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| DOI：10.13522/j.cnki.ggps.2019459 |
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| Numerical Simulation of Water Movement in Root Zone of Walnut Tree under Drip Irrigation in South Xinjiang |
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JIAO Ping, HUDAN·Tumarday*, MILIXIATI·Minadola
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College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China
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| Abstract: |
| 【Objective】The objective of this paper to numerically study root distribution and water movement in the proximal soil of a mature walnut tree under drip irrigation in southern Xinjiang in attempts to provide guidance for improving irrigation water use efficiency.【Method】The walnut tree was in Aksu and water flow in soil proximal the tree under drip irrigation was simulated suing the software Hydras 2D. 【Result】 ①The roots were mainly distributed in soil 0~120 cm away from the trunk in the horizontal direction and 0~60 cm in the vertical direction. ②The drip irrigation belt should be placed 60 cm away from the trunk; the irrigating water could infiltrate to the depth of 60 cm with the irrigation uniformity to be higher than 87%. ③Calibration of the model against experimental data gave a RMSE in the range of 0.016~0.022 cm3/cm3, a Re in the range of 0.04~0.12, and a R2 in the range of 81.03%~97.19%, indicating that the model was robust for simulating soil water flow with root uptake by the walnut tree taken into account.【Conclusion】Root distribution and water distribution simulated by the model under different drip irrigation scheduling showed that the optimal irrigation was to place the drip irrigation belt 60 cm away from the trunk and keep the irrigation amount at 450 m3/hm2. |
| Key words: Walnut tree; drip irrigation; soil wetted area; numerical simulation; Hydrus 2D |
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