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1.利用现有排水设备寻求适宜排水沟间距是一种省人、省地而又经济的办法,且所得结果应用于本地区也较为切合实际。 2.在银川灌区的土壤及水文地质情况下,若能将地下水位在一个半月内降低至1.5公尺以下,则可达到盐渍土改良上所需的排水要求。 在全剖面(排水土层)以砂土、轻壤为主,其下层为重壤土的地区,可以开挖深约2公尺,间距500公尺的排水农沟。在全剖面以砂土、轻壤为主,而其下层为透水性能较强的土层时,可以开挖深约2公尺、间距600公尺的排水农沟。 3.若地形部位过低,排水沟不能挖至应有的深度时,可以采用长期稻田或稻旱轮作的方式,逐步加以改良。
1. It is a provincial, economical and economical way to find the appropriate drainage channel spacing by using the existing drainage equipment. It is also more practical to apply the results to the area. 2. In the case of soil and hydrogeology in Yinchuan Irrigation District, if the water table can be reduced to less than 1.5 meters in a month and a half, the required drainage for salinized soil improvement can be achieved. In the whole section (drainage soil layer), sandy soil and light soil are the main parts, and heavy soil is the lower part. Drainage ditches about 2 meters deep and 500 meters apart can be excavated. When the whole section is dominated by sandy soil and light soil, and the lower layer is a soil layer with strong water permeability, it is possible to excavate drainage drains and ditches about 2 meters deep and 600 meters apart. 3. If the terrain is too low, the ditches can not be dug to the proper depth, you can use long-term rice paddy or rice dry rotation for the way, and gradually be improved.