敦煌1980-2012年农业水足迹及结构变化特征

Agriculture water footprint and structural characteristics in Dunhuang from 1980 to 2012

运用水足迹模型,从生产水足迹角度计算评价了1980-2012年敦煌市农业水足迹及水资源的可持续性,并进行敦煌农业水足迹结构的合理性研究。研究表明:(1)1980-2012年敦煌市农业水足迹从1980年的1.26×108m3增加到2012年5.43×108m3,对水资源的真实占用是农业用水统计量的1.72倍;敦煌以经济作物为主的农业结构不合理,耗水作物占经济作物种植的50%以上。(2)水足迹研究为解决干旱区水资源在本流域或更大范围内的合理配置提供了借鉴。敦煌市水资源利用呈不可持续状态,调整经济作物种植结构、实施虚拟水战略,实现农业水资源的高效利用是缓解敦煌水资源紧缺问题的主要措施。

The agricultural water footprint of Dunhuang city during 1980-2012 was calculated from the perspective of productive water footprint; the model of water footprint was used to analyze the structure of water footprint and evaluate the sustainability of water resources utilization in Dunhuang city. The results showed that：（ 1） the water footprint of Dunhuang increased from 1. 26 × 108m3 in 1980 to 5. 43 × 108m3 in 2012. The water footprint was 1. 72 times of the amount of agricultural water use statistics data. The agricultural structure in Dunhuang was irrational,the crops need more water accounted for more than 50% of the crop planted in this region.（ 2） In conclusion water resources utilization in Dunhuang city was unsustainably recently. Strategies such as adjusting the structure of the planting of economic crops,applying the virtual water and experiencing the efficient utilization of agricultural water resources are the keys to alleviate water shortage problem.