Tracing the Origin of Moisture Absorption of Corn in the Yellow River Irrigation Area of Ningxia:A Study on Water Uptake Dynamics and Utilization Efficiency
Investigating the issues of water supply and utilization efficiency in arid regions is crucial for optimizing farmland irrigation systems and improving the efficient use of water resources.This study focuses on corn in the Ningxia Qingtongxia Yellow River Irrigation Area,utilizing stable hydrogen and oxygen isotope techniques for the quantitative tracking of isotopic characteristics in atmospheric precipitation,soil water,and corn xylem water.Through the integrated use of direct comparison methods,the MixSIAR model,and transpiration separation techniques,this research deeply analyzes the main water absorption depths of corn during its growth period,the relative contribution rates at different stages,and water use efficiency(WUE)along with the influence of environmental factors.The results indicate that corn primarily absorbs water from the shallow soil layer(0～30 cm),with average contribution rates at different growth stages being 44.10%(germination),35.44%(jointing),41.54%(tasseling),41.66%(grain filling),and 48.10%(maturity).Throughout the growth period,WUE exhibits a fluctuating upward trend,significantly affected by environmental factors such as the difference in saturated vapor pressure,soil temperature,and air temperature.The findings reveal the high dependency on shallow soil water during the growth and development of corn in this region and the significant increase in water use efficiency as the growth period progresses.
Hydrogen and oxygen stable isotopesevapotranspiration separationTG modeltotal primary productivitycrop transpirationroot water uptake sourceswater absorpation depth
万方数据
维普
