一、试验目的与试区自然条件井渠结合、井灌代排改良盐碱地试验的目的主要是秋季抽取地下水进行储水灌溉代替引黄水秋浇,从而把年内秋季引黄水量大部压减,改变大灌渠水,导致土壤次生盐渍化的局面,可有效地控制秋季地下水位,降减冬季冻土层内的水分和盐分,防止翌年春季土壤返盐耕地潮塌,改善耕层水、气、热 First, the purpose of the experiment Combined with the well conditions of the test area natural well, well irrigation and drainage to improve the saline-alkali soil test is mainly to extract groundwater in autumn to replace the Yellow River water diversion irrigation, thereby reducing most of the Yellow River water during the fall, changing the irrigation channel Water, resulting in secondary salinization of soil, which can effectively control the autumn groundwater table and reduce the moisture and salinity in winter permafrost so as to prevent tidal collapse of soil returning to saline soil in next spring, and improve the water, gas and heat in tillage