景泰川灌区次生盐渍化及其防治

Secondary Salinization and ifs Prevention in the Irrigation Land of Jintaichuan

景泰川灌区位于甘肃省北部,景泰县内。1974年景泰电力提水工程建成,最大提水高度406.2米,设计流量10.5米/秒,有效灌溉面积30万余亩。本区为干旱区大陆性气候,年平均降水量186毫米,蒸发量3600毫米,且风沙多。过去由于没有灌溉条件,大面积土地长期荒芜。景电工程的建成,彻底改变了本区的自然面貌和生产条件,短短的十四年间,这里建成了荒漠中的大片绿洲。但是,随着土壤灌溉,灌区的次生盐渍化已经露头。根据第二次土壤普查统计,己经盐化面积30482亩,占总耕地面积的10.16%。因此,充分发挥提黄河水灌溉的效益。

The Jintaichuan irrigation land lies to the northern part of Gansuprovince, in the boundary of Jintai County.After the JintaiElectric Power Project of Water--supply was constructed in 1974, theeffective irrigated land areas are 20,000 ha.In the passed decade, although oases have been established indeserts, the salinization land in irrigated regions has appeared atthe same time, and the areas of secondary salinization soils havecovered 1/10 of the ploughs, This paper deal with the reasons andthe process of salinization in Jintaichuan irrigation land and discussthe improving methods.