陕西省农业水资源安全阈值空间差异研究

Study on spatial difference of safety threshold of agricultural water resources in Shaanxi Province

以陕西省各市粮食安全生产为基础,探讨陕西省各市农业生产所需水资源的最低标准。以小麦、玉米、稻谷、豆类及肉、蛋、奶等主要农产品为研究对象,从陕西省人均年消费标准入手,计算全省各市粮食安全条件下的农业水资源最低需求标准,即为农业水资源安全阈值。结果表明,陕西省农业水资源处于不安全状态。运用GIS方法对陕西省各市农业水资源安全阈值与水资源总量的比值进行分析,得出:陕西仅陕南地区及榆林市比值小于1,农业水资源处于安全状态;其余各市农业水资源相对匮乏,其中关中地区的铜川、渭南、宝鸡最为严重,比值远远大于1,当地水资源远远不能满足农业安全生产需要。

On condition that food security is guaranteed in all cities of Shaanxi Province,this paper discusses the minimum standard of water resources needed for agricultural production in these cities.Rice,wheat,maize,bean and the consumption of meet,egg and milk are the main objects of study.The total volume of grain for these cities across the province can be got when the province＇s annual average consumption per person is provided.The volume of water for irrigation can be calculated in which the minimum value is safety threshold.The results showed that Shaanxi＇s agricultural water resources are not safe.By using GIS to analyze the safety threshold of agricultural water resources and the total water resource volume in each city within the province,this paper draws a conclusion that water resources in southern Shaanxi and Yulin city are safe,and the ratio is one,while the water resources of other cities are scarce,and situations in Tongchuan,Weinan and Baoji in Guanzhong area are the most serious,where the ratio is much larger than one and the local water resources are far from enough to meet the needs of safety of agricultural production.