| Study on numerical simulation of soil moisture dynamic variation for walnut orchard under drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2016.06.17 |
| Key Words: walnut drip irrigation root system soil water content HYDRUS-2D |
| Author Name | Affiliation | | LI Dan | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, 830052, China | | ZHAO Jing-hua | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, 830052, China | | FU Qiu-ping | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, 830052, China | | HONG Ming | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, 830052, China | | MA Ying-jie | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, 830052, China |
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| Abstract: |
| Eight-year-old walnut trees were used to study the effect of root system on soil water content in different soil layers under drip irrigation. The root system was sampled from different soil layers. HYDRUS-2D model was built with consideration of water uptake by root system and checked. The results are described as follows: in vertical 2D profile, the soil layer of 40～60 cm being 0～30 cm away from the tree had the maximal fine root density of 1 618.216 m·m-3. The RMSE value and ME of the measured and simulated values from HYDRUS-2D are less than 0.0186 cm3·cm-3 and 0.0108 cm3·cm-3, respectively, suggesting that HYDRUS model could be used in the actual experiment research. The simulated results were different according to whether the effect of root system was considered, and the volumetric water content with root system considered is significantly lower. According to the simulated value for early stage of walnut, the soil content decreased a lot 6 days and 7days after irrigation, indicating that the irrigation cycle in earlier growing stage could be set 6 days or 7 days. |
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