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我省河西灌区一些地方,由于土壤板结,结构恶化,以致严重减产.因此,必须加以研究解决,达到改良土壤,增加产量的目的.本文所谈的是疏勒河流域,包括玉门市及西安、敦煌二县.这里属荒漠气候,雨量少,蒸发量大,风力特强.这里的地形和母质呈明显的带状分布:(1)山前戈壁带:包括赤金、昌马、王门镇、桥湾、踏实、玉门关等以南的戈壁滩.为砾石沉积物和残积坡积物,厚约数十米.(2)洪积-冲积平原带:包括玉门、西安、敦煌的农区.为砂、壤、粘互层组成,含易溶性盐类与高量石灰,厚十多米.(3)粘土平原带:疏勒河及党河两岸均可见到,为细紧的致密粘土,干时硬脆,层状,透水性差,称澄浆泥,呈盐滩洼荒分布,厚数米.
In some areas of Hexi Irrigation District in our province, due to soil compaction and structural deterioration, serious reduction of production has to be done, so we must study and solve them to achieve the purpose of improving the soil and increasing the output.In this paper, we discuss the Shule River Basin, including Yumen and Xi’an, Dunhuang two counties here is a desert climate, less rainfall, evaporation, particularly strong winds.The topography and parent material showed a clear banded distribution: (1) Piedmont Gobi belt: including red gold, Changma, Wang Menzhen, Qiaoban, practical, Yumen Pass and other south of the Gobi.The gravel sediments and residual slope sediment thickness of tens of meters. (2) alluvial - alluvial plain belt: including Yumen, Xi’an, Dunhuang farmland. It is composed of sand, soil and viscous interbedded layer, with soluble salts and high amount of lime, more than ten meters thick. (3) Clay plain belt: Both Shulehe River and Danghe River can be seen as tight compact dense clay, Dry hard and brittle, layered, poor water permeability, said the mud mud, was salt beach depression waste distribution, a few meters thick.