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进行三峡以上地区人类活动(水利化)对逕流影响计算的过程中,需要知道灌溉方面的用水量。估计1967年群众性水利工程已大部完成,水利化也基本实现,故灌溉用水量可根据当时的产量水平推算;而在更远的时期,逐步实现“三三制”的耕作制度后,播种面积减少了,灌溉水量也将缩小,除了单产不断提高所增添的水量将抵消一部分灌溉減少的水量外,多余的水量可供枯水季节发电及其他用途。 1967年的灌溉面积是依据党中央的指示估算的。中央指示今后若干年内开展农业的方针是:“少种高产多收和多种多收同时并举”,一方面提高单位面积产量,一方面开垦一些荒地,以达多收之目的,而提高单产则是主要的方面。根据了解的资料,今后各项工程及居民点等占地与开垦的荒地两者大致可以互相抵消,那么,在计算灌溉用水量的
In the process of calculating the impact of human activities (water conservancy) on the area above the Three Gorges, it is necessary to know the amount of water used for irrigation. It is estimated that mass water conservancy projects have been largely completed in 1967 and water conservancy has been basically realized. Therefore, the amount of irrigation water can be estimated based on the current production level. In the further period, the “three-three” farming system is gradually realized and sown As the area is reduced and the volume of irrigated water reduced, the surplus of water will be available for electricity generation in the dry season and for other purposes, in addition to the additional amount of water that will be offset by a decrease in the amount of water irrigated. The area under irrigation in 1967 was estimated on the instructions of the Party Central Committee. The central government’s guidelines for carrying out agriculture in the next few years are as follows: “fewer types of high yield, more output and more than one type of cash shall be simultaneously produced simultaneously”. On the one hand, the yield per unit area will be raised. On the other hand, some wasteland will be reclaimed to achieve the purpose of more yield, Is the main aspect. According to the information we have learned, in the future, the share of land for various projects and settlements and the wasteland reclaimed will be substantially offset by each other. Therefore, when calculating the amount of irrigation water