[1]YANG Yonghui,WU Jiabin,WU Jicheng,et al.Hydrogen and Oxygen Isotope Distribution and Water Use Characteristics of Wheat Under Different Irrigation Methods[J].Research of Soil and Water Conservation,2023,30(03):260-267.[doi:10.13869/j.cnki.rswc.2023.03.012]
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Hydrogen and Oxygen Isotope Distribution and Water Use Characteristics of Wheat Under Different Irrigation Methods
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 03
Page number:
260-267
Column:
Public date:
2023-04-10
- Title:
- Hydrogen and Oxygen Isotope Distribution and Water Use Characteristics of Wheat Under Different Irrigation Methods
- Keywords:
- drip irrigation; stable hydrogen and oxygen isotopes; moisture movement; winter wheat; water use
- CLC:
- S275.3; S275.6
- DOI:
- 10.13869/j.cnki.rswc.2023.03.012
- Abstract:
- [Objective]Ascertaining the contribution rate of different irrigation methods to wheat water use and the water absorption law of wheat root system can provide a scientific basis for the rational application of irrigation water. [Methods] Based on hydrogen-oxygen stable isotope tracing method, the characteristics of soil water stable isotope change during winter wheat growth under conventional irrigation(X)and drip irrigation(D)(X1, D1:15 mm; X2, D2:30 mm; X3 and D3:45 mm)were studied. [Results] The absorption of water deepened with the advancement of the wheat growth period. Soil moisture in 0—20 cm depth was mainly consumed by wheat in the jointing stage under different treatments. In the heading stage, X2, D1, and D2 treatments mainly used soil moisture in 0—20 cm layer, but X1 treatment mainly used soil moisture in 60—80 cm layer, accounting for 53.9%, and X3 treatment mainly used soil moisture in 40—60 cm, accounting for 77.0%. D3 treatment mainly used soil moisture in 0—60 cm layer accounting for 80.0%. In the filling stage, X1 and X2 treatments mainly used soil moisture in 0—60 cm, accounting for 86.2%, and 90.6%, respectively, while X3 treatment mainly used soil moisture in 40—60 cm layer, accounting for 73.9%. However, the water use ratio of different soil layers of D1 and D2 treatments were more uniform, ranging between 7.1%～27.8% and 13.0%～38.2%, respectively. The D3 treatment mainly utilized the water in the 20—40 cm soil layer, accounting for 51.0%. Drip irrigation, except for D2 and D3 treatments, could effectively reduce the daily water consumption of wheat. Compared with conventional irrigation, D2 and D3 treatments were more beneficial to improve the photosynthetic rate and leaf water use efficiency of wheat. Moreover, drip irrigation treatment effectively improved the wheat biomass during both the heading and harvest periods. Finally, wheat yield and water use efficiency under the drip irrigation condition increased by 21.6%～28.0% and 24.4%～36.7%, respectively, compared with conventional irrigation conditions, and the D2 treatment resulted in the highest among different treatments. The related analysis showed that during the growth process of wheat, the increment of water contribution rate of 0—20 cm layer in the heading growth stage and 80～100 cm layer in the filling growth stage was more conducive to improving the yield and water use efficiency. [Conclusion] Drip irrigation is more conducive to providing uniform water supply to crops, and reducing ineffective evaporation of water and improving crop yield and water utilization.
- References:
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Last Update:
2023-04-10