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| DOI：10.13522/j.cnki.ggps. 2023452 |
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| Study on sources of maize root water absorption in irrigation area of south bank of Yellow River |
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ZHENG Hexiang, SUN Chenyun, LIU Na, WU Jiabin
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1. Institute of Pastoral Hydraulic Research, MWR, Hohhot 010020, China;
2. Chaozhou City Beixi Bridge Gate Management Office, Chaozhou 521000, China
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| Abstract: |
| 【Objective】The research on crop moisture sources is of great significance to the formulation of reasonable crop irrigation system, the improvement of agricultural water use efficiency and the alleviation of water shortage in arid and semi-arid areas in China. 【Method】 In this study, hydrogen and oxygen stable isotope technique in liquid water was used to analyze the distribution characteristics of hydrogen and oxygen stable isotopes in corn root layer water from the perspective of different irrigation fields in the same irrigation area. 【Result】 The results showed that the rapid growth of corn during elongation stage required a large amount of water. Due to the different drought degrees in the upper, middle and lower reaches of the irrigation area, the main water absorption depth of corn root system was slightly different from that in other areas: the contribution rate of 0-20 cm in the upper reaches was 38.1%, and that of 20-40 cm was 23.7%; The contribution rate of 0-20 cm in the middle reaches was 27.4%, and that of 20-40 cm was 43.6%. The contribution rate of 0-20 cm in the lower reaches was 20%, and that of 20-40 cm downstream was 63%. 【Conclusion】 Corn in arid and semi-arid areas is affected by drought during elongation stage, which ranges from the main water intake layer to deep soil. Hydrogen and oxygen stable isotopes can provide theoretical basis and technical support for the study of corn water sources in arid and semi-arid areas. |
| Key words: arid and semi-arid areas; corn; hydrogen and oxygen stable isotopes; root uptake; water source |
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