| Study on the spatial distribution characteristics and models of the roots of mature walnut under drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2020.05.17 |
| Key Words: drip irrigation walnut tree root distribution numerical simulation model construction |
| Author Name | Affiliation | | JIAO Ping | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | Hudan·Tumarbai | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | Milixiati·Minadola | College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| Based on the Hydrus 1D software, four kinds of one\|dimensional root density distribution functions (measured root data model, exponential distribution model, linear distribution model, and subsection distribution model) under the condition of surface drip irrigation were carried out for numerical simulation of soil moisture. The results showed that there were significant differences of the row direction in the distribution of roots in shallow (0~40 cm), middle (50~80 cm), deep (>90 cm) (P<0.01), and plant direction (P<0.05). Under the condition of drip irrigation, the root system of walnut was mainly located in the shallow soil layer (0~40 cm), which was the main part of water absorption, accounting for 65%~73%. The accuracy of exponential distribution model, linear distribution model, and segmented distribution model were all high, and the error was within 4%. Because of the difficulty of model parameter measurement, it was recommended to use linear distribution function and segmented distribution function to simulate root distribution under the condition of lack of root data. |
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