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长三角地区城镇化对耕地多功能供需匹配的影响

Impact of urbanization on the supply- demand matching of multiple cultivated land functions in the Yangtze River Delta region

  • 摘要: 耕地利用的可持续性已经成为中国实现可持续发展目标的重大挑战,厘清城镇化发展对耕地多功能供需匹配的影响对于实现耕地系统可持续利用具有重要意义。研究以长三角地区作为研究区,定量测度了2000—2023年区域粮食生产、水源涵养、碳固存、生境质量、景观文化等5项耕地多功能的供给水平和需求水平,揭示不同类型耕地功能供需匹配的时空演化特征,探析不同类型城镇化对耕地多功能供需匹配的影响。结果表明:1)研究期间,长三角地区耕地的粮食供给量和水源供给量分别表现为“北高南低”和“南高北低”,碳固存量总体呈现显著增长态势,生境质量和景观文化供给指数高值区分别分布在长三角西南部地区和江苏东部沿海地区,各项耕地多功能需求水平随城市规模增大而递增,并且在上海市、苏南地区和浙东地区呈现不断增强态势;2)小城市各项耕地功能总体处于供给盈余状态,超大城市和特大城市各项耕地功能总体处于供给短缺状态,其中上海市和苏南地区各项耕地功能表现出明显增强的供给短缺;3)社会城镇化对粮食生产供需匹配的影响最大,经济城镇化对碳固存和景观文化供需匹配的影响程度高于其他类型城镇化,空间城镇化和经济城镇化对生境质量供需匹配产生更高的影响,不同类型城镇化交互作用对耕地多功能供需匹配的影响程度均高于单一类型城镇化的影响程度。研究旨在为推动区域新型城镇化高质量发展和耕地系统可持续管理提供决策依据。

     

    Abstract: The sustainability of cultivated land use has become a major challenge for China in achieving its sustainable development goals. Clarifying the impact of urbanization on the supply-demand matching of multiple cultivated land functions (CLFs) is of great significance for achieving sustainable utilization of the cultivated land system. This study takes the Yangtze River Delta (YRD) region as the study area, quantitatively measures the supply and demand levels of five CLFs, including grain production, water conservation, carbon sequestration, habitat quality, and landscape culture from 2000 to 2023. We also revealed the spatiotemporal evolution characteristics of supply-demand matching for different types of CLFs and explored the impact of different types of urbanization on the supply-demand matching of these CLFs. The results showed that: ① During the study period, the grain supply and water supply of cultivated land exhibited higher in the north and lower in the south and higher in the south and lower in the north, respectively in the YRD region. Carbon sequestration showed a significant overall growth trend in the region. The high-value areas of habitat quality and landscape culture supplies were distributed in the southwest region of the YRD region and the eastern coastal region of Jiangsu, respectively. The demand levels for various CLFs have increased with the expansion of city size, and showed continuous strengthening trends in Shanghai, southern Jiangsu, and eastern Zhejiang; ② Small cities generally had a surplus supply of various CLFs, while megacities and supercities generally had a shortage of supply for various CLFs. Shanghai and southern Jiangsu showed significantly enhanced supply shortages for various CLFs; ③ Social urbanization has the greatest impact on the supply-demand matching of grain production, while economic urbanization has a higher impact on the supply-demand matching of carbon sequestration and landscape culture than other types of urbanization. Spatial urbanization and economic urbanization have higher impacts on the supply-demand matching of habitat quality. The interaction of different types of urbanization has a higher impact on the supply-demand matching of multiple CLFs than the impact of a single type of urbanization. This study aims to provide decision-making basis for promoting high-quality development of new-type urbanization and sustainable management of the cultivated land system in the region.

     

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