Raveling the nexus between urban expansion and cropland loss in China
Topics: Land Use and Land Cover Change
, China
, Economic Geography
Keywords: land use change; urbanization; cropland loss; Environmental Kuznets Curve; China
Session Type: Virtual Guided Poster Abstract
Day: Sunday
Session Start / End Time: 2/27/2022 09:40 AM (Eastern Time (US & Canada)) - 2/27/2022 11:00 AM (Eastern Time (US & Canada))
Room: Virtual 1
Authors:
Ying Tu, Department of Earth System Science, Tsinghua University
Bin Chen, Division of Landscape Architecture, Faculty of Architecture, The University of Hong Kong
Bing Xu, Department of Earth System Science, Tsinghua University
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Abstract
The dramatic expansion of urban lands has caused widespread cropland losses in China, yet little evidence is given on the progress of such transformation spatial-temporal explicitly. Here, using China’s annual land cover datasets, we analyzed the extent of cropland loss resulting from urban expansion and explored its relationship with economic growth through panel data regressions. By combing the future urban land expansion datasets, we further estimated the pressure of potential cropland loss under five shared socioeconomic pathways. Results showed urban expansion had directly led to a loss of 12 Mha croplands during 1990-2019. Nearly 84% of newly urban lands occurred on croplands, with higher-level cities experiencing more severe and direct losses. There exists an inverted U-shape relationship between cropland-urban land conversion and economic factors. Although this implies a decline of the dependency of urban expansion on cropland loss in the future, urban expansion is expected to occupy 3.9-4.9 Mha existing croplands by 2050. These findings highlight the important role of land-use transition and adaptive planning polices in ensuring food security and achieving sustainable development goals.
Raveling the nexus between urban expansion and cropland loss in China
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Virtual Guided Poster Abstract
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