论文部分内容阅读
黄河下游引黄灌区地下水埋深通常较浅,冬小麦生长季存在对地下水的利用,论文应用稳定同位素方法研究冬小麦对地下水的利用特征。在中国科学院禹城综合试验站开展实验,通过分析不同灌溉处理条件下土壤水和植物茎水δ18O值之间的关系,应用同位素线性混合模型估算了冬小麦不同生育期对地下水的利用比例。研究结果表明,水的18O信息能很好地揭示冬小麦对不同层次土壤水的利用特征,雨养处理、40%田间持水量处理和现行灌溉制度处理下冬小麦在返青后对地下水的利用分别占其总耗水量的28%、22%和4%左右。研究结果显示适度的灌溉有利于促进作物对不同层次土壤水分的稳定利用,而现行的大田灌溉方式则抑制了作物对地下水资源的利用。
The groundwater depth in the Yellow River Diversion Irrigation District is usually shallow and the use of groundwater in winter wheat growing season exists. The stable isotope method is used to study the characteristics of groundwater utilization in winter wheat. Experiments were carried out at Yucheng Integrated Experimental Station of Chinese Academy of Sciences. By analyzing the relationship between δ18O values of soil water and plant stems under different irrigation conditions, isotope linear mixed models were used to estimate the proportion of groundwater in different growth stages of winter wheat. The results showed that water use 18O information can well reveal the characteristics of winter wheat on different levels of soil water utilization, rainfed treatment, 40% field capacity and the current irrigation system under the treatment of winter wheat after turning green, respectively, its use of groundwater Total water consumption of 28%, 22% and 4%. The results show that moderate irrigation is conducive to promoting the stable use of crops at different levels of soil moisture, while the current field irrigation methods inhibit the use of crops for groundwater resources.