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| Simulation analysis on water leakage and nitrogen leaching of winter wheat farmland under micro sprinkler irrigation in Huang-Huai-Hai Plain |
| Received:November 15, 2022 |
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| KeyWord:winter wheat;WHCNS model;water leakage;nitrogen leaching |
| Author Name | Affiliation | E-mail | | QIAO Yibo | College Agronomy, Henan Agriculture University, Zhengzhou 450046, China | | | WU Pengnian | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450046, China | | | WANG Yanli | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450046, China | | | LIU Changshuo | College Agronomy, Henan Agriculture University, Zhengzhou 450046, China | | | LI Yuming | College Agronomy, Henan Agriculture University, Zhengzhou 450046, China | | | WEN Pengfei | College Agronomy, Henan Agriculture University, Zhengzhou 450046, China | | | GUAN Xiaokang | College Agronomy, Henan Agriculture University, Zhengzhou 450046, China | | | WANG Tongchao | College Agronomy, Henan Agriculture University, Zhengzhou 450046, China | wtcwrn@126.com |
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| Abstract: |
| Understanding the characteristics of water leakage and nitrogen leaching from winter wheat in the Huang-Huaihai Plain, can help optimize the irrigation system for wheat production and reduce the environmental impact of soil nitrogen leaching after water and fertilizer application on farmland. In this study, based on a field trial with different irrigation treatments（eg., full irrigation, deficit irrigation）and rainfed treatments set up in 2020—2022, the Soil Water Heat Carbon and Nitrogen Simulation（WHCNS）model was used to evaluate the applicability of the model by optimizing soil hydraulics and crop parameters. The calibrated model quantitatively analyzed the nitrogen leaching, water seepage, and characteristics of farmland under different water management conditions. The root mean squared error（RMSE）ranges for soil water content and nitrate-N（calculated by N）were 0.01–0.07 cm3·cm-3 and 3.37–6.39 mg·kg-1, respectively; the simulated R2 for leaf area index（LAI）and dry matter mass were ≥0.9, and the consistency indices were both ≥0.7, and the model simulations achieved the expected results. The results of simulating the dynamics of water seepage and nitrogen loss in the 0–100 cm soil layer using the validated model showed that nitrate nitrogen seepage and water seepage were consistent, and both were characterized by small single-day amounts but long duration, with the cumulative number of days of seepage accounting for 59.2%–69.4% of the total number of days in the reproductive period. Compared with full irrigation, N leaching and water leakage were reduced by 3.88%–66.94% and 37.01%–44.87%, respectively, in the two seasons of deficit irrigation, and there was no significant difference in yield between the two treatments of full and deficit irrigation, which were significantly higher than that of rainfed. The calibrated WHCNS model can be used to simulate water and nitrogen transport and crop growth in the study area. |
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