张掖市社会经济系统水循环过程研究与水量估算

Water Cycle Process Analysis and Water Volume Estimation of Socioeconomic System in Zhangye City,Gansu Province

采用投入产出分析方法,估算了张掖市各部门产品中的虚拟水含量;基于对各产品转化和流动的跟踪,系统研究了本地实体水资源与外地流入虚拟水资源在张掖市社会经济系统各环节中的流动与转化过程。结果表明,种植业部门的实体水转化与虚拟水流动构成了张掖市社会经济系统水循环的主体,外地流入的虚拟水量较少,且主要集中于水资源稀疏型产品;经济生产对种植业产品较低的消耗水平导致了大量虚拟水的流出。认为增强种植业产品在社会经济系统中的循环强度是张掖市降低水资源流失以及提高水资源利用效率的有效手段。

Based on resources flowing theory and virtual water concept,this study constructs an extended input-output model to analyze the structural relationships among economic activities in Zhangy City and their physical relationships with water resources.This model allows us to trace the transformation of various products and to calculate the level of the virtual water contents of each sector＇s product,thus offering the possibility of studying the water movement and transformation in a socio-economic system.It is shown that the consumption of physical water resources and the transformation and movements of virtual water in farming sectors become the main body of water cycle in the socio-economic system in the study area.The imported products are characterized by relative lower virtual water contents and the virtual water following from other regions is little.The lower consumption of farming products in the study area has caused large amounts of farming products and virtual water following out of the study area.From the view of regional sustainable development,strengthening the consumption level of farming products appear to be the practical means to reduce the export of virtual water and increase utilization rate of the limited water resources.