| 引用本文: | 郑和祥,孙晨云,刘 娜,等.黄河南岸灌区玉米根系吸水来源研究[J].灌溉排水学报,2024,43(S1):125-130. |
| ZHENG Hexiang,SUN Chenyun,LIU Na,et al.黄河南岸灌区玉米根系吸水来源研究[J].灌溉排水学报,2024,43(S1):125-130. |
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| 摘要: |
| 【目的】明晰玉米根系吸水来源。【方法】采用液态水稳定氢氧同位素技术，通过监测黄河南岸灌区上、中、下游灌域的分层土壤水和玉米根系土壤水中的氢氧稳定同位素组成，结合直观图法和MIXSIAR模型确定玉米根系吸水来源，分析各供给水源的贡献比例。【结果】拔节期玉米生长较快，需水量较大，灌区上、中、下游干旱程度不同，导致玉米根系主要吸水深度也不同。上游主要吸收0~20 cm土层的土壤水，其水源贡献率为38.1%，20~40 cm土层贡献率为23.7%；中游主要吸收20~40 cm土层的土壤水，贡献率为43.6%，0~20 cm土层贡献率为27.4%；下游主要吸收20~40 cm土层的土壤水，贡献率为63%，0~20 cm土层贡献率为20%。【结论】干旱环境下玉米会改变根系吸水深度，整个生育期内玉米根系吸水深度由浅入深再变浅；且玉米对各潜在水源的利用比例与其根系吸水深度以及不同水源对土壤水的补给密切相关。 |
| 关键词: 干旱半干旱地区；玉米；稳定氢氧同位素；根系吸水；水分来源 |
| 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 |
