通过国际作物贸易实现的全球水压减缓
Ying Shi1, Xu Zhao1, Martin R Tillotson2
1Institute of Blue and Green Development, Shandong University, Weihai 264209, China.
iScience
|July 14, 2025
概括
国际作物贸易可以节省水,但只有当出口从富含水的地区转移到缺水的地区. 优化出口国家的水生产率是最大限度地节约全球水资源和减少水压力的关键.
科学领域:
- 环境科学 环境科学
- 农业经济学 农业经济学
- 水资源管理 水资源管理
背景情况:
- 国际作物贸易通过利用各国不同的水产生产率,为全球节水提供了潜力.
- 然而,如果出口来自水资源稀缺地区,贸易可能会加剧水资源压力,转移负担而不是减轻负担.
研究的目的:
- 评估国际作物贸易对全球水资源压力的净影响.
- 确定减轻或加剧水资源短缺的贸易模式.
- 探索优化贸易的战略,以提高节水效率.
主要方法:
- 使用虚拟稀缺水 (VSW) 节约/损失指标.
- 在150个国家的109种作物中使用了精制的贸易矩阵.
- 根据合作伙伴之间的水生产率和压力差异对贸易关系进行分类.
主要成果:
- 国际作物贸易通常减轻了全球水资源压力,但超过一半的现有贸易联系目前增加了水资源压力.
- 对贸易关系进行了分类,揭示了节水和损失的具体模式.
- 场景分析表明,提高出口者的水生产率可以将大量的水损失链接转化为节水链接.
结论:
- 国际作物贸易是水资源管理的双刃剑;仔细考虑贸易伙伴的水资源压力至关重要.
- 提高作物水生产率,特别是在缺水的出口国家,是将水损失转化为节约水的可行策略.
- 专注于优化贸易路线和提高用水效率的政策干预措施可以大大促进全球水安全.
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