气候变化领域集成服务门户(CCPortal): The occupation of cropland by global urban expansion from 1992 to 2016 and its implications

CCPortal

DOI	10.1088/1748-9326/ab858c
	The occupation of cropland by global urban expansion from 1992 to 2016 and its implications
	Huang Q.; Liu Z.; He C.; Gou S.; Bai Y.; Wang Y.; Shen M.
发表日期	2020
ISSN	17489318
卷号	15 期号:8
英文摘要	Large-scale urban expansion worldwide has exerted great impacts on cropland and its net primary productivity (NPP), which can affect whether food security and sustainable development goals will be met at global and local scales. Although important, the impacts at the global scale over the last 25 years remain unclear. Based on the latest long-term dynamic urban expansion data, this study analyzed global urban expansion and its impacts on cropland NPP from 1992 to 2016 at multiple scales. The results showed that the expansion of urban land occupied a total of 159 170 km2 of cropland, accounting for 45.9% of the total expanded urban area. The cropland NPP decreased by 58.71 (56.52 ∼ 59.81, 95% confidence interval) TgC as a result of urban expansion, which represents approximately 0.42% (0.40% ∼ 0.43%) of the multiyear average of total cropland NPP from 2000 to 2015. If the cropland NPP losses were converted to the grain production (i.e. 1.44 × 107 tons), it is equivalent to the minimum annual food intake demands for at least 36 million people. More importantly, urban expansion is exacerbating the risk of food security in developing countries in Asia and Africa, such as China, Vietnam and Egypt. In the future, these countries should balance urban expansion with cropland protection by strictly restricting the occupation of cropland and encouraging smart urban growth. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	food security; land use change; sustainable development goals; urban expansion; urban sustainability
语种	英语
scopus关键词	Developing countries; Ecosystems; Expansion; Food supply; Confidence interval; Food security; Global scale; Grain production; Long term dynamics; Multiple scale; Net primary productivity; Urban expansion; Urban growth; agricultural land; food security; land management; occupation; primary production; sustainable development; urban growth; urbanization
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153860
作者单位	Center for Human-Environment System Sustainability (CHESS), State Key Laboratory of Earth Surface Processes and Resource Ecology (ESPRE), Beijing Normal University, Beijing, 100875, China; School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China; Institute of Land Surface System and Sustainable Development, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China
推荐引用方式 GB/T 7714	Huang Q.,Liu Z.,He C.,et al. The occupation of cropland by global urban expansion from 1992 to 2016 and its implications[J],2020,15(8).
APA	Huang Q..,Liu Z..,He C..,Gou S..,Bai Y..,...&Shen M..(2020).The occupation of cropland by global urban expansion from 1992 to 2016 and its implications.Environmental Research Letters,15(8).
MLA	Huang Q.,et al."The occupation of cropland by global urban expansion from 1992 to 2016 and its implications".Environmental Research Letters 15.8(2020).