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榆林地区盐碱土的分布及利用情况如何?我们于1973年5—10月进行了调查:一、盐碱土的基本类型、种类、分布及面积榆林地区盐碱土总面积为146.5万亩,其中荒地盐碱土121.2万亩,耕地次生盐渍土25.2万亩.荒地盐碱土多分布于封闭盆地的滩地上,如定边县盐碱滩地,沙丘起伏,无外流河,形成大面积盐碱荒滩和许多小盐湖,含盐量特别高,常年干旱多风,年蒸发量为年降雨量的6—9倍,加剧了盐分的上升.次生盐渍土主要分布在定边八里河灌区、横山定惠渠灌区、米脂
Yulin area of saline soil distribution and utilization of how? We conducted from May to October 1973 survey: First, the basic types, types, distribution and area of saline-alkali soil Yulin area of the total area of 146.5 hectares of saline, wasteland salt 1,212,000 mu of alkaline earth and 252,000 mu of secondary saline soil in cultivated land. The saline-alkali soil in the wasteland is mainly distributed in the beach land of the enclosed basins, such as the saline-alkali land in Dingbian County, undulating dunes, Many small salt lakes, with particularly high salt content, have arid and windy annual years with annual evaporation of 6-9 times of annual rainfall, aggravating the increase of salt content. Secondary saline soil is mainly distributed in the Dingbian Bali River Irrigation District, Hui Qu irrigation, rice fat