【摘要】 在引黄水量大幅减少且河套灌区大范围实施节水改造工程的背景下,为研究河套灌区渠道衬砌前后对农田水土环境的影响,通过对隆盛节水改造典型示范区的环境效应进行监测分析研究,结果显示示范区环境变化主要与灌水量有关,渠道衬砌有效提高了灌溉水利用系数,对地下水埋深及土壤盐碱化有一定影响。为控制灌区土壤盐碱化,示范区地下水埋深阈值为1.6~1.8 m,西济支渠区域适宜引水量为1 645~1 850万m~3。渠道衬砌后灌区具有535万m~3节水潜力,研究结果将为灌区节水改造提供理论基础。更多还原

【Abstract】 Under the background of Yellow River diversion quantity decreasing and water saving development in a large scale,in order to study the effect of channel lining on the soil and water environment of Hetao Irrigation Area,this paper analyzed the environmental effect of typical demonstration area of Longsheng Water Saving Reconstruction Project. The result shows that the environmental change in the demonstration area is mainly related to the irrigation amount. The canal lining effectively improves the utilization coefficient of irrigation water and has certain influence on the groundwater level and soil salinization. In order to control the soil salinization in the irrigation area,the threshold value of the groundwater table in the demonstration area is 1.6 to 1.8 m,and the appropriate water diversion in the west branch area is 16.45 million m to 18.5 million m~3. The study results can provide theoretical basis for the water-saving reconstruction of irrigation area with the water-saving potential of 5.35 million m~3.更多还原