下揭示它们的空间关系。结果表明，2017年至2022年期间，城市面积增加了6335平方公里，而耕地面积减少了3780平方公里。值得注意的是，新扩张的城市面积中有41%来自耕地，而流失的耕地中有45%转变为城市用地。粤西地区城市扩张和耕地流失的程度最大，近年来成为一个热点地区。此外，我们的分析还发现，随着时间的推移，城市地区的紧凑度在增加，而耕地景观的破碎化程度也在加剧。这些发现揭示了快速城市化地区城市扩张与耕地流失之间的复杂动态关系，为未来的城市可持续发展、农业实践和土地管理提供了宝贵的见解。
