Global transfer of salinization on irrigated land: Complex network and endogenous structure
Global transfer of salinization on irrigated land: Complex network and endogenous structure
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DOI：
10.1016/j.jenvman.2023.117592
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发表时间：
2023-03-07
影响因子：
8.7
通讯作者：
Xia, Xiaohua
中科院分区：
文献类型：
--
作者：
Jia, Yuanxin;Wu, Jialu;Xia, Xiaohua
日益全球化加剧了通过全球供应链进行的土地再分配。区域间贸易不仅转移了土地，而且将土地退化的负面环境影响从一个区域转移到另一个区域。这项研究揭示了土地退化的转移，直接侧重于盐碱化，而以前的研究已经广泛评估了贸易中体现的土地资源。为了分析体现性流动交织下的经济体间关系，本研究结合复杂网络分析和投入产出方法，观察转移支付系统的内生结构。通过关注作物产量高于旱地耕作的灌溉土地，我们提出了关于粮食安全和适当灌溉的政策建议。定量分析结果表明，全球最终需求的盐碱灌溉土地总量分别为260978.23和424291.05平方公里。灌溉土地的盐渍化面积不仅是发达国家的进口，而且是中国大陆和印度等发展中大国的进口。巴基斯坦、阿富汗和土库曼斯坦受含盐影响的土地的出口是紧迫的问题，占全球净出口国总出口的近60%。实证结果还表明，由于农产品贸易的区域偏好，体现性转移网络具有三个群体的基本群落结构。
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 re-lationships 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.