| Effects of combined organic\|inorganic fertilizer application on soil N2O emissions from farmland in the semi\|arid area of the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2023.03.24 |
| Key Words: spring wheat N2O emission fertilization methods organic/inorganic fertilizers |
| Author Name | Affiliation | | DU Mengyin | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YUAN Jianyu | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Guang | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YAN Lijuan | College of agriculture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | GUO Jiang | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YAO Wuyangmei | College of forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To explore the effects of different fertilization methods on N2O emission from dryland wheat field soil, three fertilization methods of single application of organic fertilizer (M), single application of inorganic fertilizer (N) and combined application of organic and inorganic fertilizer (MN) were arranged with no fertilization (CK) as the control. The soil N2O emission flux in spring wheat field was determined by static box\|gas chromatography, and the related factors affecting soil N2O emission (NO-3-N, NH+4-N, soil temperature, soil water content) and spring wheat yield were determined simultaneously. The results showed that the spring wheat field was the N2O emission source in the whole growth period, and the N2O emission peak appeared in each treatment after fertilization. The order of cumulative N2O emissions from soil under different treatments was N>MN>M>CK, the net loss of N2O (calculated as N) was 1.1758~1.428 kg·hm-2, accounting for 1.12%~1.36% of the nitrogen application amount in the current season. The combined application of organic and inorganic fertilizers reduced the loss of nitrogen in nitrogen fertilizers in the form of gas. Compared with the CK treatment, the spring wheat yields of the MN, N and M treatments increased by 45.1%, 31%, and 18.8%, respectively. The soil NO-3-N and NH+4-N of each treatment increased significantly due to the influence of fertilization and topdressing, and showed a steady downward trend with the advancement of spring wheat growth period. The contents of soil NO-3-N and NH+4-N among different treatments were the highest in N treatment. Correlation analysis showed that soil temperature, moisture and NH+4-N were the most significant factors affecting N2O emission under CK treatment.After fertilization, soil NO-3-N and NH+4-N were the dominant factors affecting soil N2O emissions, and correlation analysis showed that both were extremely significant positive correlations. In summary, fertilization had a greater impact on soil N2O emissions from dry\|fed spring wheat fields, and the response of soil N2O fluxes to temperature and water decreased after fertilization. On the other hand, compared with N and M treatments, MN treatment greatly improved crop yield without significantly increasing soil N2O emissions. Therefore, comprehensively considering N2O emissions and crop yield, MN treatment was the best fertilization method in semi\|arid areas of the Loess Plateau. |
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