Jia Yuanxin, Wu Jialu, Cheng Mengyao, Xia Xiaohua
School of Applied Economics, Renmin University of China, Beijing, 100872, China.
School of Applied Economics, Renmin University of China, Beijing, 100872, China; Institute of China's Economic Reform and Development, Renmin University of China, Beijing, 100872, China.
J Environ Manage. 2023 Jun 15;336:117592. doi: 10.1016/j.jenvman.2023.117592. Epub 2023 Mar 7.
Increasing globalization intensifies land redistribution via global supply chains. Interregional trade not only transfers embodied land but also displaces the negative environmental impact of land degradation from one region to another. This study sheds light on land degradation transfer by focusing on salinization directly whereas previous studies have extensively assessed the land resource embodied in trade. To analyze the relationships among economies under interwoven embodied flows, this study integrates complex network analysis and input-output method to observe the endogenous structure of the transfer system. By focusing on irrigated land with higher crop yields than dryland farming, we make policy recommendations on food safety and proper irrigation. The results of the quantitative analysis show that the total amount of saline and sodic irrigated land embodied in global final demand are 260978.23 and 424291.05 square kilometers respectively. Salt-affected area of irrigated land is imported by not only developed countries but also large developing countries such as Mainland China and India. Exports of embodied salt-affected land in Pakistan, Afghanistan, and Turkmenistan are pressing issues, accounting for nearly 60% of total exports from net exporters worldwide. It is also demonstrated that embodied transfer network has a basic community structure of three groups due to regional preference in agricultural products trade.
日益加剧的全球化通过全球供应链加剧了土地再分配。区域间贸易不仅转移了隐含土地，还将土地退化的负面环境影响从一个地区转移到另一个地区。本研究直接聚焦于盐渍化，从而揭示土地退化转移情况，而此前的研究广泛评估了贸易中蕴含的土地资源。为了分析在相互交织的隐含流情况下各经济体之间的关系，本研究整合了复杂网络分析和投入产出方法，以观察转移系统的内生结构。通过关注作物产量高于旱地农业的灌溉土地，我们就食品安全和适当灌溉提出政策建议。定量分析结果表明，全球最终需求中蕴含的盐碱化灌溉土地总量分别为260978.23平方公里和424291.05平方公里。受盐影响的灌溉土地面积不仅被发达国家进口，中国大陆和印度等大型发展中国家也有进口。巴基斯坦、阿富汗和土库曼斯坦隐含受盐影响土地的出口是紧迫问题，占全球净出口国总出口量的近60%。研究还表明，由于农产品贸易中的区域偏好，隐含转移网络具有三个群体的基本社区结构。
