干旱区地理2024，Vol.47Issue(11)：1899-1914,16.DOI:10.12118/j.issn.1000-6060.2023.667
青铜峡引黄灌区农田灌溉水入渗与玉米分层吸水规律研究
Water infiltration and maize root water uptake patterns in the Qingtongxia Yellow River irrigation district
摘要
Abstract
Maize is a key crop in irrigated agriculture in arid regions,and understanding the infiltration of irriga-tion water and stratified water uptake patterns of maize is crucial for studying the soil-plant-atmosphere continu-um water transfer processes within maize field systems.This study was conducted in the Qingtongxia Yellow Riv-er irrigation district in the arid climatic conditions of Ningxia,China.During the maize growing season,samples of precipitation,irrigation water,groundwater,maize stems,and soil from seven depths within 1 meter were col-lected.The isotopic variations of δ2 H and δ18 O were analyzed.Using the guidance of hydrogen and oxygen stable isotopes combined with soil moisture content analysis,the infiltration process of irrigation water into the field was investigated.The absorption proportions and patterns of maize water uptake from various soil layers were ex-amined using both the direct comparison method and Bayesian mixture models.The results indicate that:(1)The hydrogen and oxygen isotopes of successive precipitation,irrigation water,and groundwater in the Qingtongxia Yellow River irrigation district show an enrichment trend,while those of maize stem water gradually deplete;iso-topes of soil water are enriched in the shallow layers(0-30 cm)and stabilize below this depth.(2)The atmospher-ic precipitation line in the irrigation district is represented by δ2 H=6.67δ18 O-9,with precipitation significantly in-fluenced by secondary evaporation under clouds.After entering the field,both precipitation and irrigation water undergo intense surface evaporation,while groundwater is replenished by both.(3)Irrigation water rapidly infil-trates into the field within five days of application,with piston flow as the primary infiltration mechanism in the irrigation district.(4)Maize predominantly absorbs water from the shallow soil layer(0-30 cm),with the absorp-tion proportion reaching 44.70%over the entire growth period;following irrigation,there is no significant change in the main water absorption layer of maize,with the shallow layer contributing the most.(5)The stratified ab-sorption and utilization of soil water by maize are closely correlated with soil temperature and moisture content.The increase in shallow soil temperature and the decrease in soil moisture content due to transpiration and evapo-ration promote enhanced utilization of water from the middle and deep soil layers.Adequate moisture in the shal-low soil layer is crucial for maize growth,and under arid conditions,timely irrigation is necessary to replenish water in the main soil layer to ensure normal growth and development.关键词
稳定同位素/灌溉水入渗/直接对比法/MixSIAR模型/根系吸水变化/大气降水线Key words
stable isotope/irrigation water infiltration/direct contrast method/MixSIAR model/root water ab-sorption changes/atmospheric precipitation line引用本文复制引用
马国荣,庄淏然,许德浩,马永成,赵梦扬,冯克鹏..青铜峡引黄灌区农田灌溉水入渗与玉米分层吸水规律研究[J].干旱区地理,2024,47(11):1899-1914,16.基金项目
清华大学-宁夏银川水联网数字治水联合研究院联合开放基金资助项目(sklhse-2023-Iow11) （sklhse-2023-Iow11）
国家重点研发计划项目(2021YFD1900600) （2021YFD1900600）
宁夏自然科学基金重点项目(2021AAC02007,2022AAC02007) （2021AAC02007,2022AAC02007）
宁夏高等学校一流学科建设项目(NX-YLXK2021A03)资助 （NX-YLXK2021A03）
