| Characteristics of N2O emissions from different fertilization treatments in Weibei dryland apple orchard |
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| DOI：10.7606/j.issn.1000-7601.2020.01.08 |
| Key Words: N2O emission nitrogen reduction and fertilization organic fertilizer substitution apple orchard |
| Author Name | Affiliation | | ZHU Zhijun | College of Resources and Environment, Northwest Agriculture and Forestry University,Yangling,Shaanxi 712100 | | YANG Lili | College of Resources and Environment, Northwest Agriculture and Forestry University,Yangling,Shaanxi 712100 | | FENG Tao | College of Resources and Environment, Northwest Agriculture and Forestry University,Yangling,Shaanxi 712100 | | TONG Yan’an | College of Resources and Environment, Northwest Agriculture and Forestry University,Yangling,Shaanxi 712100 |
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| Abstract: |
| Studying N2O emission characteristics of reducing chemical nitrogen (N) fertilizer and organic substitution in apple orchards under ecological conditions can provide data support for estimating regional N2O emissions in Weibei dry land. In this experiment, static box\|gas chromatography was used to monitor N2O emission flux under different fertilization systems in apple orchards in Weibei dryland for a period of one year (Oct. 2017-Oct. 2018). The results showed that the apple expansion period was the main period of N2O emission from apple orchards on Weibei dry plateau. The total annual cumulative N2O emission of each fertilization treatment was between 1.14 kg·hm-2 and 4.46 kg·hm-2. Compared with conventional fertilization treatment, the total N2O emission of optimized N reduction and organic\|inorganic combined fertilization treatments decreased by 43.3% and 42.6%, respectively. The annual emission coefficients of conventional high nitrogen, optimized N reduction, and organic\|inorganic combined treatments were 0.27%, 0.22%, and 0.22%, respectively. Temperature was the decisive factor limiting N2O emission from soil during apple maturity and expansion. After fertilization, with the passage of time, insufficient substrate concentration gradually became an important factor to limit N2O emission. Therefore, as the recommended fertilization mode for apple orchards, organic and inorganic fertilizers can significantly reduce N2O emission, and fertilization before rainfall can reduce N2O emission peak value. |
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