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| Estimating distribution of water uptake with depth of winter wheat by hydrogen and oxygen stable isotopes under different irrigation depths |
| GUO Fei1, MA Juan-juan1, ZHENG Li-jian1, SUN Xi-huan2, GUO Xiang-hong1, ZHANG Xue-lan1 |
1 College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R.China
2 Shanxi Conservancy Technical College, Yuncheng 044004, P.R.China |
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摘要 Crop root system plays an important role in the water cycle of the soil-plant-atmosphere continuum. In this study, combined isotope techniques, root length density and root cell activity analysis were used to investigate the root water uptake mechanisms of winter wheat (Triticum aestivum L.) under different irrigation depths in the North China Plain. Both direct inference approach and multisource linear mixing model were applied to estimate the distribution of water uptake with depth in six growing stages. Results showed that winter wheat under land surface irrigation treatment (Ts) mainly absorbed water from 10–20 cm soil layers in the wintering and green stages (66.9 and 72.0%, respectively); 0–20 cm (57.0%) in the jointing stage; 0–40 (15.3%) and 80–180 cm (58.1%) in the heading stage; 60–80 (13.2%) and 180–220 cm (35.5%) in the filling stage; and 0–40 (46.8%) and 80–100 cm (31.0%) in the ripening stage. Winter wheat under whole soil layers irrigation treatment (Tw) absorbed more water from deep soil layer than Ts in heading, filling and ripening stages. Moreover, root cell activity and root length density of winter wheat under Tw were significantly greater than that of Ts in the three stages. We concluded that distribution of water uptake with depth was affected by the availability of water sources, the root length density and root cell activity. Implementation of the whole soil layers irrigation method can affect root system distribution and thereby increase water use from deeper soil and enhance water use efficiency.
Abstract Crop root system plays an important role in the water cycle of the soil-plant-atmosphere continuum. In this study, combined isotope techniques, root length density and root cell activity analysis were used to investigate the root water uptake mechanisms of winter wheat (Triticum aestivum L.) under different irrigation depths in the North China Plain. Both direct inference approach and multisource linear mixing model were applied to estimate the distribution of water uptake with depth in six growing stages. Results showed that winter wheat under land surface irrigation treatment (Ts) mainly absorbed water from 10–20 cm soil layers in the wintering and green stages (66.9 and 72.0%, respectively); 0–20 cm (57.0%) in the jointing stage; 0–40 (15.3%) and 80–180 cm (58.1%) in the heading stage; 60–80 (13.2%) and 180–220 cm (35.5%) in the filling stage; and 0–40 (46.8%) and 80–100 cm (31.0%) in the ripening stage. Winter wheat under whole soil layers irrigation treatment (Tw) absorbed more water from deep soil layer than Ts in heading, filling and ripening stages. Moreover, root cell activity and root length density of winter wheat under Tw were significantly greater than that of Ts in the three stages. We concluded that distribution of water uptake with depth was affected by the availability of water sources, the root length density and root cell activity. Implementation of the whole soil layers irrigation method can affect root system distribution and thereby increase water use from deeper soil and enhance water use efficiency.
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Received: 02 July 2015
Accepted:
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| Fund: The research was supported by the National Natural Science Foundation of China (50979065, 51109154 and 51249002), the Natural Science Foundation of Shanxi Province, China (2012021026-2), the Program for Science and Technology Development of Shanxi Province, China (20110311018-1), the Specialized Research Fund for the Doctoral Program of Higher Education, China (20111402120006, 20121402110009) and the Program for Graduate Student Education and Innovation of Shanxi Province, China (2015BY27). |
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Corresponding Authors:
MA Juan-juan, Mobile: +86-13834556370, E-mail: mjjsxty@163.com
E-mail: mjjsxty@163.com
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| About author: GUO Fei, Mobile: +86-15803430986, E-mail: guo4666567@163.com |
Cite this article:
GUO Fei, MA Juan-juan, ZHENG Li-jian, SUN Xi-huan, GUO Xiang-hong, ZHANG Xue-lan.
2016.
Estimating distribution of water uptake with depth of winter wheat by hydrogen and oxygen stable isotopes under different irrigation depths. Journal of Integrative Agriculture, 15(4): 891-906.
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