Distribution of Stable Hydrogen and Oxygen Isotopes in the Root Zone of Alfalfa under Drip Irrigation
WU Jiabin
MIAO Shu
XU Bing
HAN Bing
GAO Jinyu
Abstract：To understand moisture movement in the root zone of alfalfa and the mechanism of water use efficien-cy 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 in-creasing water uptake. After irrigation, it is not clear where the roots take water, while when the soil was dry prio-ri to irrigation, the alfalfa roots appeared to have taken water from soil at the depth of approximately 30 cm.
Keywords：drip irrigationalfalfastable hydrogen and oxygen isotoperoot zone water
Publication Date：2017-01-01
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：5( 14-17,27 )