论文部分内容阅读
当前,我国经济、社会可持续发展面临着水资源紧缺,干旱缺水威胁日益严重的挑战。按现状用水量统计,全国中等干旱年缺水358亿立方米,其中农业灌溉缺水300亿立方米。农业灌溉是用水大户,其用水量占全国总用水量的70%,由于灌溉方式落后,输水渠道大部分是土渠,加上工程老化失修和配套不全,农业灌溉水的利用率只有40%,仅为发达国家一半左右;单方水的粮食生产能力只有0.85公斤左右,远低于2公斤以上的世界发达国家水平,水的浪费十分严重。因此,节约用水,大力推广节水灌溉,是关系我国人口、
At present, China’s economy and social sustainable development are facing the challenge of the shortage of water resources and the increasingly serious threat of drought and water shortage. According to the statistics of current water consumption, the national water shortage is 35.8 billion cubic meters during moderate drought, of which 30 billion cubic meters of agricultural irrigation water shortage. Agricultural irrigation is a major user of water, and its water consumption accounts for 70% of the total water consumption in the country. Due to the backward irrigation modes and the mostly water transmission channels, together with the aging and disqualification of the project, the utilization rate of agricultural irrigation water is only 40% , Only about half of developed countries; unilateral water food production capacity of only about 0.85 kg, well below the level of 2 kg of developed countries in the world, water wastage is very serious. Therefore, to save water and vigorously promote water-saving irrigation is related to our population,