石羊河流域水资源变化分析与保护利用建议

Analysis on variation of water resources in the Shiyang River basin and recommendations for protection and utilization

水资源保护利用是石羊河流域重点治理的核心。对石羊河各条河流出山口流量统计分析表明,石羊河天然径流量基本稳定;下游蔡旗水文站近50年年径流量从4亿~5亿m^3下降到1亿m^3左右,其水量减少原因是上中游消耗过大。流域内人口、耕地比20世纪50年代翻了一番多,人均水资源占有量降到了700多m^3,民勤县人均地表水资源量不到200m^3,水资源供需矛盾突出。当前农业用水占总用水量的86.2%,相同产值情况下,石羊河流域农业用水量是工业用水量的23.6倍。提出了以调整农业种植结构、推进节水型社会建设和制定科学合理的流域水资源管理制度为思路的水资源保护利用对策。

Water resources protection and utilization is the key measures to the comprehensive management of the Shiyang River basin.According to the statistics of each tributary of the Shiyang River that flows across mountain pass,natural net flow rate of the Shiyang River is basically stable.The annual net flow rate at Caiqi hydrology station declines from 400 million^500 million m^3 to 100 million m^3.The population and farmland have doubled since 1950s.Water resources per capita have dropped to over 700 m^3 and surface water resources per person in Minqin are less than 200 m^3.The supply-demand contradiction of water resources appears conspicuous.Current agricultural water consumption accounts for 86.2%of all water use.Under the condition of the same output value,agricultural water consumption is 23.6 times as much as that of industry in the Shiyang River basin.At last,the paper puts forward the countermeasures of water resources protection and utilization by adjusting agricultural planting structure,promoting the construction of water-saving society and establishing a scientific and reasonable system of watershed water resources management.