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水足迹定义为一个国家或地区在一定时间内消费的所有产品和服务所需要的水资源数量,一个国家或地区的水足迹等于国内用水量和虚拟水量净进口的代数和。本文以广州市为案例,分6个账户对广州市的虚拟水进行计算,最终得出广州市2007年的水足迹为989.32×108m3,其中工业产品的水资源需求最大,其次是农产品和畜产品。近年来广州市水资源的污染严重,水足迹理论的提出对于广州市水资源的可持续利用提供了新的思路。
The water footprint is defined as the amount of water needed for all goods and services that a country or region consumes over a certain period of time. The water footprint of a country is equal to the algebra sum of net imports of domestic water and virtual water. Taking Guangzhou as an example, this paper calculates the virtual water in Guangzhou with 6 accounts, and finally concludes that the water footprint of Guangzhou was 989.32 × 108m3 in 2007, of which the water demand of industrial products is the largest, followed by that of agricultural products and livestock products . In recent years, the pollution of water resources in Guangzhou is serious. The proposal of water footprint theory provides a new idea for the sustainable use of water resources in Guangzhou.