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| DOI： |
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| Distribution of Stable Hydrogen and Oxygen Isotopes in the Root Zone of Alfalfa under Drip Irrigation |
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WU Jiabin, MIAO Shu, XU Bing, HAN Bing, GAO Jinyu
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Inner Mongolia University, Hohhot 010021, China; Institute of Water Resources for Pastoral Area, MWR, Hohhot 010020, China; Inner Mongolia Agriculture University, Hohhot 010018, China
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| Abstract: |
| To understand moisture movement in the root zone of alfalfa and the mechanism of water use efficiency under drip irrigation, we analyzed the stable isotopes of hydrogen and oxygen in water within the root zone of alfalfa. The results showed that the stable hydrogen and oxygen isotopes were enriched in the lower part of the root zone, and the enrichment increased with soil depth. Drip irrigation promoted root development, thereby increasing water uptake. After irrigation, it is not clear where the roots take water, while when the soil was dry priori to irrigation, the alfalfa roots appeared to have taken water from soil at the depth of approximately 30 cm. |
| Key words: drip irrigation; alfalfa; stable hydrogen and oxygen isotope; root zone water |
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