【摘要】 水是农业生态系统中最重要的组成要素之一,也是粮食生产的一个重要安全保证,在确保粮食资源持续供应增长人口的需求中起到了根本的作用.文中分析了虚拟水的政策内涵,并依据对我国过去20年粮食生产与进口替代趋势的分析和国内外的粮食生产条件,估算出1980~2000年,小麦进口每年有10.2×109m3水和27.7×106hm2土地输入,玉米进口约有0.3×109m3水和1.6×106hm2土地被间接利用.这对缓解我国农业用水和耕地资源紧张状况,灵活利用粮食贸易进口,解决粮食生产中的用水困境,利用虚拟水进口来补偿水资源的贡献率,具有重要的现实意义.更多还原

【Abstract】 Water is one of the most important components of agricultural ecosystem,and also a source of food security,which plays an essential role in ensuring sustainable food resources for a growing population.In this study,the policy relevancy of virtual water was addressed,with food production,alternative trend of import,and product condition analyzed.The results showed that an average of 10.2×10~9 m~3 water and 27.7×10~6 hm~2 land was transferred by imported wheat,while an average of 0.3×10~9 m~3 water and 1.6×10~6 hm~2 land was transferred by imported maize.The sum of virtual water equivalent was 10.5×10~9 m~3.It’s of significance to alleviate the pressure of water stress in agriculture and arable land,help to resolve water predication of food production by food imports,and compensate water endowment.更多还原