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多年来,我们采用一个统一的标准——地下水位埋深1.5米,作为控制土壤次生盐碱化的指标。实际上,潜水蒸发强度、土壤含水量和水盐运动均与地下水位有直接关系,而灌期地下水位是随时间变化的,因此,适宜地下水位的控制也应随不同灌溉季节而变化。根据本灌区1978年以来的生产实践和调查,对地下水位的控制标准,提出以下初步意见,供讨论。一、播种期地下水埋深控制在2.5米左右,可最大限度地降低蒸发强度,控制土壤返盐
Over the years, we adopted a uniform standard - groundwater table depth of 1.5 meters, as an indicator of secondary soil salinization control. In fact, the evaporation intensity of submersion, soil water content and movement of water and salt are directly related to the groundwater level. However, the irrigation water level changes with time. Therefore, the control of appropriate groundwater level should also change with different irrigation seasons. According to the production practices and surveys conducted by the Irrigation District since 1978, the following preliminary opinions are proposed for the control of groundwater levels for discussion. First, the control of groundwater depth during planting of about 2.5 meters, can minimize the evaporation intensity, control of soil salt back