| Evaluation and simulation of irrigation uniformity in dwarf and densely planted fragrant pear orchard |
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| DOI：10.7606/j.issn.1000-7601.2024.06.19 |
| Key Words: dwarf and densely planted fragrant pear drip irrigation pipe arrangement soil moisture distribution irrigation uniformity HYDRUS-2D |
| Author Name | Affiliation | | WANG Hongxin | College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003，China； Key Laboratory of Modern Water\|Saving Irrigation of Xinjiang Production & Construction Group, Shihezi, Xinjiang 832003，China | | WANG Chunxia | College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003，China； Key Laboratory of Modern Water\|Saving Irrigation of Xinjiang Production & Construction Group, Shihezi, Xinjiang 832003，China | | YUE Xuanli | Tianye Water\|Saving Irrigation Co.Ltd., Shihezi, Xinjiang 832000, China | | MEI Hua | Hydrology and Water Resources Management Center of the Ninth Division of Xinjiang Production and Construction Corps, Tacheng, Xinjiang 834601, China | | ZHANG Jingrui | College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003，China； Key Laboratory of Modern Water\|Saving Irrigation of Xinjiang Production & Construction Group, Shihezi, Xinjiang 832003，China | | LI Yanjie | College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003，China； Key Laboratory of Modern Water\|Saving Irrigation of Xinjiang Production & Construction Group, Shihezi, Xinjiang 832003，China | | YU Zhiruo | College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003，China； Key Laboratory of Modern Water\|Saving Irrigation of Xinjiang Production & Construction Group, Shihezi, Xinjiang 832003，China |
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| Abstract: |
| The aim of this study was to clarify the impact of various irrigation technical parameters on the uniformity of irrigation in fragrant pear orchards, providing data references and technical support for the implementation of water\|saving technology in Korla balsam pear cultivation. Taking 7-year old Korla young fragrant pear as the research object, set small tube outflow (one row of two tubes) and surface drip irrigation (one row of three tubes and four tubes) to determine the soil moisture content of 0~100 cm. Setting 27 irrigation technical parameters (irrigation amount Q1, Q2, Q3; drip irrigation pipe arrangement D1, D2, D3, drip irrigation pipe spacing S1, S2, S3) combination and using the HYDRUS-2D to simulate the changes in soil moisture within 24 h after irrigation. Optimizing the change of soil moisture technical parameters was achieved by calculating the uniformity of irrigation. The results showed that within 24 h after the completion of the irrigation, soil moisture content gradually increased with the increase of soil layer depth. By comparing the measured and simulated values of soil moisture content, all the RMSE values simulated by the HYDRUS-2D model were greater than 0.01 cm3·cm-3. The NRMSE values were all lower than 20.5%. The MAE values were not greater than 0.02 cm3·cm-3. The NSE values were all higher than 0.65, reaching high simulation accuracy. The results of the above scenario of HYDRUS-2D model showed that the soil moisture content was positively correlated with the amount of irrigation and the number of drip irrigation pipes and a negative correlation with drip irrigation tube spacing. The moisture content of the soil at different depths below the drip irrigation pipe showed a trend of increasing first and then decreasing along with the increasing time. When the drip irrigation pipe was arranged and separated from a certain distance, irrigation amount was negatively correlated with the rate of uniformity of soil moisture distribution. In summary, six treatments (Q1D2S1, Q2D2S1, Q3D2S1, Q1D3S2, Q2D3S2, Q3D3S2) involving one row of three tubes with 30 cm spacing and one row of four tubes with 40 cm spacing resulted in a higher and more uniform concentration area of the balsam pear root system within the moisture distribution. This can provide an important reference for the application of drip irrigation technology to Korla balsam pear. |
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