| Effects of temperature rise under different tillage measures on N2O emission in dryland spring wheat farmland soil |
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| DOI：10.7606/j.issn.1000-7601.2022.04.20 |
| Key Words: APSIM model spring wheat N2O temperature rise tillage measures |
| Author Name | Affiliation | | LIU Xingyu | College of Information Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Guang | College of Information Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YUAN Jianyu | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | XU Wanheng | College of Information Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHAO Ping | College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To explore the effects of temperature increase on N2O emissions in dryland spring wheat farmland soil under different tillage measures, the APSIM model, combining with datas from fixed\|point and continuous monitoring of N2O emission fluxes from the dryland spring wheat test area in Dingxi, Gansu Province was adopted in the study. The model was tested to simulate different farming practices. The suitability of N2O emission under the measures, and the simulation of N2O emission from dryland spring wheat farmland soil when the daily maximum and minimum temperature under different cultivation measures were coupled in the range of 0??2℃. The results showed that the APSIM model's simulation results of N2O emissions under different treatments were more consistent with the measured results. The minimum determination coefficient R2 was 0.80, and the maximum normalized root mean square error （NRMSE） was 0.17, indicating that the model could be used to simulate different farming. Under the measures, N2O emissions from dry farming wheat fields; within the scope of the experimental design, the daily maximum temperature remained unchanged, and the daily minimum temperature rises increased N2O emissions. The effect of increased discharge is traditional tillage (T)> non\|tillage (NT)> traditional tillage+ straw mulch (TS)> non\|tillage+straw mulch (NTS), and the maximum increase of discharge rate was 2.41% for every 0.5°C increase in the daily minimum temperature. The daily minimum temperature remained unchanged, and the daily maximum temperature rises reduced N2O emissions. The emission reduction effect was as follows: T>TS>NT>NTS. For every 0.5°C increase in the daily maximum temperature, the maximum emission reduction rate was 1.68%. The increase in emissions caused by the increase in the daily minimum temperature was greater than the emission reduction effect caused by the increase in the daily maximum temperature. |
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