| Modeling of dynamics of deep soil water and root uptake of maize with mulched drip irrigations using HYDRUS-2D |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2021.03.04 |
| Key Words: HYDRUS soil matric potential mulched drip irrigation groundwater recharge maize root water uptake |
| Author Name | Affiliation | | DING Yuntao | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | CHENG Yu | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Tibin | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | JI Xiangxiang | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | QIAO Ruonan | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China, Northwest A&F University, Yangling, Shaanxi 712100, China | | FENG Hao | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water\|saving Agriculture in Arid Area of China, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
|
| Hits: 734 |
| Download times: 277 |
| Abstract: |
| The Hetao Irrigation District (HID) of Inner Mongolia, which is located in the arid area in Northwestern China, generally has a shallow groundwater with a great fluctuation annually. Understanding the water recharge effect from the deep to root layer and water uptake by root under mulched drip irrigation helps to revamp and promote drip irrigation technology in the HID. A two\|year (2017-2018) field experiment was conducted, in which three soil\|water matric potential (SMP) threshold values including -10 kPa(S1),-30 kPa(S3), and -50 kPa(S5), were used to schedule the mulched drip irrigation for spring maize. Then, the HYDRUS-2D model was used to simulate the water content in the 0~120 cm soil layer, the cumulative water flux at the lower boundary,and the water uptake rate by root under different drip irrigation regimes.The results showed that comparing the simulated soil moisture contents with the measured, the calibrated HYDRUS-2D was reliable to simulate water movement in the studied soil layers under drip irrigation, gave the acceptable root mean square error (RMSE) (0.039-0.042 cm3·cm-3) and determination coefficient (R2) of 0.78~0.73. The soil moisture contents in the deep layers of 100 cm and 120 cm depth were not significantly different among the different treatments, indicating that the different drip irrigations had little effect on water movement in the deep layers. The different drip irrigation levels significantly affected the cumulative water flux at the lower boundary of root zone and root water uptake. The recharge (capillary rising) from deeper to root layer increased from 31.9 mm to 49.6 mm with decreasing SMP threshold values of S1, S3 and S5. When the SMP threshold value was -50 kPa (S5), the lowest root water uptake intensity was predicted, showing a stressed root activity and resulting in the significantly restricted growth and yield in S5 relative to S1 and S3 (P<0.05); while the difference in leaf area index, aboveground biomass, and grain yield between S1 and S3 was not significant (P>0.05). That means the S3 treatment with the SMP threshold value of -30 kPa, which irrigation quota was 240~300 mm, improved water use efficiency and maintained the root activity of water uptake. Therefore, the SMP threshold value of -30 kPa was recommended to schedule mulched drip irrigation for spring maize production in the studied area. |
|
|
|