陕北榆林沙区滩地甚多,按成因可分为古河谷型、湖沼洼地型和风蚀注地型.湖沼注地型滩地面积大、平坦,土澳下部有来经充分分解的泥炭,但土坡低温和水分过饱和,是从事农业生产的不利因素.本文针对这些提出井浓井排与沟排相结合排水,利用草炭和明砂改造土城等措施,建设稳产高产基本田来发展滩区的农业生产。

According to the origin and formation process, the sandy bottomland in Yulin, northeru Shaanxi is divided into three types: ancient valley, lake-mire lowland and wind erosion lowland. Among them, the lake-mire lowland accounts for over 75% of the total bottomland area. Taking Mangkeng bottomland as an example, the author analyses the advantages and disadvantages of water and soil conditions in the lake-mire bottomland. Because it developed from peat mire, peat layer and gley horizon are universally distributed under the soil layer. The peat layer consists of humus which is not completely decomposed. It can be used after maturation forced by man. The low tempe rature and excessive water saturation caused by gley horizon ropiness are the disadvantages of agricultural production. In accordance with the conditions mentioned above, the measures proposed are combining well drainage and well irrigation with ditch drainage, using turf and surface sand to improve soil, building the basic farmland with stable and high yield to develop agricultural production in bottomland.