全球粮食贸易伙伴多样化加剧了对冲击风险暴露的不平等
Diversification of global food trade partners increased inequalities in the exposure to shock risks
AI总结：
研究发现全球粮食贸易伙伴多样化加剧了对冲击风险的不平等暴露，谷物贸易更具韧性而动物脂肪贸易更脆弱。
摘要：
近期全球粮食贸易中断揭示了局部冲击如何演变成全球安全威胁。尽管粮食系统的抗压能力在很大程度上取决于其底层贸易网络，但很少有研究量化了其时间演变如何随着时间改变系统性脆弱性。本文评估了从1986年到2022年全球连通性变化如何塑造对生产冲击的响应。利用FAO数据，我们构建了每年的多层粮食贸易系统表示，并通过具有动态出口禁令的随机冲击传播模型量化了稳健性。我们发现，尽管全球化程度的提高增强了相互依赖性和放大了连锁反应，但稳健性趋势仍然异质性。谷物贸易已变得更加去中心化和对针对性冲击具有韧性；相反，动物和植物脂肪显示出围绕关键出口国如印度尼西亚和马来西亚的集中化和脆弱性。这些结构性转变导致了系统性脆弱性不同的转变， disproportionately 威胁了已经脆弱的地区，如非洲和南亚。
英文摘要：
Recent global food trade disruptions have evidenced how local shocks can cascade into global security threats. While the capacity of food systems to absorb spillovers depends heavily on its underlying trade networks, few studies quantify how their temporal evolution reshapes systemic vulnerability over time. Here, we evaluate how changes in global connectivity from 1986 to 2022 reshaped responses to production shocks. Using FAO data, we built yearly multiplex representations of the food trade system and quantified robustness through a stochastic shock-propagation model with dynamic export bans. We find that while increasing globalization intensified inter-dependencies and amplified cascades, robustness trends remain heterogeneous. Grain trade has become more decentralized and resilient to targeted shocks; conversely, Animal and Vegetable Fats exhibit growing centralization and fragility around key exporters like Indonesia and Malaysia. These structural transformations caused diverging shifts in systemic vulnerability, disproportionately threatening already vulnerable regions such as Africa and Southern Asia.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
