宁夏青铜峡灌区水土化学场演化态势初步分析

Evolvement trend of water-soil chemical field in Qingtongxia Irrigation Area

本文以研究区翔实的水土化学多年动态测试资料为依据 ,勾划了 3个时段 9个化学参数值分布的系列图表 ,揭示了水土化学时空演化的规律性 ,以及两者演化联动的异同性。指出灌区水土经历了脱盐淡化的进程 ;由于地下水位居高不下 ,次生盐渍化仍在发生 ,减少引黄灌溉水量和降低地下水位才能确保土壤朝向脱盐良性循环发展 ;提出引用黄河水量、开发地下水和回用沟排水的多源灌溉 ;发展农、林、牧、果多种经济 ,提倡生态农业 。

Based on the full and accurate information observed and tested dynamically for water soil chemistry in last 40 years,this paper sketches a numerical spectrum chart with nine chemical parameters in three periods.It shows the law of water soil chemical characteristics in spatial and temporal evolvement and the similarities and differences of both water and soil in their evolvement.Conclusions are drawn:1.the situation of water and soil in the irrigation area is being in the process of desalination;2.the process of by desalination is continuing due to the stable high ground water table,so that the reduction of irrigation water and lowering the ground water table are effective ways to ensure the desalination of soil;3.water from multiple sources including Yellow River,ground water and ditch drainage water should be conjunctively used in irrigation;4.multiple economics of planting,fruits,forestry and herd should be developed and drought resistance as well as salt resistance crops should be encourage and popularized.